darkcomet | e2836933aa101819ccfd534a7f7565f68e7254925a6060372f4b83f5bf02ed09

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20240215-en
resource tags

arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
submitted
10/03/2024, 02:50

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General

Target
bd7a6bf0253107186d2858468410e492.exe
Size 1.2MB
Sample240310-dbs1kabb21
SHA256 e2836933aa101819ccfd534a7f7565f68e7254925a6060372f4b83f5bf02ed09
MD5 bd7a6bf0253107186d2858468410e492
SHA1 d99cd5047d7dbd3a8286d3d5dce5d55cfc961d1e
SHA512 56b31cf452c4e03d08d7b9eebd97a4123d6b1b0887bd420de0da27fe07d9476d4305b91c8accef6c4c6e2c85b1f69a22e31b6dd2ca2182481fc24891608bc9cf
SSDEEP 24576:eSg5ZDiPWS1k3U2IIji1Nh6i5iyFsuU0o8:JShR3Hji/
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:\\Windupdt\\winupdate.exe"	vbc.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	vbc.exe

Executes dropped EXE 1 IoCs

pid	Process
2476	winupdate.exe

Loads dropped DLL 1 IoCs

pid	Process
2132	vbc.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Login Module = "C:\\ProgramData\\winloggon.exe"	bd7a6bf0253107186d2858468410e492.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe"	vbc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2028 set thread context of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28

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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	vbc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	vbc.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	vbc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	vbc.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	vbc.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2132	vbc.exe
Token: SeSecurityPrivilege	2132	vbc.exe
Token: SeTakeOwnershipPrivilege	2132	vbc.exe
Token: SeLoadDriverPrivilege	2132	vbc.exe
Token: SeSystemProfilePrivilege	2132	vbc.exe
Token: SeSystemtimePrivilege	2132	vbc.exe
Token: SeProfSingleProcessPrivilege	2132	vbc.exe
Token: SeIncBasePriorityPrivilege	2132	vbc.exe
Token: SeCreatePagefilePrivilege	2132	vbc.exe
Token: SeBackupPrivilege	2132	vbc.exe
Token: SeRestorePrivilege	2132	vbc.exe
Token: SeShutdownPrivilege	2132	vbc.exe
Token: SeDebugPrivilege	2132	vbc.exe
Token: SeSystemEnvironmentPrivilege	2132	vbc.exe
Token: SeChangeNotifyPrivilege	2132	vbc.exe
Token: SeRemoteShutdownPrivilege	2132	vbc.exe
Token: SeUndockPrivilege	2132	vbc.exe
Token: SeManageVolumePrivilege	2132	vbc.exe
Token: SeImpersonatePrivilege	2132	vbc.exe
Token: SeCreateGlobalPrivilege	2132	vbc.exe
Token: 33	2132	vbc.exe
Token: 34	2132	vbc.exe
Token: 35	2132	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2028 wrote to memory of 2132	2028	bd7a6bf0253107186d2858468410e492.exe	28
PID 2132 wrote to memory of 872	2132	vbc.exe	29
PID 2132 wrote to memory of 872	2132	vbc.exe	29
PID 2132 wrote to memory of 872	2132	vbc.exe	29
PID 2132 wrote to memory of 872	2132	vbc.exe	29
PID 2132 wrote to memory of 2476	2132	vbc.exe	30
PID 2132 wrote to memory of 2476	2132	vbc.exe	30
PID 2132 wrote to memory of 2476	2132	vbc.exe	30
PID 2132 wrote to memory of 2476	2132	vbc.exe	30
PID 2132 wrote to memory of 2476	2132	vbc.exe	30
PID 2132 wrote to memory of 2476	2132	vbc.exe	30
PID 2132 wrote to memory of 2476	2132	vbc.exe	30

C:\Users\Admin\AppData\Local\Temp\bd7a6bf0253107186d2858468410e492.exe
"C:\Users\Admin\AppData\Local\Temp\bd7a6bf0253107186d2858468410e492.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2028
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Modifies WinLogon for persistence
  - Checks BIOS information in registry
  - Loads dropped DLL
  - Adds Run key to start application
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2132
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    PID:872
- - C:\Windupdt\winupdate.exe
    "C:\Windupdt\winupdate.exe"
    3⤵
    - Executes dropped EXE
    PID:2476

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

T1064

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Scripting

T1064

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

winupdate.exe

Path C:\Windupdt\winupdate.exe
Size 1.1MB
SHA256 6df94b7fa33f1b87142adc39b3db0613fc520d9e7a5fd6a5301dd7f51f8d0386
MD5 34aa912defa18c2c129f1e09d75c1d7e
SHA1 9c3046324657505a30ecd9b1fdb46c05bde7d470
SHA512 d1ea9368f5d7166180612fd763c87afb647d088498887961f5e7fb0a10f4a808bd5928e8a3666d70ff794093c51ecca8816f75dd47652fd4eb23dce7f9aa1f98
SSDEEP 24576:3xAZ7O8RoJUlKxkSgg2fjyqd3sz6iWIV78Ka//XJRUGsqUyJfIxv048qZZT:gO8Rb37gDq6cXJaGJ2xv0IZ
MD5 SHA1 SHA512 SSDEEP

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memory/2028-0-0x0000000074AE0000-0x000000007508B000-memory.dmp

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memory/2028-1-0x0000000074AE0000-0x000000007508B000-memory.dmp

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memory/2028-2-0x0000000000390000-0x00000000003D0000-memory.dmp

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memory/2028-22-0x0000000074AE0000-0x000000007508B000-memory.dmp

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memory/2132-15-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-16-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-11-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-12-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-10-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-9-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/2132-7-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-8-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-18-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-21-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-5-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-24-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-23-0x0000000000280000-0x0000000000281000-memory.dmp

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memory/2132-3-0x0000000000400000-0x00000000004B8000-memory.dmp

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memory/2132-32-0x0000000000400000-0x00000000004B8000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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