Analysis

  • max time kernel
    62s
  • max time network
    139s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/10/2022, 07:06

General

  • Target

    a0c68d73c01a70d1ed9b984d7a92d7a33d2b6b76fb48774137443c538b9a1035.exe

  • Size

    1022KB

  • MD5

    71aa732bc440747865b80aa4ae6b7964

  • SHA1

    3fcee2da11b8c942ba2029f074e3452ca74d5d47

  • SHA256

    a0c68d73c01a70d1ed9b984d7a92d7a33d2b6b76fb48774137443c538b9a1035

  • SHA512

    58ca1d67623fa73dec810467a22842c6c761f843b6eae7d1da27b060db1c39b919bc98284ff2d94602aa4a8a929cff2d3126d82acd1d2464ecdd7e2674c8e6b8

  • SSDEEP

    24576:6vOTggIRfmQX3zRYC6FVZPv+FWe4Ys/EWc:KjYlDZ3+UT/EW

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

86.19.152.61:1604

Mutex

DC_MUTEX-3SXRNQA

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    25DXBoo5LzAj

  • 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
  • Executes dropped EXE 2 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.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious use of AdjustPrivilegeToken 24 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a0c68d73c01a70d1ed9b984d7a92d7a33d2b6b76fb48774137443c538b9a1035.exe
    "C:\Users\Admin\AppData\Local\Temp\a0c68d73c01a70d1ed9b984d7a92d7a33d2b6b76fb48774137443c538b9a1035.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4628
    • C:\Users\Admin\AppData\Local\Temp\svchost.exe
      C:\Users\Admin\AppData\Local\Temp\svchost.exe
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2108
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\svchost.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3552
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\svchost.exe" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:3972
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3944
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:552
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:1844
        • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe
          "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe"
          3⤵
          • Executes dropped EXE
          PID:224

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe

            Filesize

            1.1MB

            MD5

            d881de17aa8f2e2c08cbb7b265f928f9

            SHA1

            08936aebc87decf0af6e8eada191062b5e65ac2a

            SHA256

            b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

            SHA512

            5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

          • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsc.exe

            Filesize

            1.1MB

            MD5

            d881de17aa8f2e2c08cbb7b265f928f9

            SHA1

            08936aebc87decf0af6e8eada191062b5e65ac2a

            SHA256

            b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

            SHA512

            5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

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

            Filesize

            1.1MB

            MD5

            d881de17aa8f2e2c08cbb7b265f928f9

            SHA1

            08936aebc87decf0af6e8eada191062b5e65ac2a

            SHA256

            b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

            SHA512

            5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

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

            Filesize

            1.1MB

            MD5

            d881de17aa8f2e2c08cbb7b265f928f9

            SHA1

            08936aebc87decf0af6e8eada191062b5e65ac2a

            SHA256

            b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

            SHA512

            5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

          • memory/2108-140-0x0000000000400000-0x00000000004B3000-memory.dmp

            Filesize

            716KB

          • memory/2108-142-0x0000000000400000-0x00000000004B3000-memory.dmp

            Filesize

            716KB

          • memory/2108-137-0x0000000000400000-0x00000000004B3000-memory.dmp

            Filesize

            716KB

          • memory/2108-148-0x0000000000400000-0x00000000004B3000-memory.dmp

            Filesize

            716KB

          • memory/2108-136-0x0000000000400000-0x00000000004B3000-memory.dmp

            Filesize

            716KB

          • memory/2108-133-0x0000000000400000-0x00000000004B3000-memory.dmp

            Filesize

            716KB

          • memory/4628-138-0x0000000074BF0000-0x00000000751A1000-memory.dmp

            Filesize

            5.7MB

          • memory/4628-151-0x0000000074BF0000-0x00000000751A1000-memory.dmp

            Filesize

            5.7MB