darkcomet | 8eb3881ba7d320c0760042529414e8ee87b8bfc648c34d87dd36ed854b0c8b7b

Processes:

darknj.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\\MSDCSC\\msdcsc.exe"	darknj.exe

Modifies security service 2 TTPs 1 IoCs
evasion

Modify Registry
T1112

Modify Existing Service
T1031

Processes:

msdcsc.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "4" msdcsc.exe
Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112
njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Executes dropped EXE 2 IoCs

Processes:

NJ.EXEmsdcsc.exe

pid process

3916 NJ.EXE
1016 msdcsc.exe
Sets file to hidden 1 TTPs
Modifies file attributes to stop it showing in Explorer etc.
evasion

Hidden Files and Directories
T1158
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

Processes:

darknj.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Control Panel\International\Geo\Nation darknj.exe
Deletes itself 1 IoCs

Processes:

notepad.exe

pid process

2836 notepad.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "4"	msdcsc.exe

pid	process
3916	NJ.EXE
1016	msdcsc.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Control Panel\International\Geo\Nation	darknj.exe

pid	process
2836	notepad.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

Processes:

msdcsc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	msdcsc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	msdcsc.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

Processes:

darknj.exemsdcsc.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	darknj.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	msdcsc.exe

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

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

darknj.exe

description ioc process

Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance darknj.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

msdcsc.exe

pid process

1016 msdcsc.exe

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

pid	process
1016	msdcsc.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

darknj.exemsdcsc.exeNJ.EXE

description	pid	process
Token: SeIncreaseQuotaPrivilege	580	darknj.exe
Token: SeSecurityPrivilege	580	darknj.exe
Token: SeTakeOwnershipPrivilege	580	darknj.exe
Token: SeLoadDriverPrivilege	580	darknj.exe
Token: SeSystemProfilePrivilege	580	darknj.exe
Token: SeSystemtimePrivilege	580	darknj.exe
Token: SeProfSingleProcessPrivilege	580	darknj.exe
Token: SeIncBasePriorityPrivilege	580	darknj.exe
Token: SeCreatePagefilePrivilege	580	darknj.exe
Token: SeBackupPrivilege	580	darknj.exe
Token: SeRestorePrivilege	580	darknj.exe
Token: SeShutdownPrivilege	580	darknj.exe
Token: SeDebugPrivilege	580	darknj.exe
Token: SeSystemEnvironmentPrivilege	580	darknj.exe
Token: SeChangeNotifyPrivilege	580	darknj.exe
Token: SeRemoteShutdownPrivilege	580	darknj.exe
Token: SeUndockPrivilege	580	darknj.exe
Token: SeManageVolumePrivilege	580	darknj.exe
Token: SeImpersonatePrivilege	580	darknj.exe
Token: SeCreateGlobalPrivilege	580	darknj.exe
Token: 33	580	darknj.exe
Token: 34	580	darknj.exe
Token: 35	580	darknj.exe
Token: 36	580	darknj.exe
Token: SeIncreaseQuotaPrivilege	1016	msdcsc.exe
Token: SeSecurityPrivilege	1016	msdcsc.exe
Token: SeTakeOwnershipPrivilege	1016	msdcsc.exe
Token: SeLoadDriverPrivilege	1016	msdcsc.exe
Token: SeSystemProfilePrivilege	1016	msdcsc.exe
Token: SeSystemtimePrivilege	1016	msdcsc.exe
Token: SeProfSingleProcessPrivilege	1016	msdcsc.exe
Token: SeIncBasePriorityPrivilege	1016	msdcsc.exe
Token: SeCreatePagefilePrivilege	1016	msdcsc.exe
Token: SeBackupPrivilege	1016	msdcsc.exe
Token: SeRestorePrivilege	1016	msdcsc.exe
Token: SeShutdownPrivilege	1016	msdcsc.exe
Token: SeDebugPrivilege	1016	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	1016	msdcsc.exe
Token: SeChangeNotifyPrivilege	1016	msdcsc.exe
Token: SeRemoteShutdownPrivilege	1016	msdcsc.exe
Token: SeUndockPrivilege	1016	msdcsc.exe
Token: SeManageVolumePrivilege	1016	msdcsc.exe
Token: SeImpersonatePrivilege	1016	msdcsc.exe
Token: SeCreateGlobalPrivilege	1016	msdcsc.exe
Token: 33	1016	msdcsc.exe
Token: 34	1016	msdcsc.exe
Token: 35	1016	msdcsc.exe
Token: 36	1016	msdcsc.exe
Token: SeDebugPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE
Token: SeIncBasePriorityPrivilege	3916	NJ.EXE
Token: 33	3916	NJ.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

msdcsc.exe

pid process

1016 msdcsc.exe

pid	process
1016	msdcsc.exe

Suspicious use of WriteProcessMemory 57 IoCs

Processes:

darknj.execmd.execmd.exemsdcsc.exe

description	pid	process	target process
PID 580 wrote to memory of 3744	580	darknj.exe	cmd.exe
PID 580 wrote to memory of 3744	580	darknj.exe	cmd.exe
PID 580 wrote to memory of 3744	580	darknj.exe	cmd.exe
PID 580 wrote to memory of 3088	580	darknj.exe	cmd.exe
PID 580 wrote to memory of 3088	580	darknj.exe	cmd.exe
PID 580 wrote to memory of 3088	580	darknj.exe	cmd.exe
PID 580 wrote to memory of 3916	580	darknj.exe	NJ.EXE
PID 580 wrote to memory of 3916	580	darknj.exe	NJ.EXE
PID 580 wrote to memory of 3916	580	darknj.exe	NJ.EXE
PID 3744 wrote to memory of 192	3744	cmd.exe	attrib.exe
PID 3744 wrote to memory of 192	3744	cmd.exe	attrib.exe
PID 3744 wrote to memory of 192	3744	cmd.exe	attrib.exe
PID 3088 wrote to memory of 200	3088	cmd.exe	attrib.exe
PID 3088 wrote to memory of 200	3088	cmd.exe	attrib.exe
PID 3088 wrote to memory of 200	3088	cmd.exe	attrib.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 2836	580	darknj.exe	notepad.exe
PID 580 wrote to memory of 1016	580	darknj.exe	msdcsc.exe
PID 580 wrote to memory of 1016	580	darknj.exe	msdcsc.exe
PID 580 wrote to memory of 1016	580	darknj.exe	msdcsc.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe
PID 1016 wrote to memory of 2560	1016	msdcsc.exe	notepad.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

Processes:

msdcsc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern\NoControlPanel = "1"	msdcsc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion	msdcsc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern	msdcsc.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1158

Processes:

attrib.exeattrib.exe

pid process

192 attrib.exe
200 attrib.exe

pid	process
192	attrib.exe
200	attrib.exe

C:\Users\Admin\AppData\Local\Temp\darknj.exe
"C:\Users\Admin\AppData\Local\Temp\darknj.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:580

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\darknj.exe" +s +h
2⤵
- Suspicious use of WriteProcessMemory
PID:3744

C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp\darknj.exe" +s +h
3⤵
- Views/modifies file attributes
PID:192

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
2⤵
- Suspicious use of WriteProcessMemory
PID:3088

C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
3⤵
- Views/modifies file attributes
PID:200

C:\Users\Admin\AppData\Local\Temp\NJ.EXE
"C:\Users\Admin\AppData\Local\Temp\NJ.EXE"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3916

C:\Windows\SysWOW64\notepad.exe
notepad
2⤵
- Deletes itself
PID:2836

C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
"C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe"
2⤵
- Modifies security service
- Executes dropped EXE
- Windows security modification
- Adds Run key to start application
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1016

C:\Windows\SysWOW64\notepad.exe
notepad
3⤵
PID:2560

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Modify Existing Service

T1031

Hidden Files and Directories

T1158

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

6

Disabling Security Tools

T1089

Hidden Files and Directories

T1158

Credential Access

Discovery

Query Registry

T1012

System Information Discovery