darkcomet | 4a2b8775c52b3594c1e8889afdf96c1477853d5b912b3ede8248fa306da74bcd

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
22/07/2024, 16:38

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General

Target
63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe
Size 668KB
Sample240722-t5f6vswhpd
SHA256 4a2b8775c52b3594c1e8889afdf96c1477853d5b912b3ede8248fa306da74bcd
MD5 63f2fc876c09c7a6a1700612e479f251
SHA1 36acdc5c72b3159ce9b2764259a3c208ff2d4f54
SHA512 9bdd352918b393a5a8d39f0b1535cea00f21a2127ebaca992dc159895549a6b5c7efe057442831d959dc7fdc166f5d3e5a9b77dd50fa0899c9abe117542e6647
SSDEEP 12288:+oiyf03HDkrzviq6C09GZPQcxaBOzcL75WmnTKWfg0wxXSjqT9tMM/GU9fWXaFQI:+oIHgnq5IOKFQB2Fakn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

darkcomet 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

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:\\Users\\Admin\\AppData\\Roaming\\Windows\\Updates\\winupdate.exe"	vbc.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	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
4252	winupdate.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5116-3-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5116-4-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5116-6-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5116-7-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5116-8-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5116-9-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5116-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

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-1-5-21-384068567-2943195810-3631207890-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinUpdater32 = "C:\\Users\\Admin\\AppData\\Roaming\\Windows\\Updates\\winupdate.exe"	vbc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1508 set thread context of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84

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	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
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	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

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	vbc.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	5116	vbc.exe
Token: SeSecurityPrivilege	5116	vbc.exe
Token: SeTakeOwnershipPrivilege	5116	vbc.exe
Token: SeLoadDriverPrivilege	5116	vbc.exe
Token: SeSystemProfilePrivilege	5116	vbc.exe
Token: SeSystemtimePrivilege	5116	vbc.exe
Token: SeProfSingleProcessPrivilege	5116	vbc.exe
Token: SeIncBasePriorityPrivilege	5116	vbc.exe
Token: SeCreatePagefilePrivilege	5116	vbc.exe
Token: SeBackupPrivilege	5116	vbc.exe
Token: SeRestorePrivilege	5116	vbc.exe
Token: SeShutdownPrivilege	5116	vbc.exe
Token: SeDebugPrivilege	5116	vbc.exe
Token: SeSystemEnvironmentPrivilege	5116	vbc.exe
Token: SeChangeNotifyPrivilege	5116	vbc.exe
Token: SeRemoteShutdownPrivilege	5116	vbc.exe
Token: SeUndockPrivilege	5116	vbc.exe
Token: SeManageVolumePrivilege	5116	vbc.exe
Token: SeImpersonatePrivilege	5116	vbc.exe
Token: SeCreateGlobalPrivilege	5116	vbc.exe
Token: 33	5116	vbc.exe
Token: 34	5116	vbc.exe
Token: 35	5116	vbc.exe
Token: 36	5116	vbc.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 1508 wrote to memory of 5116	1508	63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe	84
PID 5116 wrote to memory of 4904	5116	vbc.exe	86
PID 5116 wrote to memory of 4904	5116	vbc.exe	86
PID 5116 wrote to memory of 4904	5116	vbc.exe	86
PID 5116 wrote to memory of 4252	5116	vbc.exe	89
PID 5116 wrote to memory of 4252	5116	vbc.exe	89
PID 5116 wrote to memory of 4252	5116	vbc.exe	89

C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\63f2fc876c09c7a6a1700612e479f251_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1508
- 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
  - Drops file in Drivers directory
  - Checks BIOS information in registry
  - Adds Run key to start application
  - Checks processor information in registry
  - Enumerates system info in registry
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5116
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    PID:4904
- - C:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe
    "C:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe"
    3⤵
    - Executes dropped EXE
    PID:4252

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:\Users\Admin\AppData\Roaming\Windows\Updates\winupdate.exe
Size 1.1MB
SHA256 b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0
MD5 d881de17aa8f2e2c08cbb7b265f928f9
SHA1 08936aebc87decf0af6e8eada191062b5e65ac2a
SHA512 5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34
SSDEEP 24576:jp2silPBMIXGWClfuRcUGIJYK15Qs/QZM:jp2sMO7VzUTJH15QFZM
MD5 SHA1 SHA512 SSDEEP

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memory/1508-0-0x00000000751E2000-0x00000000751E3000-memory.dmp

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memory/1508-1-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/1508-2-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/1508-10-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/5116-3-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/5116-4-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/5116-6-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/5116-7-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/5116-8-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/5116-9-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/5116-72-0x0000000000400000-0x00000000004B5000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads