Analysis

  • max time kernel
    151s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-01-2023 04:29

General

  • Target

    cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe

  • Size

    388KB

  • MD5

    bc41c3afa15794a513e935f8be52b439

  • SHA1

    35d0331f8d07693ca0633e72aab11651c57988c0

  • SHA256

    cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79

  • SHA512

    4a29bc20d4b6854bdd72a6e2e526d16409964f4d9816e1727d63d4ec18123b0c48a26e34ebe58fc5a0646fb4941e4297dda2d21035106ecc47ba03e338e0561c

  • SSDEEP

    6144:9n9uJ4oXHig4BQ+pyGlv9ZQ+wjEqhLiLhjY0G2k262rKZvNny1PRJ:9nYbXLQyG99ZQ+shLU9YD26Ep1/

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

making.no-ip.info:1604

Mutex

DC_MUTEX-LG98A8Z

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    DEdYqFkh8e6g

  • install

    true

  • offline_keylogger

    true

  • password

    0123456789

  • 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
  • Executes dropped EXE 2 IoCs
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • UPX packed file 10 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 53 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe
    "C:\Users\Admin\AppData\Local\Temp\cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2432
    • C:\Users\Admin\AppData\Local\Temp\cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe
      "C:\Users\Admin\AppData\Local\Temp\cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe"
      2⤵
      • 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:2296
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2040
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79.exe" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:4780
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1948
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:4964
      • C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe
        "C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:4876
        • C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe
          "C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:4304
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            5⤵
              PID:4324

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Winlogon Helper DLL

    1
    T1004

    Hidden Files and Directories

    2
    T1158

    Registry Run Keys / Startup Folder

    1
    T1060

    Defense Evasion

    Modify Registry

    2
    T1112

    Hidden Files and Directories

    2
    T1158

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe
      Filesize

      388KB

      MD5

      bc41c3afa15794a513e935f8be52b439

      SHA1

      35d0331f8d07693ca0633e72aab11651c57988c0

      SHA256

      cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79

      SHA512

      4a29bc20d4b6854bdd72a6e2e526d16409964f4d9816e1727d63d4ec18123b0c48a26e34ebe58fc5a0646fb4941e4297dda2d21035106ecc47ba03e338e0561c

    • C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe
      Filesize

      388KB

      MD5

      bc41c3afa15794a513e935f8be52b439

      SHA1

      35d0331f8d07693ca0633e72aab11651c57988c0

      SHA256

      cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79

      SHA512

      4a29bc20d4b6854bdd72a6e2e526d16409964f4d9816e1727d63d4ec18123b0c48a26e34ebe58fc5a0646fb4941e4297dda2d21035106ecc47ba03e338e0561c

    • C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe
      Filesize

      388KB

      MD5

      bc41c3afa15794a513e935f8be52b439

      SHA1

      35d0331f8d07693ca0633e72aab11651c57988c0

      SHA256

      cd6cc0bd759caca3a2b8c828b92b981468cd01211d17cb5ae51436719fdc3a79

      SHA512

      4a29bc20d4b6854bdd72a6e2e526d16409964f4d9816e1727d63d4ec18123b0c48a26e34ebe58fc5a0646fb4941e4297dda2d21035106ecc47ba03e338e0561c

    • memory/1948-142-0x0000000000000000-mapping.dmp
    • memory/2040-141-0x0000000000000000-mapping.dmp
    • memory/2296-140-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/2296-135-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/2296-138-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/2296-134-0x0000000000000000-mapping.dmp
    • memory/2296-150-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/2296-136-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/2296-137-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/4304-151-0x0000000000000000-mapping.dmp
    • memory/4304-155-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/4304-156-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/4304-158-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/4304-159-0x0000000000400000-0x00000000004B7000-memory.dmp
      Filesize

      732KB

    • memory/4324-157-0x0000000000000000-mapping.dmp
    • memory/4780-143-0x0000000000000000-mapping.dmp
    • memory/4876-145-0x0000000000000000-mapping.dmp
    • memory/4964-144-0x0000000000000000-mapping.dmp