Analysis

  • max time kernel
    150s
  • max time network
    147s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    17-11-2020 11:34

General

  • Target

    9b89fb51be345ff9564807566ff45444.exe

  • Size

    252KB

  • MD5

    1ae87b63858a496bd9473e57fb4d8f31

  • SHA1

    30593034cc80261649a334cde198d6c2dc3a866c

  • SHA256

    113936749f6b08da52458f7536043df7dc3da181b084db8240d441ddc3d7c02d

  • SHA512

    d02eb94c60c5361138942a2af0758c8b97e72fa898f31fbb75f4055cfb2eac6a5549407b57155b8c3ee2250b64e1849f662620f2a9d69a0da6057ca440bbe37c

Malware Config

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 1 IoCs
  • 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.

  • Deletes itself 1 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 42 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9b89fb51be345ff9564807566ff45444.exe
    "C:\Users\Admin\AppData\Local\Temp\9b89fb51be345ff9564807566ff45444.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:648
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:4028
    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
      2⤵
      • 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:3304
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:3176

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Winlogon Helper DLL

    1
    T1004

    Registry Run Keys / Startup Folder

    1
    T1060

    Defense Evasion

    Modify Registry

    2
    T1112

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      1ae87b63858a496bd9473e57fb4d8f31

      SHA1

      30593034cc80261649a334cde198d6c2dc3a866c

      SHA256

      113936749f6b08da52458f7536043df7dc3da181b084db8240d441ddc3d7c02d

      SHA512

      d02eb94c60c5361138942a2af0758c8b97e72fa898f31fbb75f4055cfb2eac6a5549407b57155b8c3ee2250b64e1849f662620f2a9d69a0da6057ca440bbe37c

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      1ae87b63858a496bd9473e57fb4d8f31

      SHA1

      30593034cc80261649a334cde198d6c2dc3a866c

      SHA256

      113936749f6b08da52458f7536043df7dc3da181b084db8240d441ddc3d7c02d

      SHA512

      d02eb94c60c5361138942a2af0758c8b97e72fa898f31fbb75f4055cfb2eac6a5549407b57155b8c3ee2250b64e1849f662620f2a9d69a0da6057ca440bbe37c

    • memory/3176-6-0x0000000000000000-mapping.dmp
    • memory/3176-7-0x0000000000820000-0x0000000000821000-memory.dmp
      Filesize

      4KB

    • memory/3176-8-0x0000000000000000-mapping.dmp
    • memory/3304-3-0x0000000000000000-mapping.dmp
    • memory/4028-0-0x0000000000000000-mapping.dmp
    • memory/4028-1-0x0000000000A90000-0x0000000000A91000-memory.dmp
      Filesize

      4KB

    • memory/4028-2-0x0000000000000000-mapping.dmp