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SolarWinds SunBurst Countermeasures

Block DLLs mentioned in MSRC Guidance from Loading.

For guidance on the solarwinds issue please see DHS, SolarWinds, FireEYE, MSRC, CrowdStrike and Microsoft.

Advanced users, please see the FireEYE repo on this issue.

SANS has a good video on the topic here.

Executables:

The DLL in question is SolarWinds.Orion.Core.BusinessLayer.dll and was signed as a ligitimate part of the SolarWinds suite, bypassing application control technologies. It is installed as a service.

The malicious code was injected into a legitimate DLL and is loaded into memory when the application runs. The code runs before the legitimate code. According to Microsoft, the code is activated when SolarWinds.BusinessLayerHost.exe executable runs, but may the following may also load it:

  • ConfigurationWizard.exe
  • NetflowDatabaseMaintenance.exe
  • NetFlowService.exe
  • SolarWinds.Administration.exe
  • SolarWinds.BusinessLayerHost.exe
  • SolarWinds.Collector.Service.exe
  • SolarwindsDiagnostics.exe

Network information:

General Ranges:

  • DNS CNAMEs for C2:
    • .appsync-api.eu-west-1[.]avsvmcloud[.]com
    • .appsync-api.us-west-2[.]avsvmcloud[.]com
    • .appsync-api.us-east-1[.]avsvmcloud[.]com
    • .appsync-api.us-east-2[.]avsvmcloud[.]com
  • IP Ranges for C2:
    • 20.140.0.0/15
    • 96.31.172.0/24
    • 131.228.12.0/22
    • 144.86.226.0/24

Specifically Identified:

  • DNS Names associated with C2:
    • List from Bambenek
    • 6a57jk2ba1d9keg15cbg.appsync-api.eu-west-1.avsvmcloud[.]com
    • 7sbvaemscs0mc925tb99.appsync-api.us-west-2.avsvmcloud[.]com
    • gq1h856599gqh538acqn.appsync-api.us-west-2.avsvmcloud[.]com
    • ihvpgv9psvq02ffo77et.appsync-api.us-east-2.avsvmcloud[.]com
    • k5kcubuassl3alrf7gm3.appsync-api.eu-west-1.avsvmcloud[.]com
    • mhdosoksaccf9sni9icp.appsync-api.eu-west-1.avsvmcloud[.]com
    • vincentolife[.]com/j
  • IPs assosciated with C2:
    • 13.59.205.66
    • 54.193.127.66
    • 54.215.192.52
    • 34.203.203.23
    • 139.99.115.204
    • 5.252.177.25
    • 5.252.177.21
    • 204.188.205.176
    • 51.89.125.18
    • 167.114.213.199
    • 45.135.232.131
  • C:\Program Files (x86)\N-able Technologies\Windows Software Probe\bin\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\Solarwinds\Network Topology Mapper\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\Solarwinds\Network Topology Mapper\Service\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\DPI\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\NCM\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\Interfaces.Discovery\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\DPA\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\HardwareHealth\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\Interfaces\SolarWinds.Orion.Core.BusinessLayer.dl
  • C:\Program Files (x86)\SolarWinds\Orion\NetFlowTrafficAnalysis\SolarWinds.Orion.Core.BusinessLayer.dll
  • C:\Program Files (x86)\SolarWinds\Orion\NPM\SolarWinds.Orion.Core.BusinessLayer.dll

Microsoft Malicious DLL Table:

SHA256 File Version Date first seen
32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77 2019.4.5200.9083 March 2020
dab758bf98d9b36fa057a66cd0284737abf89857b73ca89280267ee7caf62f3b 2020.2.100.12219 March 2020
eb6fab5a2964c5817fb239a7a5079cabca0a00464fb3e07155f28b0a57a2c0ed 2020.2.100.11831 March 2020
c09040d35630d75dfef0f804f320f8b3d16a481071076918e9b236a321c1ea77 Not available March 2020
ac1b2b89e60707a20e9eb1ca480bc3410ead40643b386d624c5d21b47c02917c 2020.4.100.478 April 2020
019085a76ba7126fff22770d71bd901c325fc68ac55aa743327984e89f4b0134 2020.2.5200.12394 April 2020
ce77d116a074dab7a22a0fd4f2c1ab475f16eec42e1ded3c0b0aa8211fe858d6 2020.2.5300.12432 May 2020
a25cadd48d70f6ea0c4a241d99c5241269e6faccb4054e62d16784640f8e53bc 2019.4.5200.8890 October 2019
d3c6785e18fba3749fb785bc313cf8346182f532c59172b69adfb31b96a5d0af 2019.4.5200.8890 October 2019

FireEYE Indicator Table:

SHA256 SHA1 MD5 FILENAME MIME Malware Family Role
d0d626deb3f9484e649294a8dfa814c5568f846d5aa02d4cdad5d041a29d5600 1b476f58ca366b54f34d714ffce3fd73cc30db1a 02af7cec58b9a5da1c542b5a32151ba1 CORE-2019.4.5220.20574-SolarWinds-Core-v2019.4.5220-Hotfix5.msp application/vnd.ms-office SUNBURST Installer
53f8dfc65169ccda021b72a62e0c22a4db7c4077f002fa742717d41b3c40f2c7 47d92d49e6f7f296260da1af355f941eb25360c4 08e35543d6110ed11fdf558bb093d401 Solarwinds Worldwide, LLC application/x-x509-server-cert Code Signing Certificate Legitimate SolarWinds code-signing certificate
019085a76ba7126fff22770d71bd901c325fc68ac55aa743327984e89f4b0134 2f1a5a7411d015d01aaee4535835400191645023 2c4a910a1299cdae2a4e55988a2f102e SolarWinds.Orion.Core.BusinessLayer.dll application/x-dosexec SUNBURST backdoor
ce77d116a074dab7a22a0fd4f2c1ab475f16eec42e1ded3c0b0aa8211fe858d6 d130bd75645c2433f88ac03e73395fba172ef676 846e27a652a5e1bfbd0ddd38a16dc865 SolarWinds.Orion.Core.BusinessLayer.dll application/x-dosexec SUNBURST backdoor
32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77 76640508b1e7759e548771a5359eaed353bf1eec b91ce2fa41029f6955bff20079468448 SolarWinds.Orion.Core.BusinessLayer.dll application/x-dosexec SUNBURST backdoor
292327e5c94afa352cc5a02ca273df543f2020d0e76368ff96c84f4e90778712 c2c30b3a287d82f88753c85cfb11ec9eb1466bad 4f2eb62fa529c0283b28d05ddd311fae OrionImprovementBusinessLayer.2.cs text/plain SUNBURST Decompiled and corrected source code for SUNBURST
c15abaf51e78ca56c0376522d699c978217bf041a3bd3c71d09193efa5717c71

CroudStrike

SolarMarker Indicator Table:

Description Path if applicable SHA256 hash if applicable
Second stage %Temp%<random chars>.txt Changes due to randomly generated path to third stage it contains
Encrypted third stage %Temp%<random chars>.txt e82a58e59321852c6857aa511472cbb7327822461a03e3c189304b2c36f17273
Third stage None 2860a7b98dbfc4c10347187e79d7528a875dd71a893ce025190b57bcb1bcc0f0
Fourth stage %AppData%\microsoft<RND4><RND8>.cmd Changes due to randomly generated paths it contains
Encrypted backdoor None b3e6a879d4ac3fff34b520f39994639df26e846087632fb7505e89a4da220868
Base64-decoded backdoor %AppData%\microsoft<RND4><RND52> 45ea9b5697517f7bdc5af83c62bb8de7821baef9463c466cfc0e881f21c32011
Backdoor None ceb42fea3be898251028e2c5128a69451212bcb48a4871454c60dc2262426677
SolarMarker Stealer first stage %Temp%<RND24>.ps1 2a8bc51367801c87ca2c64fdad1d0b06f91bbbc4f0f16ad18dbc122fda3d1a87
SolarMarker Stealer None ce486097ad2491aba8b1c120f6d0aa23eaf59cf698b57d2113faab696d03c601
Victim ID %userprofile%\AppData\Roaming\solarmarker.dat Changes due to randomly generated content

SolarMarker Network Table:

Description C2
SolarMarker Backdoor C2 http[:]//45.135.232[.]131
SolarMarker Stealer C2 https[:]//vincentolife[.]com/j

Sites Known to Be Hit By SunBurst/SolarFlare:

https://github.com/RedDrip7/SunBurst_DGA_Decode

https://pastebin.com/raw/6NukuxBN

.gh
ad001.mtk.lo
isi
belkin.com
gncu.local
gncu.local
csnt.princegeor
gncu.local
sm-group.local
ville.terrebonn
corp.ptci.com
ah.org
spsd.sk.ca
spsd.sk.ca
its.iastate.ed
gncu.local
0fz
sbywx3
prod.hamilton.
WASHO
WASHO
camcity.local
c4e-internal.c
COWI.
amr.corp.intel
amr.corp.intel
vms.ad.varian
seattle.interna
SCMRI
ah.org
woodruff-sawyer
wfhf1.hewlett.
ad.optimizely.
aerioncorp.com
camcity.local
ah.org
ah.org
ah.org
its.iastate.ed
ad.optimizely.
3jz
WASHO
Centr
vms.ad.varian
glu.com
y9k.in
ib_
gncu.local
csnt.princegeor
spsd.sk.ca
spsd.sk.ca
gncu.local
vms.ad.varian
osb.local
cow.local
its.iastate.ed
its.iastate.ed
cds.capilanou.
spsd.sk.ca
dotcomm.org
nswhealth.net
servitia.intern
sc.pima.gov
csnt.princegeor
bok.com
cow.local
cow.local
9j7
vms.ad.varian
mixonhill.com
mixonhill.com
its.iastate.ed
FSAR.
grupobazar.loca
gncu.local
ad.optimizely.
wfhf1.hewlett.
WASHO
pqcorp.com
vms.ad.varian
WASHO
ah.org
_ka7du
internal.jtl.c
ah.org
its.iastate.ed
.com
cds.capilanou.
vms.ad.varian
spsd.sk.ca
WASHO
mixonhill.com
vms.ad.varian
ah.org
hgvc.com
cds.capilanou.
fa.lcl
ah.org
bi.corp
cfsi.local
csa.local
vms.ad.varian
its.iastate.ed
amr.corp.intel
cow.local
its.iastate.ed
fa.lcl
its.iastate.ed
vms.ad.varian
vms.ad.varian
vms.ad.varian
csnt.princegeor
ftfcu.corp
xdxinc.net
gncu.local
ghsmain1.ggh.g
.sutmf
pi_
corp.stratusnet
cds.capilanou.
wfhf1.hewlett.
WASHO
e-idsolutions.
csnt.princegeor
dhhs-
amr.corp.intel
WASHO
vms.ad.varian
5ja
2k3
paloverde.local
ah.org
helixwater.org
ank.com
-jlowd
americas.phoeni
its.iastate.ed
spsd.sk.ca
amr.corp.intel
WASHO
orient-express
-gn
fremont.lamrc.
vms.ad.varian
vms.ad.varian
ingo.kg
aerioncorp.com
vms.ad.varian
its.iastate.ed
vms.ad.varian
prod.hamilton.
glu.com
ah.org
corp.stratusnet
yorkton.cofy
5h2uw.
bi.corp
vms.ad.varian
fa.lcl
ah.org
dhhs-
cow.local
spsd.sk.ca
tv2.local
corp.dvd.com
its.iastate.ed
its.iastate.ed
WASHO
prod.hamilton.
spsd.sk.ca
cys.local
its.iastate.ed
ehtuh-
ux7tt-
xijtt-
cow.local
8bb5tt
glu.com
WASHO
bcofsa.com.ar
detmir-group.r
dhhs-
spsd.sk.ca
calsb.org
dhhs-
bop.com.pk
its.iastate.ed
fisherbartoninc
vms.ad.varian
Ameri
spsd.sk.ca
jjc
vms.ad.varian
WASHO
gksm.local
fidelitycomm.lo
cow.local
prod.hamilton.
vms.ad.varian
banccentral.com
RALEY
.com
oslerhc.org
e-idsolutions.
glu.com
ah.org
q9owtt
itps.uk.net
coxnet.cox.com
wfhf1.hewlett.
ions.com
woodruff-sawyer
gksm.local
its.iastate.ed
rbe.sk.ca
dhhs-
cda.corp
ia.com
-wwgi2xnl
its.iastate.ed
7iezxb
glu.com
WASHO
prod.hamilton.
Broke
WASHO
taylorfarms.com
fa.lcl
tx.org
smes.org
fhc.local
spsd.sk.ca
cow.local
WASHO
ebe.co.roanoke
ah.org
sfsi.stearnsban
vms.ad.varian
vms.ad.varian
amr.corp.intel
WASHO
rccf.ru
dhhs-
_cqqri
newdirections.k
bop.com.pk
2hozhb
9h-
its.iastate.ed
vms.ad.varian
vms.ad.varian
vms.ad.varian
gncu.local
gncu.local
bi.corp
vms.ad.varian
spsd.sk.ca
WASHO
csnt.princegeor
neophotonics.co
spsd.sk.ca
-er7kj
fidelitycomm.lo
csa.local
csa.local
csa.local
csa.local
keyano.local
cow.local
amr.corp.intel
WASHO
inf.dc.net
int.lukoil-int
nswhealth.net
SF-Li
WASHO
vms.ad.varian
wfhf1.hewlett.
.il
ah.org
yorkton.cofy
gksm.local
casino.prv
ah.org
spsd.sk.ca
spsd.sk.ca
rst.atlantis-p
WASHO
csqsxh
ub_
spsd.sk.ca
its.iastate.ed
vms.ad.varian
csa.local
vms.ad.varian
scroot.com
moncton.loc
ks3
corp.stratusnet
k.com
int.lukoil-int
dhhs-
its.iastate.ed
ah.org
amr.corp.intel
inf.dc.net
spsd.sk.ca
WASHO
gloucesterva.ne
neophotonics.co
glu.com
csa.local
dskb2x
bop.com.pk
WASHO
csnt.princegeor
amr.corp.intel
_9kmqs27ujjc
rbe.sk.ca
WASHO
its.iastate.ed
spsd.sk.ca
spsd.sk.ca
ad.optimizely.
ah.org
amr.corp.intel
spsd.sk.ca
spsd.sk.ca
WASHO
SF-Li
vms.ad.varian
vms.ad.varian
csa.local
WASHO
WASHO
ecocorp.local
.com
innout.corp
chc.dom
cow.local
amr.corp.intel
its.iastate.ed
WASHO
c4e-internal.c
SCMRI
its.iastate.ed
.uoh8m
wfhf1.hewlett.
ah.org
gncu.local
magnoliaisd.loc
spsd.sk.ca
spsd.sk.ca
fa.lcl
-7n
cow.local
cosgroves.local
spsd.sk.ca
vms.ad.varian
csnt.princegeor
csnt.princegeor
prod.hamilton.
its.iastate.ed
its.iastate.ed
csnt.princegeor
gncu.local
spsd.sk.ca
WASHO
amr.corp.intel
nvidia.com
amalfi.local
kcpl.com
zippertubing.co
uis.kent.edu
ci.dublin.ca.
milledgeville.l
amr.corp.intel
dhhs-
camcity.local
HQ.RE
wfhf1.hewlett.
its.iastate.ed
ad.optimizely.
yorkton.cofy
ah.org
9
i9-
csa.local
vms.ad.varian
digitalreachinc
WASHO
.com
gncu.local
ad.library.ucl
WASHO
its.iastate.ed
CRIHB
MOC.l
ad.optimizely.
DPCIT
vms.ad.varian
SF-Li
yxw
fa.lcl
amr.corp.intel
ah.org
ad.optimizely.
its.iastate.ed
amr.corp.intel
its.iastate.ed
its.iastate.ed
dhhs-
sro.vestfor.dk
a.edu
corp.stratusnet
superior.local
aerioncorp.com
gyldendal.local
vms.ad.varian
WASHO
csa.local
cisco.com
siskiyous.edu
spsd.sk.ca
spsd.sk.ca
dhhs-
2h-xqf
thajxq
WASHO
gncu.local
bop.com.pk
mixonhill.com
deniz.denizbank
fidelitycomm.lo
ftfcu.corp
ad.azarthritis
cow.local
thoughtspot.int
ggsg-us.cisco
nvidia.com
its.iastate.ed
ad.azarthritis
-wwgi2xnl
gncu.local
spsd.sk.ca
csnt.princegeor
nzi_9p
bhq.lan
lufkintexas.net
WASHO
Samue
c4e-internal.c
vms.ad.varian
pcsco.com
aerioncorp.com
ta.org
WASHO
pe_
ville.terrebonn
vms.ad.varian
c4e-internal.c
WASHO
jxxyx.
spsd.sk.ca
spsd.sk.ca
vms.ad.varian
ftfcu.corp
ah.org
its.iastate.ed
sdch.local
coxnet.cox.com
cow.local
cow.local
í®LnÎ
net.vestfor.dk
prod.hamilton.
vms.ad.varian
vms.ad.varian
allegronet.co.
fa.lcl
corp.stingraydi
digitalsense.co
uis.kent.edu
sc.pima.gov
spsd.sk.ca
zu0
ies.com
csnt.princegeor
rccf.ru
KS.LO
wrbaustralia.ad
gncu.local
gncu.local
gncu.local
rbe.sk.ca
WASHO
detmir-group.r
gncu.local
vms.ad.varian
amr.corp.intel
csnt.princegeor
its.iastate.ed
tr.technion.ac
rs.local
csnt.princegeor
LABEL
christieclinic.
rbe.sk.ca
bk.local
ansc.gob.pe
WASHO
COWI.
WASHO
WASHO
admin.callidusc
corp.stratusnet
fa.lcl
its.iastate.ed
its.iastate.ed
amr.corp.intel
epl.com
csnt.princegeor
bop.com.pk
Sunki
htwanmgmt.local
-xhi7z
its.iastate.ed
camcity.local
prod.hamilton.
its.iastate.ed
its.iastate.ed
_kfczdhxejtgzy
mixonhill.com
WASHO
WASHO
nswhealth.net
WASHO
csnt.princegeor
-ka25u
fa.lcl
DCCAT
amr.corp.intel
amr.corp.intel
camcity.local
cow.local
fa.lcl
csnt.princegeor
cds.capilanou.
csa.local
WASHO
uzq
ah.org
Smart
mixonhill.com
SF-Li
corp.stratusnet
COTES
its.iastate.ed
corp.stratusnet
cds.capilanou.
vms.ad.varian
intensive.int
vms.ad.varian
cds.capilanou.
ah.org
lhc_2f
3if.2l
vms.ad.varian
its.iastate.ed
alm.brand.dk
ironform.com
camcity.local
BE.AJ
vms.ad.varian
CIMBM
its.iastate.ed
spsd.sk.ca
amr.corp.intel
WASHO
viam-invenient
amr.corp.intel
vms.ad.varian
gncu.local
020ie
cow.local
zeb.i8
amr.corp.intel
csnt.princegeor
nih.if
bi.corp
gncu.local
aerioncorp.com
vms.ad.varian
csa.local
vms.ad.varian
ad001.mtk.lo
prod.hamilton.
admin.callidusc
-jc5pe
gncu.local
WASHO
WASHO
dhhs-
yorkton.cofy
azlcyy
e9.2pz
ykz
SFBAL
mixonhill.com
camcity.local
Aeria
spsd.sk.ca
barrie.ca
.il
ak.ru
sc.pima.gov
1386-
ripta.com
sos-ad.state.
fa.lcl
int.lukoil-int
ABLE.
nvidia.com
its.iastate.ed
ah.org
corp.stratusnet
_yd55t
csa.local
aerioncorp.com
ah.org
corp.stratusnet
its.iastate.ed
scif.com
acmedctr.ad
prod.hamilton.
its.iastate.ed
csnt.princegeor
spsd.sk.ca
ville.terrebonn
cda.corp
kcpl.com
ou0yoy
mixonhill.com
mixonhill.com
fa.lcl
kcpl.com
ccscurriculum.c
on-pot
mnh.rg-law.ac
gncu.local
corp.stingraydi
cow.local
bi.corp
spsd.sk.ca
vms.ad.varian
uncity.dk
jxb3eh
spsd.sk.ca
gncu.local
2iqzth
nj_3357zllc
WASHO
ad.optimizely.
ah.org
wfhf1.hewlett.
sdch.local
csa.local
csa.local
coxnet.cox.com
vms.ad.varian
vms.ad.varian
publiser.it
vms.ad.varian
spsd.sk.ca
its.iastate.ed
corp.stratusnet
its.iastate.ed
int.lukoil-int
tx.org
woodruff-sawyer
0sb
amr.corp.intel
spsd.sk.ca
its.iastate.ed
its.iastate.ed
aerioncorp.com
its.iastate.ed
bop.com.pk
csnt.princegeor
7xu
its.iastate.ed
.ac.il
uont.com
prod.hamilton.
insead.org
vsp.com
spsd.sk.ca
dhhs-
ad.optimizely.
_ko
vms.ad.varian
WASHO
its.iastate.ed
DCCAT
its.iastate.ed
ni.corp.natins
cow.local
weioffice.com
gncu.local
amr.corp.intel
vms.ad.varian
dhhs-
aerioncorp.com
khi0kl
its.iastate.ed
DCCAT
corp.stratusnet
WASHO
rai.com
.ak
dhhs-
3n2_sz
nswhealth.net
aerioncorp.com
WASHO
csa.local
glu.com
3xz_se
nswhealth.net
WASHO
its.iastate.ed
ah.org
its.iastate.ed
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