Resubmissions

15/04/2026, 16:14

260415-tp3d6afx7v10

15/04/2026, 15:19

260415-sqcdpabw5n10

Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    15/04/2026, 15:19

General

  • Target
    xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe
  • Size 1.2MB
  • Sample260415-sqcdpabw5n
  • SHA256 b1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947
  • 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 8 IoCs
  • Drops file in Program Files directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 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 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 4 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\xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe
    "C:\Users\Admin\AppData\Local\Temp\xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4380
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\containerServerruntimeBrokercrt\uIY3HQ5y.vbe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3552
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\containerServerruntimeBrokercrt\WCtpv9M9MG6RIlnUYWV871.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2448
        • C:\containerServerruntimeBrokercrt\surrogatemonitorDll.exe
          "C:\containerServerruntimeBrokercrt\surrogatemonitorDll.exe"
          4⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4252
          • C:\containerServerruntimeBrokercrt\sihost.exe
            "C:\containerServerruntimeBrokercrt\sihost.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1436
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1852
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2156
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2188
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3888
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5040
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3388
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Users\Public\AccountPictures\csrss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3796
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Public\AccountPictures\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2148
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Users\Public\AccountPictures\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3940
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SearchHostS" /sc MINUTE /mo 9 /tr "'C:\containerServerruntimeBrokercrt\SearchHost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4284
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SearchHost" /sc ONLOGON /tr "'C:\containerServerruntimeBrokercrt\SearchHost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2480
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SearchHostS" /sc MINUTE /mo 6 /tr "'C:\containerServerruntimeBrokercrt\SearchHost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1520
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2764
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2496
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.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 "sihosts" /sc MINUTE /mo 7 /tr "'C:\containerServerruntimeBrokercrt\sihost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2232
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\containerServerruntimeBrokercrt\sihost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:436
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\containerServerruntimeBrokercrt\sihost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3004
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3216
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.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 "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:448
  • C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe
    "C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1212
  • C:\Users\Public\AccountPictures\csrss.exe
    "C:\Users\Public\AccountPictures\csrss.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2976
  • C:\containerServerruntimeBrokercrt\SearchHost.exe
    "C:\containerServerruntimeBrokercrt\SearchHost.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2684
  • C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe
    "C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3864
  • C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe
    "C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2564
  • C:\Recovery\WindowsRE\RuntimeBroker.exe
    "C:\Recovery\WindowsRE\RuntimeBroker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3812

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        RuntimeBroker.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.exe.log
        • Size 1KB
        • SHA256 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
        • MD5 SHA1 SHA512 TLSH

        WCtpv9M9MG6RIlnUYWV871.bat

        • Path C:\containerServerruntimeBrokercrt\WCtpv9M9MG6RIlnUYWV871.bat
        • Size 60B
        • SHA256 262289a07fcf5cddfcb51bd19b3fac41165073fe87c0d15073167caf4265d9d1
        • MD5 SHA1 SHA512 TLSH

        surrogatemonitorDll.exe

        • Path C:\containerServerruntimeBrokercrt\surrogatemonitorDll.exe
        • Size 827KB
        • SHA256 b41563730b142a24c52759dc817580cf98f0ecfd0a9818eb2fdd429e80758fe4
        • MD5 SHA1 SHA512 SSDEEP TLSH

        uIY3HQ5y.vbe

        • Path C:\containerServerruntimeBrokercrt\uIY3HQ5y.vbe
        • Size 230B
        • SHA256 8800b721ab1bd9d8bb493a23d55c84c7787efe249b923dfef7e5252e05ab0092
        • MD5 SHA1 SHA512 TLSH

        memory/1212-57-0x0000000000AB0000-0x0000000000AB8000-memory.dmp

        memory/1212-56-0x0000000000AA0000-0x0000000000AAC000-memory.dmp

        memory/1212-55-0x000000001B210000-0x000000001B2FA000-memory.dmp

        memory/1436-79-0x000000001BD00000-0x000000001BDEA000-memory.dmp

        memory/1436-81-0x000000001B5F0000-0x000000001B5F8000-memory.dmp

        memory/1436-80-0x00000000011F0000-0x00000000011FC000-memory.dmp

        memory/2564-75-0x000000001BDB0000-0x000000001BE9A000-memory.dmp

        memory/2564-76-0x000000001B7B0000-0x000000001B7BC000-memory.dmp

        memory/2564-77-0x000000001B810000-0x000000001B818000-memory.dmp

        memory/2684-64-0x0000000000990000-0x000000000099C000-memory.dmp

        memory/2684-63-0x000000001B430000-0x000000001B51A000-memory.dmp

        memory/2684-65-0x0000000000B40000-0x0000000000B48000-memory.dmp

        memory/2976-62-0x000000001AFF0000-0x000000001AFF8000-memory.dmp

        memory/2976-61-0x000000001AFE0000-0x000000001AFEC000-memory.dmp

        memory/2976-60-0x000000001C890000-0x000000001C97A000-memory.dmp

        memory/3552-9-0x0000000003180000-0x0000000003782000-memory.dmp

        memory/3812-71-0x000000001C700000-0x000000001C7EA000-memory.dmp

        memory/3812-73-0x000000001C7F0000-0x000000001C7F8000-memory.dmp

        memory/3812-72-0x000000001AFF0000-0x000000001AFFC000-memory.dmp

        memory/3864-68-0x0000000001770000-0x000000000177C000-memory.dmp

        memory/3864-69-0x0000000001780000-0x0000000001788000-memory.dmp

        memory/3864-67-0x000000001BF90000-0x000000001C07A000-memory.dmp

        memory/4252-39-0x000000001BF00000-0x000000001BFEA000-memory.dmp

        memory/4252-41-0x0000000002E80000-0x0000000002E88000-memory.dmp

        memory/4252-40-0x0000000002E70000-0x0000000002E7C000-memory.dmp

        memory/4252-13-0x0000000000CB0000-0x0000000000D86000-memory.dmp