Analysis

  • max time kernel
    150s
  • max time network
    169s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/11/2022, 13:44

General

  • Target

    dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe

  • Size

    1.5MB

  • MD5

    0f6e0c6f05c337592a113d9d86bfe774

  • SHA1

    989df4383d42ad26fe7de744157d93756f89f6cf

  • SHA256

    dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80

  • SHA512

    13d1d2ae655dcc7b8b6558ec842326749afa15275bed4b01fadcdb89eadd1d8779c11d421b425f6fb1bcdf210881912ce3af54b934e1c6171fba16bf5cd0cf4c

  • SSDEEP

    24576:atb20pkaCqT5TBWgNQ7aABEC6AbZKrzm5bFxz5q8gZNR8:HVg5tQ7aAd58zm5hN5q1ZL8

Malware Config

Extracted

Family

darkcomet

Botnet

By-02

C2

perimetronew.ddns.net:5588

Mutex

DC_MUTEX-58GZCKN

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    Rm9Mj5Grbvs3

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    JavaUpdate

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
  • 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.

  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • AutoIT Executable 3 IoCs

    AutoIT scripts compiled to PE executables.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe
    "C:\Users\Admin\AppData\Local\Temp\dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3680
    • C:\Users\Admin\AppData\Local\Temp\dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe
      "C:\Users\Admin\AppData\Local\Temp\dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe"
      2⤵
      • 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:4980
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe" +s +h
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4868
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp\dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80.exe" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:3136
      • 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:4196
        • C:\Windows\SysWOW64\attrib.exe
          attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
          4⤵
          • Sets file to hidden
          • Views/modifies file attributes
          PID:4492
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:4844
        • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
          "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3892
          • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
            "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
            4⤵
            • Modifies firewall policy service
            • Modifies security service
            • Windows security bypass
            • Disables RegEdit via registry modification
            • Executes dropped EXE
            • Windows security modification
            • Adds Run key to start application
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            • System policy modification
            PID:3760
            • C:\Windows\SysWOW64\notepad.exe
              notepad
              5⤵
                PID:2480

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

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

              Filesize

              1.5MB

              MD5

              0f6e0c6f05c337592a113d9d86bfe774

              SHA1

              989df4383d42ad26fe7de744157d93756f89f6cf

              SHA256

              dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80

              SHA512

              13d1d2ae655dcc7b8b6558ec842326749afa15275bed4b01fadcdb89eadd1d8779c11d421b425f6fb1bcdf210881912ce3af54b934e1c6171fba16bf5cd0cf4c

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

              Filesize

              1.5MB

              MD5

              0f6e0c6f05c337592a113d9d86bfe774

              SHA1

              989df4383d42ad26fe7de744157d93756f89f6cf

              SHA256

              dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80

              SHA512

              13d1d2ae655dcc7b8b6558ec842326749afa15275bed4b01fadcdb89eadd1d8779c11d421b425f6fb1bcdf210881912ce3af54b934e1c6171fba16bf5cd0cf4c

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

              Filesize

              1.5MB

              MD5

              0f6e0c6f05c337592a113d9d86bfe774

              SHA1

              989df4383d42ad26fe7de744157d93756f89f6cf

              SHA256

              dac995a764d23188fce47f1108c9a1c5d9e4dcabc53ade2aeaaba850d8348f80

              SHA512

              13d1d2ae655dcc7b8b6558ec842326749afa15275bed4b01fadcdb89eadd1d8779c11d421b425f6fb1bcdf210881912ce3af54b934e1c6171fba16bf5cd0cf4c

            • memory/3760-149-0x0000000000780000-0x0000000000834000-memory.dmp

              Filesize

              720KB

            • memory/3760-150-0x0000000000780000-0x0000000000834000-memory.dmp

              Filesize

              720KB

            • memory/3760-153-0x0000000000780000-0x0000000000834000-memory.dmp

              Filesize

              720KB

            • memory/3760-152-0x0000000000780000-0x0000000000834000-memory.dmp

              Filesize

              720KB

            • memory/3760-147-0x0000000000780000-0x0000000000834000-memory.dmp

              Filesize

              720KB

            • memory/4980-135-0x00000000012A0000-0x0000000001354000-memory.dmp

              Filesize

              720KB

            • memory/4980-145-0x00000000012A0000-0x0000000001354000-memory.dmp

              Filesize

              720KB

            • memory/4980-136-0x00000000012A0000-0x0000000001354000-memory.dmp

              Filesize

              720KB

            • memory/4980-134-0x00000000012A0000-0x0000000001354000-memory.dmp

              Filesize

              720KB

            • memory/4980-133-0x00000000012A0000-0x0000000001354000-memory.dmp

              Filesize

              720KB