Analysis

  • max time kernel
    93s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-01-2025 00:09

General

  • Target

    JaffaCakes118_3a557d150e6b48343d2f15279339f32e.exe

  • Size

    702KB

  • MD5

    3a557d150e6b48343d2f15279339f32e

  • SHA1

    a176f5e4f5a40947a499b39e71de8e65d0299021

  • SHA256

    94142545a37248ce7c7770d447e17b0e002d395210a1e9845926c5c00dd0cf16

  • SHA512

    444c7139f2a198e83e5747bfaed84377183538e963c1b1bcb78ac006fe0dbbb622b23fe95f3ec39b5147304e2f3c95c64a8d47cc564604ad32af10510f5c6c74

  • SSDEEP

    12288:jZx6Nt8TyctWdD9jxwyck32hg0fElpAvVT+74cIFOo/yO3gjn0qaWjOzvkzlvCIS:Ipj2cCRSBC7LvzR

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

5.75.15.123:1604

Mutex

DC_MUTEX-GY8SER2

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    urg1UWtQCv6a

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    MicroUpdate

Signatures

  • Darkcomet

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

  • Darkcomet family
  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
  • Sets file to hidden 1 TTPs 4 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 4 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in System32 directory 7 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • UPX packed file 10 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 15 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Views/modifies file attributes 1 TTPs 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3a557d150e6b48343d2f15279339f32e.exe
    "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3a557d150e6b48343d2f15279339f32e.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2516
    • C:\Users\Admin\AppData\Local\Temp\vbc.exe
      C:\Users\Admin\AppData\Local\Temp\vbc.exe
      2⤵
      • Modifies WinLogon for persistence
      • Checks computer location settings
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3964
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3a557d150e6b48343d2f15279339f32e.exe" +s +h
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1468
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3a557d150e6b48343d2f15279339f32e.exe" +s +h
          4⤵
          • Sets file to hidden
          • System Location Discovery: System Language Discovery
          • Views/modifies file attributes
          PID:3572
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2044
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • System Location Discovery: System Language Discovery
          • Views/modifies file attributes
          PID:2816
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
        • Deletes itself
        • System Location Discovery: System Language Discovery
        PID:1740
      • C:\Windows\SysWOW64\MSDCSC\msdcsc.exe
        "C:\Windows\system32\MSDCSC\msdcsc.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3284
        • C:\Users\Admin\AppData\Local\Temp\vbc.exe
          C:\Users\Admin\AppData\Local\Temp\vbc.exe
          4⤵
          • Modifies WinLogon for persistence
          • Checks computer location settings
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in System32 directory
          • System Location Discovery: System Language Discovery
          • Modifies registry class
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2528
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\vbc.exe" +s +h
            5⤵
            • System Location Discovery: System Language Discovery
            PID:4588
            • C:\Windows\SysWOW64\attrib.exe
              attrib "C:\Users\Admin\AppData\Local\Temp\vbc.exe" +s +h
              6⤵
              • Sets file to hidden
              • System Location Discovery: System Language Discovery
              • Views/modifies file attributes
              PID:2972
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
            5⤵
            • System Location Discovery: System Language Discovery
            PID:1868
            • C:\Windows\SysWOW64\attrib.exe
              attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
              6⤵
              • Sets file to hidden
              • System Location Discovery: System Language Discovery
              • Views/modifies file attributes
              PID:3520
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            5⤵
            • System Location Discovery: System Language Discovery
            PID:1444
          • C:\Windows\SysWOW64\MSDCSC\urg1UWtQCv6a\msdcsc.exe
            "C:\Windows\system32\MSDCSC\urg1UWtQCv6a\msdcsc.exe"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            PID:2700

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    1.1MB

    MD5

    d881de17aa8f2e2c08cbb7b265f928f9

    SHA1

    08936aebc87decf0af6e8eada191062b5e65ac2a

    SHA256

    b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

    SHA512

    5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

  • C:\Windows\SysWOW64\MSDCSC\msdcsc.exe

    Filesize

    702KB

    MD5

    3a557d150e6b48343d2f15279339f32e

    SHA1

    a176f5e4f5a40947a499b39e71de8e65d0299021

    SHA256

    94142545a37248ce7c7770d447e17b0e002d395210a1e9845926c5c00dd0cf16

    SHA512

    444c7139f2a198e83e5747bfaed84377183538e963c1b1bcb78ac006fe0dbbb622b23fe95f3ec39b5147304e2f3c95c64a8d47cc564604ad32af10510f5c6c74

  • memory/1740-17-0x0000000000740000-0x0000000000741000-memory.dmp

    Filesize

    4KB

  • memory/2516-1-0x0000000074A20000-0x0000000074FD1000-memory.dmp

    Filesize

    5.7MB

  • memory/2516-2-0x0000000074A20000-0x0000000074FD1000-memory.dmp

    Filesize

    5.7MB

  • memory/2516-153-0x0000000074A20000-0x0000000074FD1000-memory.dmp

    Filesize

    5.7MB

  • memory/2516-0-0x0000000074A22000-0x0000000074A23000-memory.dmp

    Filesize

    4KB

  • memory/2516-67-0x0000000074A20000-0x0000000074FD1000-memory.dmp

    Filesize

    5.7MB

  • memory/2516-18-0x0000000074A22000-0x0000000074A23000-memory.dmp

    Filesize

    4KB

  • memory/2528-148-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/2528-82-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-7-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-13-0x0000000002450000-0x0000000002451000-memory.dmp

    Filesize

    4KB

  • memory/3964-11-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-8-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-12-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-10-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-86-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-9-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB

  • memory/3964-5-0x0000000000400000-0x00000000004E8000-memory.dmp

    Filesize

    928KB