Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21-05-2022 19:16

General

  • Target

    87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3.exe

  • Size

    252KB

  • MD5

    32307c24db9052003547acd8c7814a09

  • SHA1

    1804e608aef820e4b344e996dbad49276cc237b5

  • SHA256

    87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3

  • SHA512

    7e3db616a5e1e25eb2b94a8a537c90b657f99fa92471c38108eb0e859476a6e5adecfe3ef46da9729cc3605a79c694f74a2a923b4f6e5f9bc5d5515186bca596

Malware Config

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
  • Disables RegEdit via registry modification
  • Disables Task Manager via registry modification
  • Executes dropped EXE 1 IoCs
  • Sets file to hidden 1 TTPs

    Modifies file attributes to stop it showing in Explorer etc.

  • UPX packed file 2 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.

  • 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). 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 59 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3.exe
    "C:\Users\Admin\AppData\Local\Temp\87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3.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:3096
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4248
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3.exe" +s +h
        3⤵
        • Views/modifies file attributes
        PID:4828
    • 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:4252
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Views/modifies file attributes
        PID:744
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
        PID:2172
      • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
        "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
        2⤵
        • Modifies firewall policy service
        • Modifies security service
        • 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:4292
        • C:\Program Files (x86)\Internet Explorer\iexplore.exe
          "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
          3⤵
            PID:2596
          • C:\Windows\explorer.exe
            "C:\Windows\explorer.exe"
            3⤵
              PID:3440
            • C:\Windows\SysWOW64\notepad.exe
              notepad
              3⤵
                PID:4612

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          Winlogon Helper DLL

          1
          T1004

          Modify Existing Service

          2
          T1031

          Hidden Files and Directories

          2
          T1158

          Registry Run Keys / Startup Folder

          1
          T1060

          Defense Evasion

          Modify Registry

          7
          T1112

          Disabling Security Tools

          2
          T1089

          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\Documents\MSDCSC\msdcsc.exe
            Filesize

            252KB

            MD5

            32307c24db9052003547acd8c7814a09

            SHA1

            1804e608aef820e4b344e996dbad49276cc237b5

            SHA256

            87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3

            SHA512

            7e3db616a5e1e25eb2b94a8a537c90b657f99fa92471c38108eb0e859476a6e5adecfe3ef46da9729cc3605a79c694f74a2a923b4f6e5f9bc5d5515186bca596

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

            252KB

            MD5

            32307c24db9052003547acd8c7814a09

            SHA1

            1804e608aef820e4b344e996dbad49276cc237b5

            SHA256

            87e1433bec2bd9d8fdc02e52d03d29005b82546996d045068ffce11088a660c3

            SHA512

            7e3db616a5e1e25eb2b94a8a537c90b657f99fa92471c38108eb0e859476a6e5adecfe3ef46da9729cc3605a79c694f74a2a923b4f6e5f9bc5d5515186bca596

          • memory/744-134-0x0000000000000000-mapping.dmp
          • memory/2172-132-0x0000000000000000-mapping.dmp
          • memory/3440-138-0x0000000000000000-mapping.dmp
          • memory/4248-130-0x0000000000000000-mapping.dmp
          • memory/4252-131-0x0000000000000000-mapping.dmp
          • memory/4292-135-0x0000000000000000-mapping.dmp
          • memory/4612-139-0x0000000000000000-mapping.dmp
          • memory/4828-133-0x0000000000000000-mapping.dmp