Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    09/08/2026, 22:11

General

  • Target
    Chainperfnet.exe
  • Size 1.1MB
  • Sample260809-14bnbael7z
  • SHA256 fa245486b3fd0ed56fc169c0c57cad8b5a8390bd4e6b04765148cb5d2d8e0f2e
  • 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 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Process spawned unexpected child process 21 IoCs

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

  • Executes dropped EXE 7 IoCs
  • Looks up external IP address via web service 1 TTPs 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Executes a VBScript file via the Windows Script Host. 1 TTPs 2 IoCs
  • SmartAssembly .NET packer 1 IoCs

    Detects SmartAssembly .NET packer.

  • Drops file in Program Files directory 8 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 21 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 27 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 3 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\Chainperfnet.exe
    "C:\Users\Admin\AppData\Local\Temp\Chainperfnet.exe"
    1⤵
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4168
    • C:\Program Files\WindowsPowerShell\Modules\Microsoft.PowerShell.Operation.Validation\1.0.1\Diagnostics\RuntimeBroker.exe
      "C:\Program Files\WindowsPowerShell\Modules\Microsoft.PowerShell.Operation.Validation\1.0.1\Diagnostics\RuntimeBroker.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1968
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\Application Data\csrss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3684
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Admin\Application Data\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5748
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Users\Admin\Application Data\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1256
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\csrss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2544
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5672
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1980
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "ChainperfnetC" /sc MINUTE /mo 10 /tr "'C:\Users\Default User\Chainperfnet.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4376
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Chainperfnet" /sc ONLOGON /tr "'C:\Users\Default User\Chainperfnet.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3296
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "ChainperfnetC" /sc MINUTE /mo 10 /tr "'C:\Users\Default User\Chainperfnet.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4236
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "ShellHostS" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\ShellHost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4824
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "ShellHost" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\ShellHost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:6044
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "ShellHostS" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\ShellHost.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 7 /tr "'C:\Program Files\WindowsPowerShell\Modules\Microsoft.PowerShell.Operation.Validation\1.0.1\Diagnostics\RuntimeBroker.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3532
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\WindowsPowerShell\Modules\Microsoft.PowerShell.Operation.Validation\1.0.1\Diagnostics\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5460
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files\WindowsPowerShell\Modules\Microsoft.PowerShell.Operation.Validation\1.0.1\Diagnostics\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1544
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Users\Public\Music\RuntimeBroker.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5400
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Public\Music\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5908
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Music\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3740
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 9 /tr "'C:\Program Files\Java\jre-1.8\bin\dtplugin\sppsvc.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1232
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files\Java\jre-1.8\bin\dtplugin\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5132
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 12 /tr "'C:\Program Files\Java\jre-1.8\bin\dtplugin\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1780
  • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\csrss.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\csrss.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4668
  • C:\Users\Admin\Application Data\csrss.exe
    "C:\Users\Admin\Application Data\csrss.exe"
    1⤵
    • Executes dropped EXE
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2112
    • C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\f9ff4cec-16b1-4def-811d-bb9f2d6b21c1.vbs"
      2⤵
      • Executes a VBScript file via the Windows Script Host.
      PID:460
    • C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\d942752c-50fe-4b32-974c-a066f0f727a8.vbs"
      2⤵
      • Executes a VBScript file via the Windows Script Host.
      PID:1224
  • C:\Users\Default User\Chainperfnet.exe
    "C:\Users\Default User\Chainperfnet.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2800
  • C:\Program Files (x86)\MSBuild\Microsoft\ShellHost.exe
    "C:\Program Files (x86)\MSBuild\Microsoft\ShellHost.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2012
  • C:\Program Files\Java\jre-1.8\bin\dtplugin\sppsvc.exe
    "C:\Program Files\Java\jre-1.8\bin\dtplugin\sppsvc.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1700
  • C:\Users\Public\Music\RuntimeBroker.exe
    "C:\Users\Public\Music\RuntimeBroker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1208
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k GPSvcGroup
    1⤵
      PID:1672

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          csrss.exe

          • Path C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\csrss.exe
          • Size 1.1MB
          • SHA256 fa245486b3fd0ed56fc169c0c57cad8b5a8390bd4e6b04765148cb5d2d8e0f2e
          • MD5 SHA1 SHA512 SSDEEP TLSH

          d942752c-50fe-4b32-974c-a066f0f727a8.vbs

          • Path C:\Users\Admin\AppData\Local\Temp\d942752c-50fe-4b32-974c-a066f0f727a8.vbs
          • Size 493B
          • SHA256 e954484e09c24d54b342453d65a207dd17a0659f569d5a533ed644b671de2b27
          • MD5 SHA1 SHA512 TLSH

          f9ff4cec-16b1-4def-811d-bb9f2d6b21c1.vbs

          • Path C:\Users\Admin\AppData\Local\Temp\f9ff4cec-16b1-4def-811d-bb9f2d6b21c1.vbs
          • Size 717B
          • SHA256 05aba61aba922bbe6f3a5720ea852fcd62f021c261b51a0784cf123b93dc319e
          • MD5 SHA1 SHA512 TLSH

          memory/4168-11-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-15-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-5-0x0000000000F80000-0x0000000000F8E000-memory.dmp

          memory/4168-9-0x00000000028D0000-0x00000000028DC000-memory.dmp

          memory/4168-8-0x0000000000FD0000-0x0000000000FDA000-memory.dmp

          memory/4168-7-0x0000000000FB0000-0x0000000000FC6000-memory.dmp

          memory/4168-6-0x0000000000F90000-0x0000000000F98000-memory.dmp

          memory/4168-0-0x00007FFAA609F000-0x00007FFAA60A0000-memory.dmp

          memory/4168-13-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-4-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-16-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-17-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-20-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-21-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-22-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-19-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-3-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-32-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-2-0x00007FFAA5F10000-0x00007FFAA68B4000-memory.dmp

          memory/4168-1-0x0000000000590000-0x00000000006B2000-memory.dmp