Analysis

  • max time kernel
    148s
  • max time network
    125s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    14/10/2026, 02:00

General

  • Target
    35FA07119FCEC6389BAC83D4FB7F4CD8.exe
  • Size 2.2MB
  • Sample261014-ce8dzsty9r
  • SHA256 c36ab8841d94861719e99c97d55a92c36d2a27c67e0d66a815dd31a50d2c538e
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: DcRat

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

  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Process spawned unexpected child process 24 IoCs

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

  • Executes dropped EXE 12 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 1 IoCs
  • Drops file in Program Files directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 2 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 10 IoCs
  • Suspicious use of WriteProcessMemory 8 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\35FA07119FCEC6389BAC83D4FB7F4CD8.exe
    "C:\Users\Admin\AppData\Local\Temp\35FA07119FCEC6389BAC83D4FB7F4CD8.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:276
    • C:\Users\Admin\AppData\Local\Temp\bnd_3dd324fb\DCRatBuild.exe
      "C:\Users\Admin\AppData\Local\Temp\bnd_3dd324fb\DCRatBuild.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:3408
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Portagent\e1zmNuk6PgHvGo3oCCD0Yo1C0Wi.vbe"
        3⤵
        • Executes a VBScript file via the Windows Script Host.
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2256
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Portagent\G3Qfs1kOHl20hun6eQCKvPdReFy.bat" "
          4⤵
          • Executes a command shell one-liner
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:3768
          • C:\Portagent\winbroker.exe
            "C:\Portagent\winbroker.exe"
            5⤵
            • Executes dropped EXE
            • Drops file in Program Files directory
            • Reads the TCP/IP host and domain name from the registry
            • Modifies registry class
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:2056
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\EW3OjitKRu.bat"
              6⤵
              • Executes a command shell one-liner
              • Suspicious use of WriteProcessMemory
              PID:5216
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:5888
                • C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe
                  "C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2968
      • C:\Users\Admin\AppData\Local\Temp\bnd_3dd324fb\FunSkyCollector.exe
        "C:\Users\Admin\AppData\Local\Temp\bnd_3dd324fb\FunSkyCollector.exe"
        2⤵
        • Executes dropped EXE
        PID:2896
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 9 /tr "'C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2944
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5928
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2408
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SecurityHealthSystrayS" /sc MINUTE /mo 5 /tr "'C:\Program Files\dotnet\host\fxr\6.0.27\SecurityHealthSystray.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2604
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SecurityHealthSystray" /sc ONLOGON /tr "'C:\Program Files\dotnet\host\fxr\6.0.27\SecurityHealthSystray.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5400
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SecurityHealthSystrayS" /sc MINUTE /mo 13 /tr "'C:\Program Files\dotnet\host\fxr\6.0.27\SecurityHealthSystray.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3772
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 8 /tr "'C:\Portagent\conhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1732
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Portagent\conhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1112
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\Portagent\conhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5864
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Windows.old\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:984
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows.old\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3892
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows.old\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1140
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 14 /tr "'C:\Users\Default User\cmd.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5028
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Users\Default User\cmd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5320
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 9 /tr "'C:\Users\Default User\cmd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4012
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Windows.old\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:980
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows.old\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5664
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Windows.old\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4272
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\Portagent\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1144
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Portagent\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2628
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Portagent\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4908
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Mail\dwm.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4348
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\Windows Mail\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2216
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Mail\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2404
    • C:\Portagent\conhost.exe
      "C:\Portagent\conhost.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2748
    • C:\Program Files\dotnet\host\fxr\6.0.27\SecurityHealthSystray.exe
      "C:\Program Files\dotnet\host\fxr\6.0.27\SecurityHealthSystray.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2108
    • C:\Windows.old\csrss.exe
      "C:\Windows.old\csrss.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3388
    • C:\Windows.old\RuntimeBroker.exe
      "C:\Windows.old\RuntimeBroker.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1472
    • C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe
      "C:\Program Files\dotnet\host\fxr\6.0.27\explorer.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2656
    • C:\Users\Default User\cmd.exe
      "C:\Users\Default User\cmd.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5916
    • C:\Program Files\Windows Mail\dwm.exe
      "C:\Program Files\Windows Mail\dwm.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1676
    • C:\Portagent\System.exe
      "C:\Portagent\System.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5788

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          G3Qfs1kOHl20hun6eQCKvPdReFy.bat

          • Path C:\Portagent\G3Qfs1kOHl20hun6eQCKvPdReFy.bat
          • Size 28B
          • SHA256 da95098b260b19107c2bde79353dfcada4efa91f9ab00926ffdee2f57a060e5e
          • MD5 SHA1 SHA512

          e1zmNuk6PgHvGo3oCCD0Yo1C0Wi.vbe

          • Path C:\Portagent\e1zmNuk6PgHvGo3oCCD0Yo1C0Wi.vbe
          • Size 213B
          • SHA256 2c164cb303436c840b2fc4bd93bfb91ce3417cb97b9d3bea64eb4776ae433f6f
          • MD5 SHA1 SHA512 TLSH

          winbroker.exe

          • Path C:\Portagent\winbroker.exe
          • Size 1.1MB
          • SHA256 c6ed1c7e207d9a18d5b8e0a009526da568295cb0de5a030c4607b34cb4edb02c
          • MD5 SHA1 SHA512 SSDEEP TLSH

          EW3OjitKRu.bat

          • Path C:\Users\Admin\AppData\Local\Temp\EW3OjitKRu.bat
          • Size 217B
          • SHA256 5d4f0fa5cfbc07585983f161337c3aa8a80c7c60bf2dfc5637340a2c0df91681
          • MD5 SHA1 SHA512 TLSH

          DCRatBuild.exe

          • Path C:\Users\Admin\AppData\Local\Temp\bnd_3dd324fb\DCRatBuild.exe
          • Size 1.4MB
          • SHA256 b028b2b4a6a39c51841a13e12f483b901339995a3ba40f46c63b4055d7a781a9
          • MD5 SHA1 SHA512 SSDEEP TLSH

          FunSkyCollector.exe

          • Path C:\Users\Admin\AppData\Local\Temp\bnd_3dd324fb\FunSkyCollector.exe
          • Size 718KB
          • SHA256 7aadeaa5e380ae6f1272164db24dd4e194850dc6268a96e7bc1231f36f46ddf6
          • MD5 SHA1 SHA512 SSDEEP TLSH

          memory/276-33-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/276-4-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/276-1-0x00000000003E0000-0x0000000000620000-memory.dmp

          memory/276-0-0x00007FFB5CCAF000-0x00007FFB5CCB0000-memory.dmp

          memory/2056-53-0x00000000022F0000-0x00000000022FC000-memory.dmp

          memory/2056-51-0x00000000022E0000-0x00000000022E8000-memory.dmp

          memory/2056-52-0x0000000002420000-0x0000000002436000-memory.dmp

          memory/2056-50-0x00000000022D0000-0x00000000022DE000-memory.dmp

          memory/2056-49-0x0000000000080000-0x0000000000198000-memory.dmp

          memory/2896-38-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-39-0x00000197DBE20000-0x00000197DBEDA000-memory.dmp

          memory/2896-42-0x00000197C29A0000-0x00000197C29AE000-memory.dmp

          memory/2896-40-0x00000197C2990000-0x00000197C2998000-memory.dmp

          memory/2896-43-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-44-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-45-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-41-0x00000197DB2D0000-0x00000197DB30E000-memory.dmp

          memory/2896-37-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-36-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-35-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-32-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-27-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-20-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp

          memory/2896-19-0x00000197C0B80000-0x00000197C0C38000-memory.dmp

          memory/2896-77-0x00007FFB5CB20000-0x00007FFB5D4C4000-memory.dmp