darkcomet | 5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

Resubmissions

14-04-2022 12:59

220414-p8a2sshebl 10

29-06-2021 08:03

210629-akz5ha9y3n 10

Analysis

max time kernel
150s
max time network
152s
platform
windows7_x64
resource
win7v20210410
submitted
29-06-2021 08:03

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General

Target

opengl installer.exe
Size

252KB
MD5

ad987dd8602b2b78090a08f73212a7a0
SHA1

4cc227c83d1403a29c2f68ef0afe12725e0dc996
SHA256

5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360
SHA512

248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Score

10^/10

darkcomet evasion persistence rat trojan upx

Malware Config

Signatures

Darkcomet
DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.
trojan rat darkcomet

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

opengl installer.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\AppData\\Local\\Temp\\Microsoft\\msdcsc.exe"	opengl installer.exe

Disables RegEdit via registry modification
evasion

Executes dropped EXE 1 IoCs

Processes:

msdcsc.exe

pid	Process
1176	msdcsc.exe

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral1/files/0x00040000000130ef-60.dat	upx
behavioral1/files/0x00040000000130ef-61.dat	upx
behavioral1/files/0x00040000000130ef-63.dat	upx
behavioral1/files/0x00040000000130ef-65.dat	upx
behavioral1/files/0x00040000000130ef-66.dat	upx
behavioral1/files/0x00040000000130ef-68.dat	upx
behavioral1/files/0x00040000000130ef-67.dat	upx

Loads dropped DLL 5 IoCs

Processes:

opengl installer.exemsdcsc.exe

pid	Process
1096	opengl installer.exe
1096	opengl installer.exe
1176	msdcsc.exe
1176	msdcsc.exe
1176	msdcsc.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

opengl installer.exemsdcsc.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Microsoft\\msdcsc.exe"	opengl installer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Microsoft\\msdcsc.exe"	msdcsc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 48 IoCs

Processes:

opengl installer.exemsdcsc.exe

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1096	opengl installer.exe
Token: SeSecurityPrivilege	1096	opengl installer.exe
Token: SeTakeOwnershipPrivilege	1096	opengl installer.exe
Token: SeLoadDriverPrivilege	1096	opengl installer.exe
Token: SeSystemProfilePrivilege	1096	opengl installer.exe
Token: SeSystemtimePrivilege	1096	opengl installer.exe
Token: SeProfSingleProcessPrivilege	1096	opengl installer.exe
Token: SeIncBasePriorityPrivilege	1096	opengl installer.exe
Token: SeCreatePagefilePrivilege	1096	opengl installer.exe
Token: SeBackupPrivilege	1096	opengl installer.exe
Token: SeRestorePrivilege	1096	opengl installer.exe
Token: SeShutdownPrivilege	1096	opengl installer.exe
Token: SeDebugPrivilege	1096	opengl installer.exe
Token: SeSystemEnvironmentPrivilege	1096	opengl installer.exe
Token: SeChangeNotifyPrivilege	1096	opengl installer.exe
Token: SeRemoteShutdownPrivilege	1096	opengl installer.exe
Token: SeUndockPrivilege	1096	opengl installer.exe
Token: SeManageVolumePrivilege	1096	opengl installer.exe
Token: SeImpersonatePrivilege	1096	opengl installer.exe
Token: SeCreateGlobalPrivilege	1096	opengl installer.exe
Token: 33	1096	opengl installer.exe
Token: 34	1096	opengl installer.exe
Token: 35	1096	opengl installer.exe
Token: SeIncreaseQuotaPrivilege	1176	msdcsc.exe
Token: SeSecurityPrivilege	1176	msdcsc.exe
Token: SeTakeOwnershipPrivilege	1176	msdcsc.exe
Token: SeLoadDriverPrivilege	1176	msdcsc.exe
Token: SeSystemProfilePrivilege	1176	msdcsc.exe
Token: SeSystemtimePrivilege	1176	msdcsc.exe
Token: SeProfSingleProcessPrivilege	1176	msdcsc.exe
Token: SeIncBasePriorityPrivilege	1176	msdcsc.exe
Token: SeCreatePagefilePrivilege	1176	msdcsc.exe
Token: SeBackupPrivilege	1176	msdcsc.exe
Token: SeRestorePrivilege	1176	msdcsc.exe
Token: SeShutdownPrivilege	1176	msdcsc.exe
Token: SeDebugPrivilege	1176	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	1176	msdcsc.exe
Token: SeChangeNotifyPrivilege	1176	msdcsc.exe
Token: SeRemoteShutdownPrivilege	1176	msdcsc.exe
Token: SeUndockPrivilege	1176	msdcsc.exe
Token: SeManageVolumePrivilege	1176	msdcsc.exe
Token: SeImpersonatePrivilege	1176	msdcsc.exe
Token: SeCreateGlobalPrivilege	1176	msdcsc.exe
Token: 33	1176	msdcsc.exe
Token: 34	1176	msdcsc.exe
Token: 35	1176	msdcsc.exe
Token: SeRestorePrivilege	1096	opengl installer.exe
Token: SeBackupPrivilege	1096	opengl installer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

msdcsc.exe

pid	Process
1176	msdcsc.exe

Suspicious use of WriteProcessMemory 33 IoCs

Processes:

opengl installer.exemsdcsc.exe

description	pid	Process	procid_target
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1096 wrote to memory of 1176	1096	opengl installer.exe	26
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27
PID 1176 wrote to memory of 1144	1176	msdcsc.exe	27

C:\Users\Admin\AppData\Local\Temp\opengl installer.exe
"C:\Users\Admin\AppData\Local\Temp\opengl installer.exe"
1⤵
- Modifies WinLogon for persistence
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1096
- C:\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe
  "C:\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1176
- - C:\Windows\SysWOW64\notepad.exe
    notepad
    3⤵
    PID:1144

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
C:\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
\Users\Admin\AppData\Local\Temp\Microsoft\msdcsc.exe

MD5
ad987dd8602b2b78090a08f73212a7a0

SHA1
4cc227c83d1403a29c2f68ef0afe12725e0dc996

SHA256
5a2ab897c8f8d779118f7e29f018796913274a8e6d7d815955c028bd9a576360

SHA512
248f94693dd0ee2514f900a1d68356179e971c29ca625fb499aab6dc7767dedcf452dfa9ccc571c06cb2cbdd32798d7451bbc4a917014b5147e22ffdec3bd47d

Download Submit
memory/1096-59-0x0000000075561000-0x0000000075563000-memory.dmp

Filesize
8KB

Download
memory/1096-71-0x0000000000270000-0x0000000000271000-memory.dmp

Filesize
4KB

Download
memory/1144-69-0x0000000000000000-mapping.dmp

Download
memory/1144-73-0x0000000000210000-0x0000000000211000-memory.dmp

Filesize
4KB

Download
memory/1176-62-0x0000000000000000-mapping.dmp

Download
memory/1176-72-0x0000000000230000-0x00000000002E7000-memory.dmp

Filesize
732KB

Download