Analysis

  • max time kernel
    120s
  • max time network
    94s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2024, 09:24

General

  • Target
    10174037f6bab4969360f655ef10a911e535d19b2c731fbe95623b1855050903.exe
  • Size 966KB
  • Sample241219-lc6xtayldt
  • SHA256 10174037f6bab4969360f655ef10a911e535d19b2c731fbe95623b1855050903
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • darkcomet

Botnet
  • Guest16

C2
  • 74.65.183.83:1604

  • 74.65.183.83:25565

  • 74.65.183.83:1122

  • 74.65.183.83:100

Mutex
  • DC_MUTEX-XH87550

Attributes
  • InstallPath

    WindowsUpdate.exe

  • gencode

    MwBxQSYoXbQb

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    WindoesUpdate.dll

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 3 IoCs

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

  • Executes dropped EXE 3 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 11 IoCs

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

  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\10174037f6bab4969360f655ef10a911e535d19b2c731fbe95623b1855050903.exe
    "C:\Users\Admin\AppData\Local\Temp\10174037f6bab4969360f655ef10a911e535d19b2c731fbe95623b1855050903.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2448
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RarSFX0\dll.bat" "
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3616
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\BlackWidowV4CrackedBySkullTeam.sfx.exe
        BlackWidowV4CrackedBySkullTeam.sfx -parrow1998 -dC:\Users\Admin\AppData\Roaming
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3036
        • C:\Users\Admin\AppData\Local\Temp\RarSFX1\BlackWidowV4CrackedBySkullTeam.exe
          "C:\Users\Admin\AppData\Local\Temp\RarSFX1\BlackWidowV4CrackedBySkullTeam.exe"
          4⤵
          • Modifies WinLogon for persistence
          • Checks computer location settings
          • Executes dropped EXE
          • Adds Run key to start application
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4268
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\RarSFX1\BlackWidowV4CrackedBySkullTeam.exe" +s +h
            5⤵
            • System Location Discovery: System Language Discovery
            PID:4884
            • C:\Windows\SysWOW64\attrib.exe
              attrib "C:\Users\Admin\AppData\Local\Temp\RarSFX1\BlackWidowV4CrackedBySkullTeam.exe" +s +h
              6⤵
              • Sets file to hidden
              • System Location Discovery: System Language Discovery
              • Views/modifies file attributes
              PID:2520
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\RarSFX1" +s +h
            5⤵
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:1792
            • C:\Windows\SysWOW64\attrib.exe
              attrib "C:\Users\Admin\AppData\Local\Temp\RarSFX1" +s +h
              6⤵
              • Sets file to hidden
              • System Location Discovery: System Language Discovery
              • Views/modifies file attributes
              PID:4316
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            5⤵
            • System Location Discovery: System Language Discovery
            PID:1916
          • C:\WindowsUpdate.exe
            "C:\WindowsUpdate.exe"
            5⤵
            • 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:4076
            • C:\Program Files (x86)\Internet Explorer\iexplore.exe
              "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
              6⤵
                PID:4892
              • C:\Windows\explorer.exe
                "C:\Windows\explorer.exe"
                6⤵
                  PID:2648
                • C:\Windows\SysWOW64\notepad.exe
                  notepad
                  6⤵
                  • System Location Discovery: System Language Discovery
                  PID:2304

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            BlackWidowV4CrackedBySkullTeam.sfx.exe

            • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\BlackWidowV4CrackedBySkullTeam.sfx.exe
            • Size 519KB
            • SHA256 00f0d8dd7eb761c34048df8706a526963150d95f592ef7e9bb4caa93947114bb
            • MD5 SHA1 SHA512 SSDEEP

            dll.bat

            • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\dll.bat
            • Size 58B
            • SHA256 1c4d169e0bb2016066e4e545c89426addb0aaaf58240d2740be8d85753b94261
            • MD5 SHA1 SHA512

            BlackWidowV4CrackedBySkullTeam.exe

            • Path C:\Users\Admin\AppData\Local\Temp\RarSFX1\BlackWidowV4CrackedBySkullTeam.exe
            • Size 1004KB
            • SHA256 3a4da5311a97fa8a4e8142b6e4847e9effd69b3d6abe7c3bd0a5922cf1bc3cf2
            • MD5 SHA1 SHA512 SSDEEP

            memory/1916-24-0x00000000010F0000-0x00000000010F1000-memory.dmp

            memory/2304-35-0x0000000000E60000-0x0000000000E61000-memory.dmp

            memory/4076-38-0x0000000000400000-0x0000000000508000-memory.dmp

            memory/4076-40-0x0000000000400000-0x0000000000508000-memory.dmp

            memory/4268-36-0x0000000000400000-0x0000000000508000-memory.dmp