Analysis

  • max time kernel
    150s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/01/2024, 21:02

General

  • Target

    6b78492169ace001ed943e1c098dbc78.exe

  • Size

    253KB

  • MD5

    6b78492169ace001ed943e1c098dbc78

  • SHA1

    c81c521e28d81be3dd1ea6d9980af29ef79e944c

  • SHA256

    88695f106560d1c1848111fdcef15e2983f0f0f2c5a8f8957df0cc530783f896

  • SHA512

    2fcc6591dd012a1d8a6a7d4b145c51ac07e00ffcb7906c9bc42804a19cf287dfa917e166f1b423c3a69e97b70520dd4605024a998e6e7f2c88a06d218f08f920

  • SSDEEP

    6144:1D7cY2fgssM7Wirg9KXylmRiL+QMeC/i6isqX7UovnONztByipwxZ:1l8E4w5huat7UovONzbXw

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

:27015

94.243.21.22:27015

Mutex

DC_MUTEX-3ZYGN23

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    Vzb0NGBAb11T

  • install

    true

  • offline_keylogger

    false

  • persistence

    false

  • 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 firewall policy service 2 TTPs 3 IoCs
  • Modifies security service 2 TTPs 1 IoCs
  • Windows security bypass 2 TTPs 2 IoCs
  • Disables RegEdit via registry modification 1 IoCs
  • Disables Task Manager via registry modification
  • 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
  • UPX packed file 10 IoCs

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

  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6b78492169ace001ed943e1c098dbc78.exe
    "C:\Users\Admin\AppData\Local\Temp\6b78492169ace001ed943e1c098dbc78.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2432
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\6b78492169ace001ed943e1c098dbc78.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2348
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\6b78492169ace001ed943e1c098dbc78.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:232
    • 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:1584
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:4968
    • C:\Windows\MSDCSC\msdcsc.exe
      "C:\Windows\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Modifies security service
      • Windows security bypass
      • Disables RegEdit via registry modification
      • Executes dropped EXE
      • Windows security modification
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:4608
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
          PID:4724
        • C:\Windows\explorer.exe
          "C:\Windows\explorer.exe"
          3⤵
            PID:1824
          • C:\Windows\SysWOW64\notepad.exe
            notepad
            3⤵
              PID:4388

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              • C:\Windows\MSDCSC\msdcsc.exe

                Filesize

                253KB

                MD5

                6b78492169ace001ed943e1c098dbc78

                SHA1

                c81c521e28d81be3dd1ea6d9980af29ef79e944c

                SHA256

                88695f106560d1c1848111fdcef15e2983f0f0f2c5a8f8957df0cc530783f896

                SHA512

                2fcc6591dd012a1d8a6a7d4b145c51ac07e00ffcb7906c9bc42804a19cf287dfa917e166f1b423c3a69e97b70520dd4605024a998e6e7f2c88a06d218f08f920

              • memory/2432-0-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/2432-1-0x00000000024E0000-0x00000000024E1000-memory.dmp

                Filesize

                4KB

              • memory/2432-63-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4388-65-0x0000000001360000-0x0000000001361000-memory.dmp

                Filesize

                4KB

              • memory/4608-64-0x00000000006B0000-0x00000000006B1000-memory.dmp

                Filesize

                4KB

              • memory/4608-62-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4608-66-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4608-68-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4608-70-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4608-73-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4608-75-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB

              • memory/4608-77-0x0000000000400000-0x00000000004BA000-memory.dmp

                Filesize

                744KB