Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250217-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/03/2025, 01:17

General

  • Target

    DRB50_501377699da121100bc6e9180ecf9471b85264c2ea22641701b7d21995e3c3bb.exe

  • Size

    1.1MB

  • MD5

    a77502350cda394c2d5545f3e0978d6c

  • SHA1

    cd2852066d18f90cccda274627d754cd7a10a901

  • SHA256

    501377699da121100bc6e9180ecf9471b85264c2ea22641701b7d21995e3c3bb

  • SHA512

    230391cfa3c129317c5efc312021acdc7b7f3f7f95639e6f904217eacf83e5e4542000b26530fada8b2e8ed0805dab5851e2a1803e227f9dcaa8fcb6b9558b4c

  • SSDEEP

    24576:D1Z1xuVVjfFoynPaVBUR8f+kN10EBmmbm:DPQDgok30dmbm

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

egegeg.duckdns.org:1604

Mutex

DC_MUTEX-GMXC7Q3

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    bEqrgGM1ijfq

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    MicroUpdate

rc4.plain

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
  • 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 2 IoCs

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

  • Executes dropped EXE 2 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).

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • 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 57 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\DRB50_501377699da121100bc6e9180ecf9471b85264c2ea22641701b7d21995e3c3bb.exe
    "C:\Users\Admin\AppData\Local\Temp\DRB50_501377699da121100bc6e9180ecf9471b85264c2ea22641701b7d21995e3c3bb.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:820
    • C:\Users\Admin\AppData\Local\Temp\F.EXE
      "C:\Users\Admin\AppData\Local\Temp\F.EXE"
      2⤵
      • Modifies WinLogon for persistence
      • Checks computer location settings
      • Executes dropped EXE
      • Adds Run key to start application
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4152
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\F.EXE" +s +h
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4724
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\F.EXE" +s +h
          4⤵
          • Sets file to hidden
          • System Location Discovery: System Language Discovery
          • Views/modifies file attributes
          PID:2328
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2756
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • System Location Discovery: System Language Discovery
          • Views/modifies file attributes
          PID:2248
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
        • System Location Discovery: System Language Discovery
        PID:4732
      • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
        "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
        3⤵
        • 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
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        • System policy modification
        PID:4876
        • C:\Windows\SysWOW64\notepad.exe
          notepad
          4⤵
          • System Location Discovery: System Language Discovery
          PID:3372

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\F.EXE

    Filesize

    857KB

    MD5

    c72eec4eb51c62ad455de07d00a77898

    SHA1

    0251b8765a12ecb029bae796235e8283f04e96c4

    SHA256

    93435ead1cf9caa1edc3c0018b2a98c05bc0fb44af68331f5562b9aebbae1f80

    SHA512

    31da3b9a762d7a6e512e9cab8d7383e9f855d16e88652b49629ba51ef6f8b93c9032885e89d9ad5af7afad908bce179679883fcea85c86cc15411bae65018322

  • memory/3372-74-0x00000000003B0000-0x00000000003B1000-memory.dmp

    Filesize

    4KB

  • memory/4152-11-0x00000000022E0000-0x00000000022E1000-memory.dmp

    Filesize

    4KB

  • memory/4152-75-0x0000000000400000-0x00000000004E3000-memory.dmp

    Filesize

    908KB

  • memory/4732-15-0x0000000000670000-0x0000000000671000-memory.dmp

    Filesize

    4KB

  • memory/4876-77-0x0000000000400000-0x00000000004E3000-memory.dmp

    Filesize

    908KB

  • memory/4876-79-0x0000000000400000-0x00000000004E3000-memory.dmp

    Filesize

    908KB