darkcomet | 846d82f6f9d6b965ef683cd91724d72917263cf21e9f0f7e4ed2cb4f1ceacce8

Analysis

max time kernel
150s
max time network
152s
platform
windows10_x64
resource
win10v20210410
submitted
19/07/2021, 21:25

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General

Target
6c592736cf6ae24c1d7e5d051234fdbd.exe
Size 1.1MB
Sample210719-n5t5cs4fcs
SHA256 846d82f6f9d6b965ef683cd91724d72917263cf21e9f0f7e4ed2cb4f1ceacce8
MD5 6c592736cf6ae24c1d7e5d051234fdbd
SHA1 dcfddb9aed55a79e38287ddd4e849728d61b67c7
SHA512 e5d7692eec1fbdf05c87164951d93a911c0c2308e700d5b7543852c98d31fddfc2c2ed043a514def3a1d9e5fe7317b3771f148dad2c900a3e58e3454e1e6fad1
MD5 SHA1 SHA512

Score

10^/10

darkcomet njrat gg nyan cat evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

secret92.ddns.net:82

Mutex

DC_MUTEX-A6ET8RQ

Attributes

InstallPath
MSDCSC\msdcsc.exe
gencode
oqyLUmi211Cb
install
true
offline_keylogger
true
persistence
true
reg_key
MicroUpdate

Extracted

Family

njrat

Version

0.7NC

Botnet

NYAN CAT

secret92.ddns.net:8082

Mutex

0c3398f1458

Attributes

reg_key
0c3398f1458
splitter
@!#&^%$

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

T1004

Modify Registry

T1112

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

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 4 IoCs

pid	Process
2284	darknj.exe
2472	R-Launcher.exe
1256	NJ.EXE
364	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Control Panel\International\Geo\Nation	darknj.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

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

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	darknj.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\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

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4076	2732	WerFault.exe	77

Modifies registry class 1 IoCs

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

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe
4076	WerFault.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
364	msdcsc.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2284	darknj.exe
Token: SeSecurityPrivilege	2284	darknj.exe
Token: SeTakeOwnershipPrivilege	2284	darknj.exe
Token: SeLoadDriverPrivilege	2284	darknj.exe
Token: SeSystemProfilePrivilege	2284	darknj.exe
Token: SeSystemtimePrivilege	2284	darknj.exe
Token: SeProfSingleProcessPrivilege	2284	darknj.exe
Token: SeIncBasePriorityPrivilege	2284	darknj.exe
Token: SeCreatePagefilePrivilege	2284	darknj.exe
Token: SeBackupPrivilege	2284	darknj.exe
Token: SeRestorePrivilege	2284	darknj.exe
Token: SeShutdownPrivilege	2284	darknj.exe
Token: SeDebugPrivilege	2284	darknj.exe
Token: SeSystemEnvironmentPrivilege	2284	darknj.exe
Token: SeChangeNotifyPrivilege	2284	darknj.exe
Token: SeRemoteShutdownPrivilege	2284	darknj.exe
Token: SeUndockPrivilege	2284	darknj.exe
Token: SeManageVolumePrivilege	2284	darknj.exe
Token: SeImpersonatePrivilege	2284	darknj.exe
Token: SeCreateGlobalPrivilege	2284	darknj.exe
Token: 33	2284	darknj.exe
Token: 34	2284	darknj.exe
Token: 35	2284	darknj.exe
Token: 36	2284	darknj.exe
Token: SeDebugPrivilege	4076	WerFault.exe
Token: SeIncreaseQuotaPrivilege	364	msdcsc.exe
Token: SeSecurityPrivilege	364	msdcsc.exe
Token: SeTakeOwnershipPrivilege	364	msdcsc.exe
Token: SeLoadDriverPrivilege	364	msdcsc.exe
Token: SeSystemProfilePrivilege	364	msdcsc.exe
Token: SeSystemtimePrivilege	364	msdcsc.exe
Token: SeProfSingleProcessPrivilege	364	msdcsc.exe
Token: SeIncBasePriorityPrivilege	364	msdcsc.exe
Token: SeCreatePagefilePrivilege	364	msdcsc.exe
Token: SeBackupPrivilege	364	msdcsc.exe
Token: SeRestorePrivilege	364	msdcsc.exe
Token: SeShutdownPrivilege	364	msdcsc.exe
Token: SeDebugPrivilege	364	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	364	msdcsc.exe
Token: SeChangeNotifyPrivilege	364	msdcsc.exe
Token: SeRemoteShutdownPrivilege	364	msdcsc.exe
Token: SeUndockPrivilege	364	msdcsc.exe
Token: SeManageVolumePrivilege	364	msdcsc.exe
Token: SeImpersonatePrivilege	364	msdcsc.exe
Token: SeCreateGlobalPrivilege	364	msdcsc.exe
Token: 33	364	msdcsc.exe
Token: 34	364	msdcsc.exe
Token: 35	364	msdcsc.exe
Token: 36	364	msdcsc.exe
Token: SeDebugPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE
Token: 33	1256	NJ.EXE
Token: SeIncBasePriorityPrivilege	1256	NJ.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
364	msdcsc.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 3944 wrote to memory of 2284	3944	6c592736cf6ae24c1d7e5d051234fdbd.exe	75
PID 3944 wrote to memory of 2284	3944	6c592736cf6ae24c1d7e5d051234fdbd.exe	75
PID 3944 wrote to memory of 2284	3944	6c592736cf6ae24c1d7e5d051234fdbd.exe	75
PID 3944 wrote to memory of 2472	3944	6c592736cf6ae24c1d7e5d051234fdbd.exe	76
PID 3944 wrote to memory of 2472	3944	6c592736cf6ae24c1d7e5d051234fdbd.exe	76
PID 3944 wrote to memory of 2472	3944	6c592736cf6ae24c1d7e5d051234fdbd.exe	76
PID 2472 wrote to memory of 2732	2472	R-Launcher.exe	77
PID 2472 wrote to memory of 2732	2472	R-Launcher.exe	77
PID 2284 wrote to memory of 1072	2284	darknj.exe	78
PID 2284 wrote to memory of 1072	2284	darknj.exe	78
PID 2284 wrote to memory of 1072	2284	darknj.exe	78
PID 2284 wrote to memory of 3808	2284	darknj.exe	80
PID 2284 wrote to memory of 3808	2284	darknj.exe	80
PID 2284 wrote to memory of 3808	2284	darknj.exe	80
PID 2284 wrote to memory of 1256	2284	darknj.exe	83
PID 2284 wrote to memory of 1256	2284	darknj.exe	83
PID 2284 wrote to memory of 1256	2284	darknj.exe	83
PID 1072 wrote to memory of 364	1072	cmd.exe	89
PID 1072 wrote to memory of 364	1072	cmd.exe	89
PID 1072 wrote to memory of 364	1072	cmd.exe	89
PID 3808 wrote to memory of 2480	3808	cmd.exe	87
PID 3808 wrote to memory of 2480	3808	cmd.exe	87
PID 3808 wrote to memory of 2480	3808	cmd.exe	87
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 2680	2284	darknj.exe	88
PID 2284 wrote to memory of 364	2284	darknj.exe	89
PID 2284 wrote to memory of 364	2284	darknj.exe	89
PID 2284 wrote to memory of 364	2284	darknj.exe	89
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90
PID 364 wrote to memory of 2744	364	msdcsc.exe	90

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

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

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
2480	attrib.exe
364	attrib.exe

C:\Users\Admin\AppData\Local\Temp\6c592736cf6ae24c1d7e5d051234fdbd.exe
"C:\Users\Admin\AppData\Local\Temp\6c592736cf6ae24c1d7e5d051234fdbd.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3944
- C:\Users\Admin\AppData\Local\Temp\darknj.exe
  "C:\Users\Admin\AppData\Local\Temp\darknj.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Checks computer location settings
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2284
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\darknj.exe" +s +h
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1072
  - - C:\Windows\SysWOW64\attrib.exe
      attrib "C:\Users\Admin\AppData\Local\Temp\darknj.exe" +s +h
      4⤵
      Views/modifies file attributes
      PID:364
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3808
  - - C:\Windows\SysWOW64\attrib.exe
      attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
      4⤵
      Views/modifies file attributes
      PID:2480
- - C:\Users\Admin\AppData\Local\Temp\NJ.EXE
    "C:\Users\Admin\AppData\Local\Temp\NJ.EXE"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1256
- - C:\Windows\SysWOW64\notepad.exe
    notepad
    3⤵
    PID:2680
- - C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
    "C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe"
    3⤵
    - 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:364
  - - C:\Windows\SysWOW64\notepad.exe
      notepad
      4⤵
      PID:2744
- C:\Users\Admin\AppData\Local\Temp\R-Launcher.exe
  "C:\Users\Admin\AppData\Local\Temp\R-Launcher.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:2472
- - C:\Program Files\Java\jre1.8.0_66\bin\javaw.exe
    "C:\Program Files\Java\jre1.8.0_66\bin\javaw.exe" -jar "C:\Users\Admin\AppData\Local\Temp\R-Launcher.exe"
    3⤵
    PID:2732
  - - C:\Windows\system32\WerFault.exe
      C:\Windows\system32\WerFault.exe -u -p 2732 -s 360
      4⤵
      Program crash
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4076

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

T1158

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Disabling Security Tools

T1089

Hidden Files and Directories

T1158

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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Downloads

memory/364-136-0x00000000005D0000-0x000000000071A000-memory.dmp

Download

memory/1256-133-0x0000000000E90000-0x0000000000FDA000-memory.dmp

Download

memory/2284-124-0x0000000000590000-0x00000000006DA000-memory.dmp

Download

memory/2680-134-0x0000000000830000-0x0000000000831000-memory.dmp

Download

memory/2744-137-0x0000000002E50000-0x0000000002E51000-memory.dmp

Download