darkcomet | fe43a5c92229906e8817b08719aad04bd72a5ab4c81a62d970ebf5d92efe5c40

General

Target
3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Size 800KB
Sample240712-28eq7sxcld
SHA256 fe43a5c92229906e8817b08719aad04bd72a5ab4c81a62d970ebf5d92efe5c40
MD5 3f419af1c11e94f470b3985f5af994d1
SHA1 39ad1e9218b2b1d937e75d878eedfb035c194734
SHA512 731842b2ae7e4c08274138f55b975a54b83f3fac48ed6a7fe82669d2e1272cd5b98ea9f7843f0a6e0b08ff7166d0e99b600104c2e8bfb1ae582e9f8f65ec5442
SSDEEP 24576:8HKFontqGp6q+3Am4B/yW4di61muZcAppXlO80JCYDrGux7:8HKFon36sBgi61muZVJlOptPtx7
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

darkcomet persistence rat trojan

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

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\Windupdt\\winupdate.exe"	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Checks BIOS information in registry 2 TTPs 1 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1176886754-713327781-2233697964-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windows\\system32\\Windupdt\\winupdate.exe"	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Windupdt\winupdate.exe	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\Windupdt\winupdate.exe	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\Windupdt\	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2692 set thread context of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 4492 set thread context of 2972	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	87

Checks processor information in registry 2 TTPs 4 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeSecurityPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeTakeOwnershipPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeLoadDriverPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeSystemProfilePrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeSystemtimePrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeProfSingleProcessPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeIncBasePriorityPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeCreatePagefilePrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeBackupPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeRestorePrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeShutdownPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeDebugPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeSystemEnvironmentPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeChangeNotifyPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeRemoteShutdownPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeUndockPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeManageVolumePrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeImpersonatePrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: SeCreateGlobalPrivilege	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: 33	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: 34	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: 35	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
Token: 36	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
2972	explorer.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 2692 wrote to memory of 4492	2692	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	86
PID 4492 wrote to memory of 2972	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	87
PID 4492 wrote to memory of 2972	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	87
PID 4492 wrote to memory of 2972	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	87
PID 4492 wrote to memory of 2972	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	87
PID 4492 wrote to memory of 2972	4492	3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe	87
PID 2972 wrote to memory of 100	2972	explorer.exe	88
PID 2972 wrote to memory of 100	2972	explorer.exe	88
PID 2972 wrote to memory of 100	2972	explorer.exe	88

C:\Users\Admin\AppData\Local\Temp\3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2692
- C:\Users\Admin\AppData\Local\Temp\3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
  C:\Users\Admin\AppData\Local\Temp\3f419af1c11e94f470b3985f5af994d1_JaffaCakes118.exe
  2⤵
  - Modifies WinLogon for persistence
  - Checks BIOS information in registry
  - Adds Run key to start application
  - Drops file in System32 directory
  - Suspicious use of SetThreadContext
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4492
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2972
  - - C:\Windows\SysWOW64\explorer.exe
      C:\Windows\SysWOW64\explorer.exe
      4⤵
      PID:100