Analysis

  • max time kernel
    150s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-03-2023 06:44

General

  • Target

    3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f.exe

  • Size

    658KB

  • MD5

    3c41b88825ed5288001a0840f638bb15

  • SHA1

    f12e5059fa029c6eea893ab2e6745922d0d89570

  • SHA256

    3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f

  • SHA512

    bc4b3a9088e0fa70731573c0ac4a8bb4cff8ea68ef737010bfdc6eb0fadaad2e78dda5ca67be4830137f4c3a174d2fec9989b5a638d71d83b4299ede540f4401

  • SSDEEP

    12288:+9HFJ9rJxRX1uVVjoaWSoynxdO1FVBaOiRZTERfIhNkNCCLo9Ek5C/h5:KZ1xuVVjfFoynPaVBUR8f+kN10EBT

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

sussysdfffdfff343.duckdns.org:1604

Mutex

DC_MUTEX-6F4SERN

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    mKaVRbcLZnA8

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    Google Handler

Signatures

  • Darkcomet

    DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

  • Modifies WinLogon for persistence 2 TTPs 1 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.

  • Executes dropped EXE 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.

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 30 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 53 IoCs
  • Suspicious use of FindShellTrayWindow 56 IoCs
  • Suspicious use of SendNotifyMessage 55 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f.exe
    "C:\Users\Admin\AppData\Local\Temp\3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f.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:4120
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:920
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2496
    • 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:4420
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:228
    • 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:860
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
          PID:4168
        • C:\Windows\explorer.exe
          "C:\Windows\explorer.exe"
          3⤵
            PID:5052
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            3⤵
              PID:4964
        • C:\Windows\system32\taskmgr.exe
          "C:\Windows\system32\taskmgr.exe" /4
          1⤵
          • Checks SCSI registry key(s)
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          PID:4648

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Winlogon Helper DLL

        1
        T1004

        Hidden Files and Directories

        2
        T1158

        Registry Run Keys / Startup Folder

        1
        T1060

        Defense Evasion

        Modify Registry

        2
        T1112

        Hidden Files and Directories

        2
        T1158

        Discovery

        Query Registry

        2
        T1012

        System Information Discovery

        3
        T1082

        Peripheral Device Discovery

        1
        T1120

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          658KB

          MD5

          3c41b88825ed5288001a0840f638bb15

          SHA1

          f12e5059fa029c6eea893ab2e6745922d0d89570

          SHA256

          3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f

          SHA512

          bc4b3a9088e0fa70731573c0ac4a8bb4cff8ea68ef737010bfdc6eb0fadaad2e78dda5ca67be4830137f4c3a174d2fec9989b5a638d71d83b4299ede540f4401

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

          658KB

          MD5

          3c41b88825ed5288001a0840f638bb15

          SHA1

          f12e5059fa029c6eea893ab2e6745922d0d89570

          SHA256

          3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f

          SHA512

          bc4b3a9088e0fa70731573c0ac4a8bb4cff8ea68ef737010bfdc6eb0fadaad2e78dda5ca67be4830137f4c3a174d2fec9989b5a638d71d83b4299ede540f4401

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

          658KB

          MD5

          3c41b88825ed5288001a0840f638bb15

          SHA1

          f12e5059fa029c6eea893ab2e6745922d0d89570

          SHA256

          3f0b1837b836c8f882db35bc5b0510b47e6c06a996148371a05b2d2b8b46ee0f

          SHA512

          bc4b3a9088e0fa70731573c0ac4a8bb4cff8ea68ef737010bfdc6eb0fadaad2e78dda5ca67be4830137f4c3a174d2fec9989b5a638d71d83b4299ede540f4401

        • memory/860-225-0x0000000000400000-0x00000000004B2000-memory.dmp
          Filesize

          712KB

        • memory/860-195-0x0000000000690000-0x0000000000691000-memory.dmp
          Filesize

          4KB

        • memory/860-197-0x0000000000400000-0x00000000004B2000-memory.dmp
          Filesize

          712KB

        • memory/860-199-0x0000000000400000-0x00000000004B2000-memory.dmp
          Filesize

          712KB

        • memory/4120-133-0x0000000002280000-0x0000000002281000-memory.dmp
          Filesize

          4KB

        • memory/4120-196-0x0000000000400000-0x00000000004B2000-memory.dmp
          Filesize

          712KB

        • memory/4648-206-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-205-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-207-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-212-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-211-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-213-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-214-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-216-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-215-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4648-217-0x000001628DA10000-0x000001628DA11000-memory.dmp
          Filesize

          4KB

        • memory/4964-194-0x00000000001E0000-0x00000000001E1000-memory.dmp
          Filesize

          4KB