Analysis

  • max time kernel
    150s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-03-2024 17:03

General

  • Target

    001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86.exe

  • Size

    975KB

  • MD5

    af7484c40877c3d74d58100509797f71

  • SHA1

    70cd03800362f1b35dc5260642ebf7d2159f18b8

  • SHA256

    001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86

  • SHA512

    b964f8277222df462ffd60b321ce856bdc4956234171bd8ea57dff4adfa02a07d0101e52eb5e5db5684a5b3f56b6ec67cadb10db9fb87b8d51affe8cba9220e1

  • SSDEEP

    12288:W9HFJ9rJxRX1uVVjoaWSoynxdO1FVBaOiRZTERfIhNkNCCLo9Ek5C/hlx3st:yZ1xuVVjfFoynPaVBUR8f+kN10EBDBst

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

nakaga.ddns.net:1604

Mutex

DC_MUTEX-4A2S168

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    pkmsYsbr22Ni

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    MicroUpdate

Signatures

  • Darkcomet

    DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Modifies firewall policy service 2 TTPs 3 IoCs
  • Modifies security service 2 TTPs 1 IoCs
  • Windows security bypass 2 TTPs 2 IoCs
  • Disables RegEdit via registry modification 1 IoCs
  • Disables Task Manager via registry modification
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86.exe
    "C:\Users\Admin\AppData\Local\Temp\001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Modifies registry class
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1008
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2692
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:3236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4416
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:3772
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:4736
    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Modifies security service
      • Windows security bypass
      • Disables RegEdit via registry modification
      • 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:3576
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:1324

    Network

    MITRE ATT&CK Matrix ATT&CK v13

    Persistence

    Boot or Logon Autostart Execution

    2
    T1547

    Registry Run Keys / Startup Folder

    1
    T1547.001

    Winlogon Helper DLL

    1
    T1547.004

    Create or Modify System Process

    2
    T1543

    Windows Service

    2
    T1543.003

    Privilege Escalation

    Boot or Logon Autostart Execution

    2
    T1547

    Registry Run Keys / Startup Folder

    1
    T1547.001

    Winlogon Helper DLL

    1
    T1547.004

    Create or Modify System Process

    2
    T1543

    Windows Service

    2
    T1543.003

    Defense Evasion

    Modify Registry

    7
    T1112

    Impair Defenses

    2
    T1562

    Disable or Modify Tools

    2
    T1562.001

    Hide Artifacts

    2
    T1564

    Hidden Files and Directories

    2
    T1564.001

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      Filesize

      975KB

      MD5

      af7484c40877c3d74d58100509797f71

      SHA1

      70cd03800362f1b35dc5260642ebf7d2159f18b8

      SHA256

      001d1b9ef0730a65eeb9d7e745d9cebb76207406fa5d9580599cc46307c88d86

      SHA512

      b964f8277222df462ffd60b321ce856bdc4956234171bd8ea57dff4adfa02a07d0101e52eb5e5db5684a5b3f56b6ec67cadb10db9fb87b8d51affe8cba9220e1

    • memory/1008-0-0x0000000002450000-0x0000000002451000-memory.dmp
      Filesize

      4KB

    • memory/1008-65-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/1324-64-0x0000000000870000-0x0000000000871000-memory.dmp
      Filesize

      4KB

    • memory/3576-71-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-72-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-67-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-68-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-69-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-70-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-80-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-63-0x0000000000710000-0x0000000000711000-memory.dmp
      Filesize

      4KB

    • memory/3576-73-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-74-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-75-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-76-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-77-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-78-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/3576-79-0x0000000000400000-0x0000000000501000-memory.dmp
      Filesize

      1.0MB

    • memory/4736-4-0x0000000000AC0000-0x0000000000AC1000-memory.dmp
      Filesize

      4KB