Analysis

  • max time kernel
    135s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/10/2022, 22:34

General

  • Target
    73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe
  • Size 1.1MB
  • Sample221019-2hdffsbdgk
  • SHA256 73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • darkcomet

Botnet
  • OrjiFresh

C2
  • 192.111.149.142:200

Mutex
  • DC_MUTEX-EHWJ94V

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    seU988lBxdRw

  • install

    true

  • offline_keylogger

    true

  • persistence

    false

  • 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 3 IoCs
  • 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.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 4 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 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe
    "C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2444
    • C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe
      "C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe"
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:1756
      • C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe
        "C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe"
        3⤵
        • 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:5056
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe" +s +h
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:548
          • C:\Windows\SysWOW64\attrib.exe
            attrib "C:\Users\Admin\AppData\Local\Temp\73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069.exe" +s +h
            5⤵
            • Sets file to hidden
            • Views/modifies file attributes
            PID:3620
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2236
          • C:\Windows\SysWOW64\attrib.exe
            attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
            5⤵
            • Sets file to hidden
            • Views/modifies file attributes
            PID:2212
        • C:\Windows\SysWOW64\notepad.exe
          notepad
          4⤵
            PID:1956
          • C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
            "C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:4384
            • C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
              "C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              PID:3588
              • C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
                "C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:1764

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          msdcsc.exe

          • Path C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
          • Size 1.1MB
          • SHA256 73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069
          • MD5 SHA1 SHA512 SSDEEP

          msdcsc.exe

          • Path C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
          • Size 1.1MB
          • SHA256 73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069
          • MD5 SHA1 SHA512 SSDEEP

          msdcsc.exe

          • Path C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
          • Size 1.1MB
          • SHA256 73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069
          • MD5 SHA1 SHA512 SSDEEP

          msdcsc.exe

          • Path C:\Users\Admin\AppData\Local\Temp\MSDCSC\msdcsc.exe
          • Size 1.1MB
          • SHA256 73078c58d3aef5c83895fb292b022f1f231316086ff36738b7544d53de6d2069
          • MD5 SHA1 SHA512 SSDEEP

          memory/1756-133-0x0000000000400000-0x00000000004AC000-memory.dmp

          memory/1756-135-0x0000000000400000-0x00000000004AC000-memory.dmp

          memory/1756-139-0x0000000000400000-0x00000000004AC000-memory.dmp

          memory/1764-162-0x0000000000400000-0x00000000004B2000-memory.dmp

          memory/1764-163-0x0000000000400000-0x00000000004B2000-memory.dmp

          memory/3588-160-0x0000000000400000-0x00000000004AC000-memory.dmp

          memory/5056-141-0x0000000000400000-0x00000000004B2000-memory.dmp

          memory/5056-140-0x0000000000400000-0x00000000004B2000-memory.dmp

          memory/5056-159-0x0000000000400000-0x00000000004B2000-memory.dmp

          memory/5056-138-0x0000000000400000-0x00000000004B2000-memory.dmp

          memory/5056-137-0x0000000000400000-0x00000000004B2000-memory.dmp