Analysis

  • max time kernel
    151s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/10/2022, 02:33

General

  • Target

    553042bd72a07ada473128811ca5a4e56249c2e749cbb8699e6d88d9bcb25833.exe

  • Size

    827KB

  • MD5

    65bb78e2781f8a31d30946f75661bab0

  • SHA1

    b63034503555aaa131e0d6f2a4be0c92a4d2ccc2

  • SHA256

    553042bd72a07ada473128811ca5a4e56249c2e749cbb8699e6d88d9bcb25833

  • SHA512

    97ca39a02a186c944a975b12c98a2df1fedeaaa5b07f2818137b5f1fc8e70557c36af37ef60375901aba9d6bd394d46dc70392bcc80d77d0558bd267d83e97fd

  • SSDEEP

    12288:vYUAMakAq1mmesJGR0zwnLbIrndRQHuVqe25EEk4NvWT7bkMhJnmvkmXhQnltj60:haNqleuGgwsMuE5E+NeT7av5hQuY

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

hashtagyolo.sytes.net:1604

77.248.186.202:1604

Mutex

DC_MUTEX-AMVW5LU

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    HY70tdZhA2dU

  • install

    true

  • offline_keylogger

    true

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

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\553042bd72a07ada473128811ca5a4e56249c2e749cbb8699e6d88d9bcb25833.exe
    "C:\Users\Admin\AppData\Local\Temp\553042bd72a07ada473128811ca5a4e56249c2e749cbb8699e6d88d9bcb25833.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4448
    • C:\Users\Admin\AppData\Local\Temp\Crypted.exe
      "C:\Users\Admin\AppData\Local\Temp\Crypted.exe"
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Checks computer location settings
      • Adds Run key to start application
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1764
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\Crypted.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:5008
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\Crypted.exe" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:1132
      • C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe
        "C:\Users\Admin\AppData\Roaming\MSDCSC\msdcsc.exe"
        3⤵
        • Modifies security service
        • Windows security bypass
        • Disables RegEdit via registry modification
        • 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:228
        • C:\Windows\SysWOW64\notepad.exe
          notepad
          4⤵
            PID:4788

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\Crypted.exe

            Filesize

            766KB

            MD5

            a5301725ad37183aeb89e4515fcff0d5

            SHA1

            17ac030c7ea4d427548e9b4fdd456425c8a6ac9e

            SHA256

            00197e1dd48e47f58023c1f92715a5dae72022d5bd27c8fa6922e108be7fc37a

            SHA512

            95e422dc9828b690d6938e0f372b6a74a13c91b56c8f1c57752eb8e92f67edbb609084a128e41c471c6fdbfab83103332c084a3a94be3639d3083e3cb77ce2dc

          • C:\Users\Admin\AppData\Local\Temp\Crypted.exe

            Filesize

            766KB

            MD5

            a5301725ad37183aeb89e4515fcff0d5

            SHA1

            17ac030c7ea4d427548e9b4fdd456425c8a6ac9e

            SHA256

            00197e1dd48e47f58023c1f92715a5dae72022d5bd27c8fa6922e108be7fc37a

            SHA512

            95e422dc9828b690d6938e0f372b6a74a13c91b56c8f1c57752eb8e92f67edbb609084a128e41c471c6fdbfab83103332c084a3a94be3639d3083e3cb77ce2dc

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

            Filesize

            766KB

            MD5

            a5301725ad37183aeb89e4515fcff0d5

            SHA1

            17ac030c7ea4d427548e9b4fdd456425c8a6ac9e

            SHA256

            00197e1dd48e47f58023c1f92715a5dae72022d5bd27c8fa6922e108be7fc37a

            SHA512

            95e422dc9828b690d6938e0f372b6a74a13c91b56c8f1c57752eb8e92f67edbb609084a128e41c471c6fdbfab83103332c084a3a94be3639d3083e3cb77ce2dc

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

            Filesize

            766KB

            MD5

            a5301725ad37183aeb89e4515fcff0d5

            SHA1

            17ac030c7ea4d427548e9b4fdd456425c8a6ac9e

            SHA256

            00197e1dd48e47f58023c1f92715a5dae72022d5bd27c8fa6922e108be7fc37a

            SHA512

            95e422dc9828b690d6938e0f372b6a74a13c91b56c8f1c57752eb8e92f67edbb609084a128e41c471c6fdbfab83103332c084a3a94be3639d3083e3cb77ce2dc

          • memory/4448-132-0x00007FFAD8040000-0x00007FFAD8A76000-memory.dmp

            Filesize

            10.2MB