darkcomet | cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e

General

Target

cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe
Size

1.3MB
MD5

5af2b36bdf6590fc19fc5b9bc448798c
SHA1

95d5c284304adffb6612d6f541815d94ae0039eb
SHA256

cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e
SHA512

8220e0f86c1a84f4d4400dbf0401c5115d4419d3fd5883dba2261c34131061fda4d089a369becb858c2038b6327c2fa824112fbfe092874b606994db5e2c8112
SSDEEP

24576:voaA9jpW49EjGUxyM5S7jhrKdVPGQP17H6/VHWlugkviBFG+bMNtEr0Aoo6:voaw5AZ564/VlaATbxoL

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

T1004

Modify Registry

T1112

Processes:

vbc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Updater"	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

Processes:

vbc.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate vbc.exe
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	vbc.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

vbc.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run\Updater = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Updater"	vbc.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run	vbc.exe

Drops autorun.inf file 1 TTPs 4 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

Processes:

cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe

description	ioc	process
File created	C:\autorun.inf	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe
File opened for modification	C:\autorun.inf	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe
File created	D:\autorun.inf	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe
File opened for modification	D:\autorun.inf	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe

description	pid	process	target process
PID 1044 set thread context of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe

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

Processes:

vbc.exe

description	ioc	process
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
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	vbc.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

vbc.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier vbc.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	vbc.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

Processes:

vbc.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	1352	vbc.exe
Token: SeSecurityPrivilege	1352	vbc.exe
Token: SeTakeOwnershipPrivilege	1352	vbc.exe
Token: SeLoadDriverPrivilege	1352	vbc.exe
Token: SeSystemProfilePrivilege	1352	vbc.exe
Token: SeSystemtimePrivilege	1352	vbc.exe
Token: SeProfSingleProcessPrivilege	1352	vbc.exe
Token: SeIncBasePriorityPrivilege	1352	vbc.exe
Token: SeCreatePagefilePrivilege	1352	vbc.exe
Token: SeBackupPrivilege	1352	vbc.exe
Token: SeRestorePrivilege	1352	vbc.exe
Token: SeShutdownPrivilege	1352	vbc.exe
Token: SeDebugPrivilege	1352	vbc.exe
Token: SeSystemEnvironmentPrivilege	1352	vbc.exe
Token: SeChangeNotifyPrivilege	1352	vbc.exe
Token: SeRemoteShutdownPrivilege	1352	vbc.exe
Token: SeUndockPrivilege	1352	vbc.exe
Token: SeManageVolumePrivilege	1352	vbc.exe
Token: SeImpersonatePrivilege	1352	vbc.exe
Token: SeCreateGlobalPrivilege	1352	vbc.exe
Token: 33	1352	vbc.exe
Token: 34	1352	vbc.exe
Token: 35	1352	vbc.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exevbc.exe

description	pid	process	target process
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1044 wrote to memory of 1352	1044	cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe	vbc.exe
PID 1352 wrote to memory of 1836	1352	vbc.exe	explorer.exe
PID 1352 wrote to memory of 1836	1352	vbc.exe	explorer.exe
PID 1352 wrote to memory of 1836	1352	vbc.exe	explorer.exe
PID 1352 wrote to memory of 1836	1352	vbc.exe	explorer.exe

C:\Users\Admin\AppData\Local\Temp\cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe
"C:\Users\Admin\AppData\Local\Temp\cf98f5f40e09f782cb438b97d91596004cbb6754875ddb78990b89067d5b9b5e.exe"
1⤵
- Drops autorun.inf file
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1044
- 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
  - 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:1352
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    PID:1836

Network

MITRE ATT&CK Enterprise v6

Initial Access

Replication Through Removable Media

1

T1091

Execution

Scripting

1

T1064

Persistence

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Privilege Escalation

Defense Evasion

Modify Registry

Scripting

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Replication Through Removable Media

1

T1091

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1044-54-0x0000000075071000-0x0000000075073000-memory.dmp

Filesize
8KB

Download
memory/1044-55-0x0000000073F70000-0x000000007451B000-memory.dmp

Filesize
5.7MB

Download
memory/1044-76-0x0000000073F70000-0x000000007451B000-memory.dmp

Filesize
5.7MB

Download
memory/1352-66-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-70-0x000000000048E85C-mapping.dmp

Download
memory/1352-61-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-63-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-65-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-57-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-68-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-59-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-69-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-71-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-73-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-74-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-75-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/1352-56-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads