Analysis
- max time kernel
150s - max time network
156s - platform
windows10-2004_x64 - resource
win10v2004-20241007-en - resource tags
- submitted
25/11/2024, 03:04
General
- Target VKBOT.exe
- Size 658KB
- Sample241125-dk2n3avpaw
- SHA256 6a8ecebda423b2979e92809e8567861480e9ec06422eec0399746e06275214cc
Malware Config
Extracted
-
darkcomet
-
Guest16
-
mrhomer228.ddns.net:1606
-
DC_MUTEX-FKPEL23
-
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.
- Darkcomet family
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
- Modifies firewall policy service 3 TTPs 3 IoCs
- Modifies security service 2 TTPs 1 IoCs
- Windows security bypass 2 TTPs 2 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Windows security modification 2 TTPs 2 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Drops file in System32 directory 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- 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.
- Suspicious use of AdjustPrivilegeToken 48 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
- System policy modification 1 TTPs 3 IoCs
Processes
-
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
-
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
-
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
2Windows Service
2Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
2Windows Service
2Defense Evasion
Impair Defenses
3Disable or Modify System Firewall
1Disable or Modify Tools
2Modify Registry
7Replay Monitor
Loading Replay Monitor...
Downloads
windownsys.exe
memory/3424-19-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-22-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-29-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-15-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-16-0x0000000002180000-0x0000000002181000-memory.dmp
memory/3424-17-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-18-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-28-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-13-0x0000000002180000-0x0000000002181000-memory.dmp
memory/3424-20-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-21-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-23-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-24-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-25-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-26-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3424-27-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/3896-0-0x0000000002400000-0x0000000002401000-memory.dmp
memory/3896-14-0x0000000000400000-0x00000000004B2000-memory.dmp