darkcomet | 75a46d0987010a6abc8f915218761cc11ac0739fa075f1b7d3c848581d35c45f

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
05/03/2024, 11:54

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General

Target
b4a35ae6dcceea6390769829b4e1506f.exe
Size 356KB
Sample240305-n2219sfa34
SHA256 75a46d0987010a6abc8f915218761cc11ac0739fa075f1b7d3c848581d35c45f
MD5 b4a35ae6dcceea6390769829b4e1506f
SHA1 6a09b9ffaaa273f9bf942905eaf5fb13c8aa3e54
SHA512 57f6f5a60a953326b89006eaf5e89b0027639a917812fdcd8541143b6b3628fa2bc496ac80f6a1b5f068596a685140bbcf2da94457d0656f95bfd487ae752c37
SSDEEP 6144:QSe7yGf3dAFkG01ATscdgidiNE6zwXeX8OPHkXZivSh+Ou83pBIq4fo8RXtvoa:QSex3dIh+ATscrACSwXeXu+S3uYhV8Rv
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\\OCX33.exe"	b4a35ae6dcceea6390769829b4e1506f.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	b4a35ae6dcceea6390769829b4e1506f.exe

Checks BIOS information in registry 2 TTPs 2 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	b4a35ae6dcceea6390769829b4e1506f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	OCX33.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation	b4a35ae6dcceea6390769829b4e1506f.exe

Executes dropped EXE 1 IoCs

pid	Process
3492	OCX33.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-1-5-21-3270530367-132075249-2153716227-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OCX33 = "C:\\Windupdt\\OCX33.exe"	b4a35ae6dcceea6390769829b4e1506f.exe

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 8 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\ProcessorNameString	OCX33.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	OCX33.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	OCX33.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	b4a35ae6dcceea6390769829b4e1506f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	b4a35ae6dcceea6390769829b4e1506f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	b4a35ae6dcceea6390769829b4e1506f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	b4a35ae6dcceea6390769829b4e1506f.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	OCX33.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	b4a35ae6dcceea6390769829b4e1506f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	OCX33.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeSecurityPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeTakeOwnershipPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeLoadDriverPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeSystemProfilePrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeSystemtimePrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeProfSingleProcessPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeIncBasePriorityPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeCreatePagefilePrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeBackupPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeRestorePrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeShutdownPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeDebugPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeSystemEnvironmentPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeChangeNotifyPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeRemoteShutdownPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeUndockPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeManageVolumePrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeImpersonatePrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeCreateGlobalPrivilege	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: 33	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: 34	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: 35	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: 36	212	b4a35ae6dcceea6390769829b4e1506f.exe
Token: SeIncreaseQuotaPrivilege	3492	OCX33.exe
Token: SeSecurityPrivilege	3492	OCX33.exe
Token: SeTakeOwnershipPrivilege	3492	OCX33.exe
Token: SeLoadDriverPrivilege	3492	OCX33.exe
Token: SeSystemProfilePrivilege	3492	OCX33.exe
Token: SeSystemtimePrivilege	3492	OCX33.exe
Token: SeProfSingleProcessPrivilege	3492	OCX33.exe
Token: SeIncBasePriorityPrivilege	3492	OCX33.exe
Token: SeCreatePagefilePrivilege	3492	OCX33.exe
Token: SeBackupPrivilege	3492	OCX33.exe
Token: SeRestorePrivilege	3492	OCX33.exe
Token: SeShutdownPrivilege	3492	OCX33.exe
Token: SeDebugPrivilege	3492	OCX33.exe
Token: SeSystemEnvironmentPrivilege	3492	OCX33.exe
Token: SeChangeNotifyPrivilege	3492	OCX33.exe
Token: SeRemoteShutdownPrivilege	3492	OCX33.exe
Token: SeUndockPrivilege	3492	OCX33.exe
Token: SeManageVolumePrivilege	3492	OCX33.exe
Token: SeImpersonatePrivilege	3492	OCX33.exe
Token: SeCreateGlobalPrivilege	3492	OCX33.exe
Token: 33	3492	OCX33.exe
Token: 34	3492	OCX33.exe
Token: 35	3492	OCX33.exe
Token: 36	3492	OCX33.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 212 wrote to memory of 2504	212	b4a35ae6dcceea6390769829b4e1506f.exe	89
PID 212 wrote to memory of 2504	212	b4a35ae6dcceea6390769829b4e1506f.exe	89
PID 212 wrote to memory of 2504	212	b4a35ae6dcceea6390769829b4e1506f.exe	89
PID 212 wrote to memory of 3492	212	b4a35ae6dcceea6390769829b4e1506f.exe	91
PID 212 wrote to memory of 3492	212	b4a35ae6dcceea6390769829b4e1506f.exe	91
PID 212 wrote to memory of 3492	212	b4a35ae6dcceea6390769829b4e1506f.exe	91
PID 3492 wrote to memory of 1380	3492	OCX33.exe	92
PID 3492 wrote to memory of 1380	3492	OCX33.exe	92
PID 3492 wrote to memory of 1380	3492	OCX33.exe	92

C:\Users\Admin\AppData\Local\Temp\b4a35ae6dcceea6390769829b4e1506f.exe
"C:\Users\Admin\AppData\Local\Temp\b4a35ae6dcceea6390769829b4e1506f.exe"
1⤵
- Modifies WinLogon for persistence
- Drops file in Drivers directory
- Checks BIOS information in registry
- Checks computer location settings
- 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:212
- C:\Windows\SysWOW64\explorer.exe
  "C:\Windows\SysWOW64\explorer.exe"
  2⤵
  PID:2504
- C:\Windupdt\OCX33.exe
  "C:\Windupdt\OCX33.exe"
  2⤵
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3492
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    PID:1380

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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OCX33.exe

Path C:\Windupdt\OCX33.exe
Size 356KB
SHA256 75a46d0987010a6abc8f915218761cc11ac0739fa075f1b7d3c848581d35c45f
MD5 b4a35ae6dcceea6390769829b4e1506f
SHA1 6a09b9ffaaa273f9bf942905eaf5fb13c8aa3e54
SHA512 57f6f5a60a953326b89006eaf5e89b0027639a917812fdcd8541143b6b3628fa2bc496ac80f6a1b5f068596a685140bbcf2da94457d0656f95bfd487ae752c37
SSDEEP 6144:QSe7yGf3dAFkG01ATscdgidiNE6zwXeX8OPHkXZivSh+Ou83pBIq4fo8RXtvoa:QSex3dIh+ATscrACSwXeXu+S3uYhV8Rv
MD5 SHA1 SHA512 SSDEEP

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memory/212-0-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/212-1-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/212-2-0x00000000022F0000-0x00000000022F1000-memory.dmp

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memory/212-13-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-19-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-23-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-16-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-17-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-18-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-14-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-20-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-21-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-22-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-15-0x0000000002170000-0x0000000002171000-memory.dmp

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memory/3492-24-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-25-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-26-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-27-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-28-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-29-0x0000000000400000-0x00000000004B9000-memory.dmp

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memory/3492-30-0x0000000000400000-0x00000000004B9000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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