Analysis

  • max time kernel
    91s
  • max time network
    93s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-01-2025 04:07

General

  • Target

    a08c1dbff924e8ae6d84449d5e354fa1d0bb729a4a265515bce03f09edb68e3cN.exe

  • Size

    783KB

  • MD5

    fe3d6c88424163b80a62962709b16250

  • SHA1

    e0c49ed67f31bfbae1269c112026a548fa4c023c

  • SHA256

    a08c1dbff924e8ae6d84449d5e354fa1d0bb729a4a265515bce03f09edb68e3c

  • SHA512

    d2225dc3bb4574bd891a9aef820d43e24d4b5c3c368855bc0edc834ce6b45473cbdcc70ac92189cbcc1bbaa680637a47182db14cb235ae2cbfbf7919ab5f0a13

  • SSDEEP

    12288:mqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:m+OQbpbgsFdAyQvzSqaq8q

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 7 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 7 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in System32 directory 12 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • System policy modification 1 TTPs 6 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\a08c1dbff924e8ae6d84449d5e354fa1d0bb729a4a265515bce03f09edb68e3cN.exe
    "C:\Users\Admin\AppData\Local\Temp\a08c1dbff924e8ae6d84449d5e354fa1d0bb729a4a265515bce03f09edb68e3cN.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:3580
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\IjrC9Km1Pt.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4664
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2992
        • C:\Windows\System32\wbem\NetPeerDistCim_uninstall\unsecapp.exe
          "C:\Windows\System32\wbem\NetPeerDistCim_uninstall\unsecapp.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • System policy modification
          PID:2340
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\DXP\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1320
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\usosvc\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:64
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Documents and Settings\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:760
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\ProgramData\regid.1991-06.com.microsoft\SearchApp.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 "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\NetPeerDistCim_uninstall\unsecapp.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1996
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Users\Default User\backgroundTaskHost.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 "explorer" /sc ONLOGON /tr "'C:\Windows\DiagTrack\Settings\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3760

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\IjrC9Km1Pt.bat

      Filesize

      226B

      MD5

      02a86eb4688bf020d39e84bafcb756a4

      SHA1

      96847d67afb9c6bd23f254de0704c488197bf46c

      SHA256

      cf14a42d4e9a9467eb198e212e68aad0ce031d5fcbd8e8d38746b7f4eaa6cd46

      SHA512

      e405ec8590edd13cf46e25da5929038990b59ce757f365c215bb10d836bc5caa3a7dc415f5d3a404a25f12651bf9bb9196e6eeb8ea580727e6c386778b46698c

    • C:\Windows\System32\wbem\NetPeerDistCim_uninstall\unsecapp.exe

      Filesize

      783KB

      MD5

      fe3d6c88424163b80a62962709b16250

      SHA1

      e0c49ed67f31bfbae1269c112026a548fa4c023c

      SHA256

      a08c1dbff924e8ae6d84449d5e354fa1d0bb729a4a265515bce03f09edb68e3c

      SHA512

      d2225dc3bb4574bd891a9aef820d43e24d4b5c3c368855bc0edc834ce6b45473cbdcc70ac92189cbcc1bbaa680637a47182db14cb235ae2cbfbf7919ab5f0a13

    • memory/3580-17-0x000000001B710000-0x000000001B718000-memory.dmp

      Filesize

      32KB

    • memory/3580-94-0x00007FFD64E23000-0x00007FFD64E25000-memory.dmp

      Filesize

      8KB

    • memory/3580-4-0x0000000002D40000-0x0000000002D48000-memory.dmp

      Filesize

      32KB

    • memory/3580-5-0x0000000002D50000-0x0000000002D60000-memory.dmp

      Filesize

      64KB

    • memory/3580-6-0x000000001B530000-0x000000001B538000-memory.dmp

      Filesize

      32KB

    • memory/3580-7-0x000000001B540000-0x000000001B54C000-memory.dmp

      Filesize

      48KB

    • memory/3580-9-0x000000001B680000-0x000000001B68A000-memory.dmp

      Filesize

      40KB

    • memory/3580-8-0x000000001B660000-0x000000001B66A000-memory.dmp

      Filesize

      40KB

    • memory/3580-10-0x000000001B670000-0x000000001B678000-memory.dmp

      Filesize

      32KB

    • memory/3580-13-0x000000001B6C0000-0x000000001B6C8000-memory.dmp

      Filesize

      32KB

    • memory/3580-14-0x000000001B6B0000-0x000000001B6B8000-memory.dmp

      Filesize

      32KB

    • memory/3580-18-0x000000001B700000-0x000000001B708000-memory.dmp

      Filesize

      32KB

    • memory/3580-97-0x00007FFD64E20000-0x00007FFD658E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3580-3-0x0000000002C10000-0x0000000002C18000-memory.dmp

      Filesize

      32KB

    • memory/3580-15-0x000000001B6E0000-0x000000001B6E8000-memory.dmp

      Filesize

      32KB

    • memory/3580-20-0x000000001B830000-0x000000001B838000-memory.dmp

      Filesize

      32KB

    • memory/3580-19-0x000000001B6D0000-0x000000001B6D8000-memory.dmp

      Filesize

      32KB

    • memory/3580-16-0x000000001B6F0000-0x000000001B6F8000-memory.dmp

      Filesize

      32KB

    • memory/3580-21-0x000000001B840000-0x000000001B84C000-memory.dmp

      Filesize

      48KB

    • memory/3580-12-0x000000001B6A0000-0x000000001B6A8000-memory.dmp

      Filesize

      32KB

    • memory/3580-11-0x000000001B690000-0x000000001B698000-memory.dmp

      Filesize

      32KB

    • memory/3580-25-0x00007FFD64E20000-0x00007FFD658E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3580-26-0x00007FFD64E20000-0x00007FFD658E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3580-33-0x00007FFD64E20000-0x00007FFD658E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3580-2-0x00007FFD64E20000-0x00007FFD658E1000-memory.dmp

      Filesize

      10.8MB

    • memory/3580-22-0x000000001B850000-0x000000001B858000-memory.dmp

      Filesize

      32KB

    • memory/3580-1-0x00000000009F0000-0x0000000000ABA000-memory.dmp

      Filesize

      808KB

    • memory/3580-0-0x00007FFD64E23000-0x00007FFD64E25000-memory.dmp

      Filesize

      8KB