Analysis

  • max time kernel
    364s
  • max time network
    364s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-11-2022 15:45

General

  • Target

    ef878a92695f129fdcbbe3fa24322aa28b25a178c5634e7986c912794df14c05.exe

  • Size

    864KB

  • MD5

    17875d9e3865227c6ccaf732edc01906

  • SHA1

    8c35f0870026545d60ae68f488f8bb5b97a3da1d

  • SHA256

    ef878a92695f129fdcbbe3fa24322aa28b25a178c5634e7986c912794df14c05

  • SHA512

    a6fa0ac5b5846e0e34e2cc2fd22ceef56bc14cdd03dc0926b360927c438939dff64a2ca1564da6b93f5fbe115156809076cf10179c500379368dac612d22a14b

  • SSDEEP

    24576:eJJ/vxZRvmGa0/xHP8ueilAKw4uBhfmrlHj:w/JZRDzpHP8uf6pmdj

Malware Config

Extracted

Family

darkcomet

Botnet

DC8-23

C2

dctx.duckdns.org:200

Mutex

DC_MUTEX-P8HGWPL

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    TBEQV3sBL45t

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

    Modifies file attributes to stop it showing in Explorer etc.

  • Uses the VBS compiler for execution 1 TTPs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 49 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 59 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ef878a92695f129fdcbbe3fa24322aa28b25a178c5634e7986c912794df14c05.exe
    "C:\Users\Admin\AppData\Local\Temp\ef878a92695f129fdcbbe3fa24322aa28b25a178c5634e7986c912794df14c05.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3616
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      2⤵
      • Modifies WinLogon for persistence
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1064
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2204
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" +s +h
          4⤵
          • Sets file to hidden
          • Drops file in Windows directory
          • Views/modifies file attributes
          PID:4112
      • C:\MSDCSC\msdcsc.exe
        "C:\MSDCSC\msdcsc.exe"
        3⤵
        • Executes dropped EXE
        PID:3916
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
      2⤵
      • Modifies security service
      • Windows security bypass
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4764
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:1336

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\MSDCSC\msdcsc.exe

      Filesize

      1.1MB

      MD5

      d881de17aa8f2e2c08cbb7b265f928f9

      SHA1

      08936aebc87decf0af6e8eada191062b5e65ac2a

      SHA256

      b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

      SHA512

      5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

    • C:\MSDCSC\msdcsc.exe

      Filesize

      1.1MB

      MD5

      d881de17aa8f2e2c08cbb7b265f928f9

      SHA1

      08936aebc87decf0af6e8eada191062b5e65ac2a

      SHA256

      b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

      SHA512

      5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

    • memory/1064-134-0x0000000000000000-mapping.dmp

    • memory/1064-135-0x0000000000400000-0x00000000004B2000-memory.dmp

      Filesize

      712KB

    • memory/1064-136-0x0000000000400000-0x00000000004B2000-memory.dmp

      Filesize

      712KB

    • memory/1064-137-0x0000000000400000-0x00000000004B2000-memory.dmp

      Filesize

      712KB

    • memory/1064-139-0x0000000000400000-0x00000000004B2000-memory.dmp

      Filesize

      712KB

    • memory/1336-149-0x0000000000000000-mapping.dmp

    • memory/2204-138-0x0000000000000000-mapping.dmp

    • memory/3616-133-0x0000000074D40000-0x00000000752F1000-memory.dmp

      Filesize

      5.7MB

    • memory/3616-132-0x0000000074D40000-0x00000000752F1000-memory.dmp

      Filesize

      5.7MB

    • memory/3916-141-0x0000000000000000-mapping.dmp

    • memory/4112-140-0x0000000000000000-mapping.dmp

    • memory/4764-147-0x0000000000400000-0x00000000004B2000-memory.dmp

      Filesize

      712KB

    • memory/4764-148-0x0000000000400000-0x00000000004B2000-memory.dmp

      Filesize

      712KB

    • memory/4764-144-0x0000000000000000-mapping.dmp