darkcomet | 3bf032577952a04273183885d393909cc88df592592b3931bbb2be09d76f6406

General

Target

Premium.exe
Size

1.1MB
MD5

0041c0d1fca736e86788f404a4a59ab8
SHA1

cc23f6e0c6e3c756cb167ca9e3b060f90e5e5754
SHA256

95d70ba84714f2471a57df471b583ecaade7936aa4f92783477441413813f3bd
SHA512

8cf90fb9423155304909514deddff8afd3cb31d480adebf05633f85237357f5e96ccbff01b3f3b27b490969f7983edeb32717d5ad41c5eb7213c79f9f65e2924
SSDEEP

24576:V6yr5Ms1sZAnfOUibyKbCaUvaTRb+zQy74r:V1sOxRk+R4

Score

10^/10

darkcomet discovery persistence rat trojan

Malware Config

Signatures

Darkcomet
DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.
trojan rat darkcomet
Darkcomet family
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\\Documents\\MSDCSC\\msdcsc.exe"	vbc.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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	vbc.exe

Executes dropped EXE 2 IoCs

pid	Process
1884	vbc.exe
1408	msdcsc.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

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-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe"	vbc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinUpdtr = "C:\\Users\\Admin\\AppData\\Roaming\\WinUpdtr\\Premium.exe"	Premium.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5088 set thread context of 1884	5088	Premium.exe	83

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Premium.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msdcsc.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1884	vbc.exe
Token: SeSecurityPrivilege	1884	vbc.exe
Token: SeTakeOwnershipPrivilege	1884	vbc.exe
Token: SeLoadDriverPrivilege	1884	vbc.exe
Token: SeSystemProfilePrivilege	1884	vbc.exe
Token: SeSystemtimePrivilege	1884	vbc.exe
Token: SeProfSingleProcessPrivilege	1884	vbc.exe
Token: SeIncBasePriorityPrivilege	1884	vbc.exe
Token: SeCreatePagefilePrivilege	1884	vbc.exe
Token: SeBackupPrivilege	1884	vbc.exe
Token: SeRestorePrivilege	1884	vbc.exe
Token: SeShutdownPrivilege	1884	vbc.exe
Token: SeDebugPrivilege	1884	vbc.exe
Token: SeSystemEnvironmentPrivilege	1884	vbc.exe
Token: SeChangeNotifyPrivilege	1884	vbc.exe
Token: SeRemoteShutdownPrivilege	1884	vbc.exe
Token: SeUndockPrivilege	1884	vbc.exe
Token: SeManageVolumePrivilege	1884	vbc.exe
Token: SeImpersonatePrivilege	1884	vbc.exe
Token: SeCreateGlobalPrivilege	1884	vbc.exe
Token: 33	1884	vbc.exe
Token: 34	1884	vbc.exe
Token: 35	1884	vbc.exe
Token: 36	1884	vbc.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 5088 wrote to memory of 1884	5088	Premium.exe	83
PID 1884 wrote to memory of 1408	1884	vbc.exe	84
PID 1884 wrote to memory of 1408	1884	vbc.exe	84
PID 1884 wrote to memory of 1408	1884	vbc.exe	84

C:\Users\Admin\AppData\Local\Temp\Premium.exe
"C:\Users\Admin\AppData\Local\Temp\Premium.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5088
- C:\Users\Admin\AppData\Local\Temp\vbc.exe
  C:\Users\Admin\AppData\Local\Temp\vbc.exe
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1884
- - C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
    "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1408

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
memory/1884-7-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/1884-10-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/1884-14-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/1884-16-0x00000000006F0000-0x00000000006F1000-memory.dmp

Filesize
4KB

Download
memory/1884-13-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/1884-28-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/5088-0-0x00000000748F2000-0x00000000748F3000-memory.dmp

Filesize
4KB

Download
memory/5088-1-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download
memory/5088-2-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download
memory/5088-15-0x00000000748F0000-0x0000000074EA1000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads