darkcomet | b918d3de5c87e80f6dd7cb945bece30325b7700fed75c32081753c5894d1919e

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
25-11-2024 03:04

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General

Target

VKBOT.exe
Size

658KB
MD5

e1013f580361131d2d983a866c14f68f
SHA1

fe0bca3bd6b437b551bc623a11d0e4ce92c095dc
SHA256

6a8ecebda423b2979e92809e8567861480e9ec06422eec0399746e06275214cc
SHA512

1749a583805d3d784bfa63f0d82f936ecd320ff5d3ba10146f0530b63ad976908629226bc81e7e7071d71a956f7c4278b85ff3a240bc9d7c089678c3fe4e54f5
SSDEEP

12288:S9HMeUmcufrvA3kb445UEJ2jsWiD4EvFuu4cNgZhCiZKD/XdyFd:+iBIGkbxqEcjsWiDxguehC2SG

Score

10^/10

darkcomet guest16 discovery evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

mrhomer228.ddns.net:1606

Mutex

DC_MUTEX-FKPEL23

Attributes

InstallPath
windownsys.exe
gencode
HsrmtxZDk9Q9
install
true
offline_keylogger
true
persistence
false
reg_key
windownsys.exe

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\\windownsys.exe"	VKBOT.exe

Modifies firewall policy service 3 TTPs 3 IoCs

evasion

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

description	ioc	Process
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile	windownsys.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "0"	windownsys.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\DisableNotifications = "0"	windownsys.exe

Modifies security service 2 TTPs 1 IoCs

evasion

Modify Registry

T1112

Windows Service

T1543.003

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

Windows security bypass 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	windownsys.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	windownsys.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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	VKBOT.exe

Executes dropped EXE 1 IoCs

pid	Process
3424	windownsys.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	windownsys.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	windownsys.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-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\windownsys.exe = "C:\\Windows\\system32\\windownsys.exe"	VKBOT.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\	VKBOT.exe
File created	C:\Windows\SysWOW64\windownsys.exe	VKBOT.exe
File opened for modification	C:\Windows\SysWOW64\windownsys.exe	VKBOT.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 2 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	VKBOT.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	windownsys.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3896	VKBOT.exe
Token: SeSecurityPrivilege	3896	VKBOT.exe
Token: SeTakeOwnershipPrivilege	3896	VKBOT.exe
Token: SeLoadDriverPrivilege	3896	VKBOT.exe
Token: SeSystemProfilePrivilege	3896	VKBOT.exe
Token: SeSystemtimePrivilege	3896	VKBOT.exe
Token: SeProfSingleProcessPrivilege	3896	VKBOT.exe
Token: SeIncBasePriorityPrivilege	3896	VKBOT.exe
Token: SeCreatePagefilePrivilege	3896	VKBOT.exe
Token: SeBackupPrivilege	3896	VKBOT.exe
Token: SeRestorePrivilege	3896	VKBOT.exe
Token: SeShutdownPrivilege	3896	VKBOT.exe
Token: SeDebugPrivilege	3896	VKBOT.exe
Token: SeSystemEnvironmentPrivilege	3896	VKBOT.exe
Token: SeChangeNotifyPrivilege	3896	VKBOT.exe
Token: SeRemoteShutdownPrivilege	3896	VKBOT.exe
Token: SeUndockPrivilege	3896	VKBOT.exe
Token: SeManageVolumePrivilege	3896	VKBOT.exe
Token: SeImpersonatePrivilege	3896	VKBOT.exe
Token: SeCreateGlobalPrivilege	3896	VKBOT.exe
Token: 33	3896	VKBOT.exe
Token: 34	3896	VKBOT.exe
Token: 35	3896	VKBOT.exe
Token: 36	3896	VKBOT.exe
Token: SeIncreaseQuotaPrivilege	3424	windownsys.exe
Token: SeSecurityPrivilege	3424	windownsys.exe
Token: SeTakeOwnershipPrivilege	3424	windownsys.exe
Token: SeLoadDriverPrivilege	3424	windownsys.exe
Token: SeSystemProfilePrivilege	3424	windownsys.exe
Token: SeSystemtimePrivilege	3424	windownsys.exe
Token: SeProfSingleProcessPrivilege	3424	windownsys.exe
Token: SeIncBasePriorityPrivilege	3424	windownsys.exe
Token: SeCreatePagefilePrivilege	3424	windownsys.exe
Token: SeBackupPrivilege	3424	windownsys.exe
Token: SeRestorePrivilege	3424	windownsys.exe
Token: SeShutdownPrivilege	3424	windownsys.exe
Token: SeDebugPrivilege	3424	windownsys.exe
Token: SeSystemEnvironmentPrivilege	3424	windownsys.exe
Token: SeChangeNotifyPrivilege	3424	windownsys.exe
Token: SeRemoteShutdownPrivilege	3424	windownsys.exe
Token: SeUndockPrivilege	3424	windownsys.exe
Token: SeManageVolumePrivilege	3424	windownsys.exe
Token: SeImpersonatePrivilege	3424	windownsys.exe
Token: SeCreateGlobalPrivilege	3424	windownsys.exe
Token: 33	3424	windownsys.exe
Token: 34	3424	windownsys.exe
Token: 35	3424	windownsys.exe
Token: 36	3424	windownsys.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3424	windownsys.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3896 wrote to memory of 3424	3896	VKBOT.exe	83
PID 3896 wrote to memory of 3424	3896	VKBOT.exe	83
PID 3896 wrote to memory of 3424	3896	VKBOT.exe	83

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

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

C:\Users\Admin\AppData\Local\Temp\VKBOT.exe
"C:\Users\Admin\AppData\Local\Temp\VKBOT.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:3896
- C:\Windows\SysWOW64\windownsys.exe
  "C:\Windows\system32\windownsys.exe"
  2⤵
  - Modifies firewall policy service
  - Modifies security service
  - Windows security bypass
  - Executes dropped EXE
  - Windows security modification
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - System policy modification
  PID:3424

Network

MITRE ATT&CK Enterprise v15

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

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

T1562.001

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\windownsys.exe

Filesize
658KB

MD5
e1013f580361131d2d983a866c14f68f

SHA1
fe0bca3bd6b437b551bc623a11d0e4ce92c095dc

SHA256
6a8ecebda423b2979e92809e8567861480e9ec06422eec0399746e06275214cc

SHA512
1749a583805d3d784bfa63f0d82f936ecd320ff5d3ba10146f0530b63ad976908629226bc81e7e7071d71a956f7c4278b85ff3a240bc9d7c089678c3fe4e54f5

Download Submit
memory/3424-19-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-25-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-21-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-22-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-16-0x0000000002180000-0x0000000002181000-memory.dmp

Filesize
4KB

Download
memory/3424-17-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-18-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-20-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-29-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-28-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-15-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-23-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-24-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-13-0x0000000002180000-0x0000000002181000-memory.dmp

Filesize
4KB

Download
memory/3424-26-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3424-27-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3896-14-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3896-0-0x0000000002400000-0x0000000002401000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads