darkcomet | 59e8f27e60ae878c8bc61b59f6a21a547c6d4c27afb47fa614efbe8e116513b3

Analysis

max time kernel
150s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
13/04/2025, 07:28

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General

Target

.exe
Size

658KB
MD5

f3aa40d99430ccb842392a6aac95a1b6
SHA1

9db9c6b9f0c790f783d359164b31f113ea79e3dc
SHA256

59e8f27e60ae878c8bc61b59f6a21a547c6d4c27afb47fa614efbe8e116513b3
SHA512

1d0c9f4c9badad6891b4cf8cf0d0cafbe14c39ffb837dac28da338bf7a111524fd5afb1a0f78e8d7b674798ff38d3e840b60b973e6adc16a5e33038fbc614a14
SSDEEP

12288:S9HMeUmcufrvA3kb445UEJ2jsWiD4EvFuu4cNgZhCiZKD/XdyFa:+iBIGkbxqEcjsWiDxguehC2Sd

Score

10^/10

darkcomet guest16 discovery persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

sound-educated.gl.at.ply.gg:33346

sound-educated.gl.at.ply.gg:1488

Mutex

DC_MUTEX-J79EFKJ

Attributes

InstallPath
cssr.exe
gencode
J5v3kYZkYi5Y
install
true
offline_keylogger
true
persistence
false
reg_key
MicroUpdate

rc4.plain

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:\\Windows\\system32\\cssr.exe"	.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-1-5-21-3027557611-1484967174-339164627-1000\Control Panel\International\Geo\Nation	.exe

Executes dropped EXE 1 IoCs

pid	Process
4268	cssr.exe

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-1-5-21-3027557611-1484967174-339164627-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Windows\\system32\\cssr.exe"	.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\	.exe
File created	C:\Windows\SysWOW64\cssr.exe	.exe
File opened for modification	C:\Windows\SysWOW64\cssr.exe	.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4268 set thread context of 3424	4268	cssr.exe	91

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 4 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	.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cssr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	notepad.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3424	iexplore.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	5640	.exe
Token: SeSecurityPrivilege	5640	.exe
Token: SeTakeOwnershipPrivilege	5640	.exe
Token: SeLoadDriverPrivilege	5640	.exe
Token: SeSystemProfilePrivilege	5640	.exe
Token: SeSystemtimePrivilege	5640	.exe
Token: SeProfSingleProcessPrivilege	5640	.exe
Token: SeIncBasePriorityPrivilege	5640	.exe
Token: SeCreatePagefilePrivilege	5640	.exe
Token: SeBackupPrivilege	5640	.exe
Token: SeRestorePrivilege	5640	.exe
Token: SeShutdownPrivilege	5640	.exe
Token: SeDebugPrivilege	5640	.exe
Token: SeSystemEnvironmentPrivilege	5640	.exe
Token: SeChangeNotifyPrivilege	5640	.exe
Token: SeRemoteShutdownPrivilege	5640	.exe
Token: SeUndockPrivilege	5640	.exe
Token: SeManageVolumePrivilege	5640	.exe
Token: SeImpersonatePrivilege	5640	.exe
Token: SeCreateGlobalPrivilege	5640	.exe
Token: 33	5640	.exe
Token: 34	5640	.exe
Token: 35	5640	.exe
Token: 36	5640	.exe
Token: SeIncreaseQuotaPrivilege	4268	cssr.exe
Token: SeSecurityPrivilege	4268	cssr.exe
Token: SeTakeOwnershipPrivilege	4268	cssr.exe
Token: SeLoadDriverPrivilege	4268	cssr.exe
Token: SeSystemProfilePrivilege	4268	cssr.exe
Token: SeSystemtimePrivilege	4268	cssr.exe
Token: SeProfSingleProcessPrivilege	4268	cssr.exe
Token: SeIncBasePriorityPrivilege	4268	cssr.exe
Token: SeCreatePagefilePrivilege	4268	cssr.exe
Token: SeBackupPrivilege	4268	cssr.exe
Token: SeRestorePrivilege	4268	cssr.exe
Token: SeShutdownPrivilege	4268	cssr.exe
Token: SeDebugPrivilege	4268	cssr.exe
Token: SeSystemEnvironmentPrivilege	4268	cssr.exe
Token: SeChangeNotifyPrivilege	4268	cssr.exe
Token: SeRemoteShutdownPrivilege	4268	cssr.exe
Token: SeUndockPrivilege	4268	cssr.exe
Token: SeManageVolumePrivilege	4268	cssr.exe
Token: SeImpersonatePrivilege	4268	cssr.exe
Token: SeCreateGlobalPrivilege	4268	cssr.exe
Token: 33	4268	cssr.exe
Token: 34	4268	cssr.exe
Token: 35	4268	cssr.exe
Token: 36	4268	cssr.exe
Token: SeIncreaseQuotaPrivilege	3424	iexplore.exe
Token: SeSecurityPrivilege	3424	iexplore.exe
Token: SeTakeOwnershipPrivilege	3424	iexplore.exe
Token: SeLoadDriverPrivilege	3424	iexplore.exe
Token: SeSystemProfilePrivilege	3424	iexplore.exe
Token: SeSystemtimePrivilege	3424	iexplore.exe
Token: SeProfSingleProcessPrivilege	3424	iexplore.exe
Token: SeIncBasePriorityPrivilege	3424	iexplore.exe
Token: SeCreatePagefilePrivilege	3424	iexplore.exe
Token: SeBackupPrivilege	3424	iexplore.exe
Token: SeRestorePrivilege	3424	iexplore.exe
Token: SeShutdownPrivilege	3424	iexplore.exe
Token: SeDebugPrivilege	3424	iexplore.exe
Token: SeSystemEnvironmentPrivilege	3424	iexplore.exe
Token: SeChangeNotifyPrivilege	3424	iexplore.exe
Token: SeRemoteShutdownPrivilege	3424	iexplore.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3424	iexplore.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 5640 wrote to memory of 4268	5640	.exe	90
PID 5640 wrote to memory of 4268	5640	.exe	90
PID 5640 wrote to memory of 4268	5640	.exe	90
PID 4268 wrote to memory of 3424	4268	cssr.exe	91
PID 4268 wrote to memory of 3424	4268	cssr.exe	91
PID 4268 wrote to memory of 3424	4268	cssr.exe	91
PID 4268 wrote to memory of 3424	4268	cssr.exe	91
PID 4268 wrote to memory of 3424	4268	cssr.exe	91
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93
PID 3424 wrote to memory of 692	3424	iexplore.exe	93

C:\Users\Admin\AppData\Local\Temp\.exe
"C:\Users\Admin\AppData\Local\Temp\.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5640
- C:\Windows\SysWOW64\cssr.exe
  "C:\Windows\system32\cssr.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4268
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3424
  - - C:\Windows\SysWOW64\notepad.exe
      notepad
      4⤵
      System Location Discovery: System Language Discovery
      PID:692

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Windows\system32\cssr.exe
1⤵
PID:3752

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\cssr.exe

Filesize
658KB

MD5
f3aa40d99430ccb842392a6aac95a1b6

SHA1
9db9c6b9f0c790f783d359164b31f113ea79e3dc

SHA256
59e8f27e60ae878c8bc61b59f6a21a547c6d4c27afb47fa614efbe8e116513b3

SHA512
1d0c9f4c9badad6891b4cf8cf0d0cafbe14c39ffb837dac28da338bf7a111524fd5afb1a0f78e8d7b674798ff38d3e840b60b973e6adc16a5e33038fbc614a14

Download Submit
memory/692-16-0x0000000001030000-0x0000000001031000-memory.dmp

Filesize
4KB

Download
memory/3424-14-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/4268-13-0x00000000022D0000-0x00000000022D1000-memory.dmp

Filesize
4KB

Download
memory/4268-15-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/5640-0-0x00000000022B0000-0x00000000022B1000-memory.dmp

Filesize
4KB

Download
memory/5640-17-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads