Analysis

  • max time kernel
    119s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20241023-en
  • resource tags

    arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
  • submitted
    22-11-2024 22:57

General

  • Target

    0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd.exe

  • Size

    2.7MB

  • MD5

    9ee80d36d88c45263efe383594c9e691

  • SHA1

    48474dc934a74661330f307b199581867f6baa7c

  • SHA256

    0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd

  • SHA512

    ae1fab9d36bcef8c8e65c2e93e42ff83f8fc7641d1a1662b8ecd959fd2a28cd1c57cb751ce83c8d7f815cc10e8d226065b224303ef19b53508ba0a3601337f81

  • SSDEEP

    24576:S+O4GERsRRVgXtXzrTiJe48ySFtPNe5fO:lirO9P348yqb

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 6 IoCs
  • Drops file in Windows directory 3 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\0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd.exe
    "C:\Users\Admin\AppData\Local\Temp\0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2844
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\FViZKJiodd.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1220
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2956
        • C:\Windows\System32\wiascanprofiles\winlogon.exe
          "C:\Windows\System32\wiascanprofiles\winlogon.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2144
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\bfsvc\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2668
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\lpksetup-20241023-171552-0\0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2116
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\sccls\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2680
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\wiascanprofiles\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2672
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\KBDSW09\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:532

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      212B

      MD5

      5f345e959d2ddea27a6fac44791f13f4

      SHA1

      bd7229a8700ffd2913956c1a1b9b9d749b04f469

      SHA256

      61fb6654e72a64061241e0ce0bb43386b96dee689e573a2d66f55c0f7ffe6ba6

      SHA512

      d0775852f9e8f1bd571436b3f0b9c9c3aad76a7b1b91611c057d28fdca92e7023af6a0a3f6b3393e251fe77ac092d558472aef047584c25de3c93beedb68b7bc

    • C:\Windows\System32\KBDSW09\services.exe

      Filesize

      2.7MB

      MD5

      9ee80d36d88c45263efe383594c9e691

      SHA1

      48474dc934a74661330f307b199581867f6baa7c

      SHA256

      0a5b531197542f39a3dd325cdf0ffe37d771a4c3620e6d5317c3c2c845b6a3bd

      SHA512

      ae1fab9d36bcef8c8e65c2e93e42ff83f8fc7641d1a1662b8ecd959fd2a28cd1c57cb751ce83c8d7f815cc10e8d226065b224303ef19b53508ba0a3601337f81

    • memory/2144-21-0x00000000002C0000-0x000000000056E000-memory.dmp

      Filesize

      2.7MB

    • memory/2144-22-0x0000000000670000-0x000000000067C000-memory.dmp

      Filesize

      48KB

    • memory/2144-23-0x0000000000680000-0x000000000068C000-memory.dmp

      Filesize

      48KB

    • memory/2144-24-0x00000000006A0000-0x00000000006AC000-memory.dmp

      Filesize

      48KB

    • memory/2144-26-0x00000000006E0000-0x00000000006EA000-memory.dmp

      Filesize

      40KB

    • memory/2144-25-0x00000000006B0000-0x00000000006B8000-memory.dmp

      Filesize

      32KB

    • memory/2844-0-0x000007FEF5543000-0x000007FEF5544000-memory.dmp

      Filesize

      4KB

    • memory/2844-1-0x0000000000AB0000-0x0000000000D5E000-memory.dmp

      Filesize

      2.7MB

    • memory/2844-2-0x000007FEF5540000-0x000007FEF5F2C000-memory.dmp

      Filesize

      9.9MB

    • memory/2844-18-0x000007FEF5540000-0x000007FEF5F2C000-memory.dmp

      Filesize

      9.9MB