Analysis

  • max time kernel
    150s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    27/09/2026, 03:51

General

  • Target
    2fb35c4ae7f69057974364351375bfb9.exe
  • Size 750KB
  • Sample260927-eelw4ayble
  • SHA256 fab9726534078808667e3e330bf24152919f74893067ec8cc40f21b0d025fbb8
  • 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 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Process spawned unexpected child process 15 IoCs

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

  • Disables Task Manager via registry modification
  • Executes a file named after a Windows system binary 1 TTPs 1 IoCs

    The file runs from a user directory while carrying the name of an executable that normally only exists in System32.

  • Executes dropped EXE 8 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 1 IoCs
  • Drops file in Program Files directory 2 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 4 IoCs

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

  • Modifies registry class 4 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 15 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 1 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\2fb35c4ae7f69057974364351375bfb9.exe
    "C:\Users\Admin\AppData\Local\Temp\2fb35c4ae7f69057974364351375bfb9.exe"
    1⤵
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:5564
    • C:\Users\Admin\AppData\Local\Temp\builds_store.json.cmd
      "C:\Users\Admin\AppData\Local\Temp\builds_store.json.cmd"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:3348
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\fontwin\XfnlBm.vbe"
        3⤵
        • Executes a VBScript file via the Windows Script Host.
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1240
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\fontwin\pWv5P.bat" "
          4⤵
          • Executes a command shell one-liner
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:4896
          • C:\Users\Admin\AppData\Roaming\fontwin\driverPerf.exe
            "C:\Users\Admin\AppData\Roaming\fontwin\driverPerf.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:1220
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\pQuxQFPn08.bat"
              6⤵
              • Executes a command shell one-liner
              • Suspicious use of WriteProcessMemory
              PID:5776
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:2776
                • C:\Recovery\WindowsRE\driverPerf.exe
                  "C:\Recovery\WindowsRE\driverPerf.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious use of AdjustPrivilegeToken
                  PID:720
            • C:\Windows\SysWOW64\reg.exe
              reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
              5⤵
              • System Location Discovery: System Language Discovery
              • Modifies registry key
              PID:1468
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:3820
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WUDFHostW" /sc MINUTE /mo 11 /tr "'C:\Users\All Users\WUDFHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3732
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WUDFHost" /sc ONLOGON /tr "'C:\Users\All Users\WUDFHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4340
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WUDFHostW" /sc MINUTE /mo 11 /tr "'C:\Users\All Users\WUDFHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1216
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5588
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4924
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:248
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files\Common Files\microsoft shared\OfficeSoftwareProtectionPlatform\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5316
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\OfficeSoftwareProtectionPlatform\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:6116
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files\Common Files\microsoft shared\OfficeSoftwareProtectionPlatform\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1748
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "driverPerfd" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\driverPerf.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1268
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "driverPerf" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\driverPerf.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5404
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "driverPerfd" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\driverPerf.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4796
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\Desktop\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2832
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Admin\Desktop\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1996
    • C:\Users\All Users\WUDFHost.exe
      "C:\Users\All Users\WUDFHost.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4100
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\Desktop\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3200
    • C:\Recovery\WindowsRE\sihost.exe
      "C:\Recovery\WindowsRE\sihost.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5100
    • C:\Users\Admin\Desktop\RuntimeBroker.exe
      "C:\Users\Admin\Desktop\RuntimeBroker.exe"
      1⤵
      • Executes a file named after a Windows system binary
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1140
    • C:\Recovery\WindowsRE\driverPerf.exe
      "C:\Recovery\WindowsRE\driverPerf.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4948
    • C:\Program Files\Common Files\microsoft shared\OfficeSoftwareProtectionPlatform\RuntimeBroker.exe
      "C:\Program Files\Common Files\microsoft shared\OfficeSoftwareProtectionPlatform\RuntimeBroker.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3124

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          builds_store.json.cmd

          • Path C:\Users\Admin\AppData\Local\Temp\builds_store.json.cmd
          • Size 1.2MB
          • SHA256 3292329c64143a3021cd35cbdd57ab9b1eaf0a36113deae7cd0c0a4731be76ca
          • MD5 SHA1 SHA512 SSDEEP TLSH

          pQuxQFPn08.bat

          • Path C:\Users\Admin\AppData\Local\Temp\pQuxQFPn08.bat
          • Size 201B
          • SHA256 fdcf50e4292f091f5418e2744d82830a19b44e842b9c8134412a3cc296772f7f
          • MD5 SHA1 SHA512 TLSH

          start_web_rat.py

          • Path C:\Users\Admin\AppData\Local\Temp\start_web_rat.py
          • Size 80KB
          • SHA256 15f38b73a349a20e8b1082795258554c28df505b5bc8285d9ec2e0e1b59f8e43
          • MD5 SHA1 SHA512 SSDEEP TLSH

          XfnlBm.vbe

          • Path C:\Users\Admin\AppData\Roaming\fontwin\XfnlBm.vbe
          • Size 196B
          • SHA256 b06bedcf846a9d231e329014e0aa4fd38800666977270a99aaebe8c419ce5f2f
          • MD5 SHA1 SHA512 TLSH

          driverPerf.exe

          • Path C:\Users\Admin\AppData\Roaming\fontwin\driverPerf.exe
          • Size 952KB
          • SHA256 bdc36e540db68e53969b5d277acce0464ffcaa3e2bf3e9bc96d1f54573c085ae
          • MD5 SHA1 SHA512 SSDEEP TLSH

          pWv5P.bat

          • Path C:\Users\Admin\AppData\Roaming\fontwin\pWv5P.bat
          • Size 146B
          • SHA256 928fcfe2245e4cc3b2556d8cf50871e35d8ab36bcaea69382a5add7546494148
          • MD5 SHA1 SHA512 TLSH

          memory/1220-32-0x0000000000480000-0x0000000000576000-memory.dmp

          memory/1220-35-0x00000000028E0000-0x00000000028EC000-memory.dmp

          memory/1220-34-0x0000000002610000-0x0000000002618000-memory.dmp

          memory/1220-33-0x0000000002600000-0x000000000260E000-memory.dmp

          memory/5564-4-0x00007FF921310000-0x00007FF921CB4000-memory.dmp

          memory/5564-16-0x00007FF921310000-0x00007FF921CB4000-memory.dmp

          memory/5564-0-0x00007FF92149F000-0x00007FF9214A0000-memory.dmp

          memory/5564-2-0x00007FF921310000-0x00007FF921CB4000-memory.dmp

          memory/5564-1-0x0000000000480000-0x0000000000542000-memory.dmp