darkcomet | c96325777c1db10cc8d7fd4371cd29d8a4fcba2ea5a421d296df36b072355333

Analysis

max time kernel
149s
max time network
116s
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, 07:17

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General

Target

dllhost.exe
Size

658KB
MD5

19ff0b8faebbeca871f17a931bffdf1a
SHA1

433d123f4733bb8cc867b2110858727e530ec7e4
SHA256

c96325777c1db10cc8d7fd4371cd29d8a4fcba2ea5a421d296df36b072355333
SHA512

e9a0af471d8cf5799631ae5bbb8e764f9aef885f67001ba9997d938e11b7198e921d945c9eed91441a5a0773145c2e19fae5e2af2a89424c0e3d9fec2c7545fa
SSDEEP

12288:C9HMeUmcufrvA3kb445UEJ2jsWiD4EvFuu4cNgZhCiZKD/XdyF3:uiBIGkbxqEcjsWiDxguehC2Sw

Score

10^/10

darkcomet guest16 discovery persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

christmas-flooring.gl.at.ply.gg:29421

Mutex

DC_MUTEX-94MC02K

Attributes

InstallPath
cssr.exe
gencode
yjfJYytCpL9z
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"	dllhost.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-1-5-21-2645532622-3298555945-705856666-1000\Control Panel\International\Geo\Nation	dllhost.exe

Executes dropped EXE 1 IoCs

pid	Process
772	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-1-5-21-2645532622-3298555945-705856666-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Windows\\system32\\cssr.exe"	dllhost.exe

Drops file in System32 directory 3 IoCs

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

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

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
772	cssr.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	224	dllhost.exe
Token: SeSecurityPrivilege	224	dllhost.exe
Token: SeTakeOwnershipPrivilege	224	dllhost.exe
Token: SeLoadDriverPrivilege	224	dllhost.exe
Token: SeSystemProfilePrivilege	224	dllhost.exe
Token: SeSystemtimePrivilege	224	dllhost.exe
Token: SeProfSingleProcessPrivilege	224	dllhost.exe
Token: SeIncBasePriorityPrivilege	224	dllhost.exe
Token: SeCreatePagefilePrivilege	224	dllhost.exe
Token: SeBackupPrivilege	224	dllhost.exe
Token: SeRestorePrivilege	224	dllhost.exe
Token: SeShutdownPrivilege	224	dllhost.exe
Token: SeDebugPrivilege	224	dllhost.exe
Token: SeSystemEnvironmentPrivilege	224	dllhost.exe
Token: SeChangeNotifyPrivilege	224	dllhost.exe
Token: SeRemoteShutdownPrivilege	224	dllhost.exe
Token: SeUndockPrivilege	224	dllhost.exe
Token: SeManageVolumePrivilege	224	dllhost.exe
Token: SeImpersonatePrivilege	224	dllhost.exe
Token: SeCreateGlobalPrivilege	224	dllhost.exe
Token: 33	224	dllhost.exe
Token: 34	224	dllhost.exe
Token: 35	224	dllhost.exe
Token: 36	224	dllhost.exe
Token: SeIncreaseQuotaPrivilege	772	cssr.exe
Token: SeSecurityPrivilege	772	cssr.exe
Token: SeTakeOwnershipPrivilege	772	cssr.exe
Token: SeLoadDriverPrivilege	772	cssr.exe
Token: SeSystemProfilePrivilege	772	cssr.exe
Token: SeSystemtimePrivilege	772	cssr.exe
Token: SeProfSingleProcessPrivilege	772	cssr.exe
Token: SeIncBasePriorityPrivilege	772	cssr.exe
Token: SeCreatePagefilePrivilege	772	cssr.exe
Token: SeBackupPrivilege	772	cssr.exe
Token: SeRestorePrivilege	772	cssr.exe
Token: SeShutdownPrivilege	772	cssr.exe
Token: SeDebugPrivilege	772	cssr.exe
Token: SeSystemEnvironmentPrivilege	772	cssr.exe
Token: SeChangeNotifyPrivilege	772	cssr.exe
Token: SeRemoteShutdownPrivilege	772	cssr.exe
Token: SeUndockPrivilege	772	cssr.exe
Token: SeManageVolumePrivilege	772	cssr.exe
Token: SeImpersonatePrivilege	772	cssr.exe
Token: SeCreateGlobalPrivilege	772	cssr.exe
Token: 33	772	cssr.exe
Token: 34	772	cssr.exe
Token: 35	772	cssr.exe
Token: 36	772	cssr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
772	cssr.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 224 wrote to memory of 772	224	dllhost.exe	87
PID 224 wrote to memory of 772	224	dllhost.exe	87
PID 224 wrote to memory of 772	224	dllhost.exe	87
PID 772 wrote to memory of 5300	772	cssr.exe	89
PID 772 wrote to memory of 5300	772	cssr.exe	89
PID 772 wrote to memory of 5300	772	cssr.exe	89
PID 772 wrote to memory of 1468	772	cssr.exe	90
PID 772 wrote to memory of 1468	772	cssr.exe	90
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91
PID 772 wrote to memory of 3124	772	cssr.exe	91

C:\Users\Admin\AppData\Local\Temp\dllhost.exe
"C:\Users\Admin\AppData\Local\Temp\dllhost.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:224
- C:\Windows\SysWOW64\cssr.exe
  "C:\Windows\system32\cssr.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:772
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
    3⤵
    PID:5300
- - C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    3⤵
    PID:1468
- - C:\Windows\SysWOW64\notepad.exe
    notepad
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3124

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Windows\system32\cssr.exe
1⤵
PID:5220

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
19ff0b8faebbeca871f17a931bffdf1a

SHA1
433d123f4733bb8cc867b2110858727e530ec7e4

SHA256
c96325777c1db10cc8d7fd4371cd29d8a4fcba2ea5a421d296df36b072355333

SHA512
e9a0af471d8cf5799631ae5bbb8e764f9aef885f67001ba9997d938e11b7198e921d945c9eed91441a5a0773145c2e19fae5e2af2a89424c0e3d9fec2c7545fa

Download Submit
memory/224-0-0x00000000023F0000-0x00000000023F1000-memory.dmp

Filesize
4KB

Download
memory/224-15-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/772-13-0x00000000022B0000-0x00000000022B1000-memory.dmp

Filesize
4KB

Download
memory/772-16-0x00000000022B0000-0x00000000022B1000-memory.dmp

Filesize
4KB

Download
memory/772-17-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3124-14-0x0000000000850000-0x0000000000851000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads