Analysis

  • max time kernel
    15s
  • max time network
    18s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    21-11-2024 04:08

General

  • Target

    c53519ff0006a7b1a806fb8cac04e13fb6afa8ef4555a5e3079ac2b200d112af.exe

  • Size

    8.4MB

  • MD5

    23e7c44b93cb1b729d816de6e2800888

  • SHA1

    aa0d6d3655991fcc2bee30f2e4002150c3c08c7f

  • SHA256

    c53519ff0006a7b1a806fb8cac04e13fb6afa8ef4555a5e3079ac2b200d112af

  • SHA512

    78671a96f54348695f839199340cd4fa5f9816c0ab740c8492f877deba6bed3191407e3096f3bd107cde7e65cd12a15140222656c2f53f8d7ece6881ec456fb9

  • SSDEEP

    24576:L+O4Gq8ijgGfy8vWYT0Z3VTaLMo6e7h4su+A3uFDIU2lklx2yDUZFyn7ftR0K1ww:6hJgGfys0DTi7hhcGWn1ZBfY4KGrM

Malware Config

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 5 IoCs
  • Process spawned unexpected child process 5 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 10 IoCs
  • Drops file in System32 directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\c53519ff0006a7b1a806fb8cac04e13fb6afa8ef4555a5e3079ac2b200d112af.exe
    "C:\Users\Admin\AppData\Local\Temp\c53519ff0006a7b1a806fb8cac04e13fb6afa8ef4555a5e3079ac2b200d112af.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2548
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\FIadAFpkN1.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2804
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2348
        • C:\Documents and Settings\winlogon.exe
          "C:\Documents and Settings\winlogon.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2724
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\WSDApi\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2252
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Documents and Settings\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2256
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Users\Default User\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2716
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\KBDCR\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2996
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\fdWCN\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2580

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\FIadAFpkN1.bat

      Filesize

      202B

      MD5

      06b5258b0661898a63d22ca5f747820f

      SHA1

      62cdead0a2ac5de93898fbf4c8708403629ebd6b

      SHA256

      37b155a5a723638b968f9695c37485763a31f7a14546bf0c4262b9b02e0b86db

      SHA512

      73c18bc656f4949881316fe58180da8441972e104de11cb096a1f3fc561cb2c9b4c2e015bee0cd95ff60c64cfaffb9133b5918f9c45cd0dcf3c07ebb393b3516

    • C:\Windows\System32\fdWCN\winlogon.exe

      Filesize

      8.4MB

      MD5

      23e7c44b93cb1b729d816de6e2800888

      SHA1

      aa0d6d3655991fcc2bee30f2e4002150c3c08c7f

      SHA256

      c53519ff0006a7b1a806fb8cac04e13fb6afa8ef4555a5e3079ac2b200d112af

      SHA512

      78671a96f54348695f839199340cd4fa5f9816c0ab740c8492f877deba6bed3191407e3096f3bd107cde7e65cd12a15140222656c2f53f8d7ece6881ec456fb9

    • memory/2548-0-0x000007FEF56B3000-0x000007FEF56B4000-memory.dmp

      Filesize

      4KB

    • memory/2548-1-0x00000000009C0000-0x0000000001234000-memory.dmp

      Filesize

      8.5MB

    • memory/2548-2-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

      Filesize

      9.9MB

    • memory/2548-18-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

      Filesize

      9.9MB

    • memory/2724-21-0x0000000001370000-0x0000000001BE4000-memory.dmp

      Filesize

      8.5MB

    • memory/2724-23-0x0000000000370000-0x000000000037C000-memory.dmp

      Filesize

      48KB

    • memory/2724-22-0x0000000000340000-0x000000000034C000-memory.dmp

      Filesize

      48KB

    • memory/2724-24-0x0000000000410000-0x000000000041C000-memory.dmp

      Filesize

      48KB

    • memory/2724-25-0x0000000000360000-0x0000000000368000-memory.dmp

      Filesize

      32KB

    • memory/2724-26-0x00000000004B0000-0x00000000004BA000-memory.dmp

      Filesize

      40KB