Malware Analysis Report

2024-08-06 17:18

Sample ID 240619-ygnm9ayejc
Target 0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118
SHA256 f173b00071e8aa63d2b7e3493203aa2b9245c3e5b43cc8626c86f655b39c6487
Tags
darkcomet guest16 persistence rat trojan upx
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

f173b00071e8aa63d2b7e3493203aa2b9245c3e5b43cc8626c86f655b39c6487

Threat Level: Known bad

The file 0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118 was found to be: Known bad.

Malicious Activity Summary

darkcomet guest16 persistence rat trojan upx

Darkcomet

Modifies WinLogon for persistence

Uses the VBS compiler for execution

Executes dropped EXE

Checks computer location settings

Loads dropped DLL

UPX packed file

Adds Run key to start application

Suspicious use of SetThreadContext

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Scripting
T1064
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Winlogon Helper DLL
T1547.004
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Winlogon Helper DLL
T1547.004
Defense Evasion
TA0005
Modify Registry
T1112
Scripting
T1064
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-19 19:45

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-19 19:45

Reported

2024-06-19 19:48

Platform

win7-20240508-en

Max time kernel

119s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe"

Signatures

Darkcomet

trojan rat darkcomet

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
N/A N/A C:\Users\Admin\Documents\MSDCSC\msdcsc.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Uses the VBS compiler for execution

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\JavaUpdtr = "C:\\Users\\Admin\\AppData\\Roaming\\JavaUpdtr\\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe" C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2556 set thread context of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSecurityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSystemtimePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeBackupPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeRestorePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeShutdownPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeChangeNotifyPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeUndockPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeManageVolumePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeImpersonatePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeCreateGlobalPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 34 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 35 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2556 wrote to memory of 2584 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2584 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
PID 2584 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
PID 2584 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
PID 2584 wrote to memory of 2500 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe"

C:\Users\Admin\AppData\Local\Temp\vbc.exe

C:\Users\Admin\AppData\Local\Temp\vbc.exe

C:\Users\Admin\Documents\MSDCSC\msdcsc.exe

"C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"

Network

N/A

Files

memory/2556-0-0x0000000074831000-0x0000000074832000-memory.dmp

memory/2556-1-0x0000000074830000-0x0000000074DDB000-memory.dmp

memory/2556-2-0x0000000074830000-0x0000000074DDB000-memory.dmp

\Users\Admin\AppData\Local\Temp\vbc.exe

MD5 34aa912defa18c2c129f1e09d75c1d7e
SHA1 9c3046324657505a30ecd9b1fdb46c05bde7d470
SHA256 6df94b7fa33f1b87142adc39b3db0613fc520d9e7a5fd6a5301dd7f51f8d0386
SHA512 d1ea9368f5d7166180612fd763c87afb647d088498887961f5e7fb0a10f4a808bd5928e8a3666d70ff794093c51ecca8816f75dd47652fd4eb23dce7f9aa1f98

memory/2584-9-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-17-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-15-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2584-13-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-11-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-20-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-21-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2556-22-0x0000000074830000-0x0000000074DDB000-memory.dmp

memory/2584-24-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-23-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-25-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-26-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2584-37-0x0000000000400000-0x0000000000570000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-19 19:45

Reported

2024-06-19 19:48

Platform

win10v2004-20240508-en

Max time kernel

80s

Max time network

100s

Command Line

"C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe"

Signatures

Darkcomet

trojan rat darkcomet

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
N/A N/A C:\Users\Admin\Documents\MSDCSC\msdcsc.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Uses the VBS compiler for execution

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\JavaUpdtr = "C:\\Users\\Admin\\AppData\\Roaming\\JavaUpdtr\\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe" C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2984 set thread context of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSecurityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSystemtimePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeBackupPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeRestorePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeShutdownPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeChangeNotifyPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeUndockPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeManageVolumePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeImpersonatePrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: SeCreateGlobalPrivilege N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 34 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 35 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A
Token: 36 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 2984 wrote to memory of 1776 N/A C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\vbc.exe
PID 1776 wrote to memory of 4704 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
PID 1776 wrote to memory of 4704 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
PID 1776 wrote to memory of 4704 N/A C:\Users\Admin\AppData\Local\Temp\vbc.exe C:\Users\Admin\Documents\MSDCSC\msdcsc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\0032923c4273ee9cae8a704f7a25fe82_JaffaCakes118.exe"

C:\Users\Admin\AppData\Local\Temp\vbc.exe

C:\Users\Admin\AppData\Local\Temp\vbc.exe

C:\Users\Admin\Documents\MSDCSC\msdcsc.exe

"C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"

Network

Country Destination Domain Proto
US 52.111.227.11:443 tcp

Files

memory/2984-0-0x00000000752A2000-0x00000000752A3000-memory.dmp

memory/2984-1-0x00000000752A0000-0x0000000075851000-memory.dmp

memory/2984-2-0x00000000752A0000-0x0000000075851000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\vbc.exe

MD5 d881de17aa8f2e2c08cbb7b265f928f9
SHA1 08936aebc87decf0af6e8eada191062b5e65ac2a
SHA256 b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0
SHA512 5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

memory/1776-7-0x0000000000400000-0x0000000000570000-memory.dmp

memory/1776-14-0x0000000000400000-0x0000000000570000-memory.dmp

memory/1776-16-0x0000000000400000-0x0000000000570000-memory.dmp

memory/2984-17-0x00000000752A0000-0x0000000075851000-memory.dmp

memory/1776-15-0x0000000000400000-0x0000000000570000-memory.dmp

memory/1776-12-0x0000000000400000-0x0000000000570000-memory.dmp

memory/1776-19-0x0000000000AA0000-0x0000000000AA1000-memory.dmp

memory/1776-30-0x0000000000400000-0x0000000000570000-memory.dmp