Overview

overview

10

Static

static

10

MasonClient.exe

windows11-ltsc_2024-x64

10

Analysis

  • user interaction
    yes
  • max time kernel
    900s
  • max time network
    903s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    07/11/2026, 15:20

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General

  • Target
    MasonClient.exe
  • Size 48KB
  • Sample261107-sq2nksfc49
  • SHA256 264187793d322ae30bd8d1cb41d8c456fd5ca8e8f1321bb97f6b68dc6314d7cd
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defense_evasiondiscoveryexecutionneptuneratpersistencetrojan

Malware Config

Signatures

  • Family: NeptuneRAT, MasonRAT

    NeptuneRAT aka MasonRAT is a trojan written in C#.

    trojanneptunerat
  • Detects NeptuneRAT stealer 2 IoCs
  • Executes dropped EXE 16 IoCs
  • Enumerates video capture drivers 2 TTPs 1 IoCs

    Queries the legacy Video for Windows capture drivers. This is commonly abused by RATs to check for available webcams on the system before reporting to their C2.

    discoverydefense_evasion
  • Enumerates physical storage devices 1 TTPs

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

  • 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.

    discovery
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 20 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 1 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
    "C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
    1⤵
    • Enumerates video capture drivers
    • Reads the TCP/IP host and domain name from the registry
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5296
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4720
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    C:\Users\Admin\AppData\Roaming\MasonClient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4296
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:5796
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k GPSvcGroup
    1⤵
      PID:3260
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:1876
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1080
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4488
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2720
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1900
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:6008
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4784
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2428
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5668
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4456
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3492
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k GPSvcGroup
      1⤵
        PID:2876
      • C:\Windows\System32\SecurityHealthHost.exe
        \\?\C:\Windows\System32\SecurityHealthHost.exe {08728914-3F57-4D52-9E31-49DAECA5A80A} -Embedding
        1⤵
          PID:1280
        • C:\Users\Admin\AppData\Roaming\MasonClient.exe
          "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1680
        • C:\Users\Admin\AppData\Roaming\MasonClient.exe
          "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:5172
        • C:\Users\Admin\AppData\Roaming\MasonClient.exe
          "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:5620
        • C:\Users\Admin\AppData\Roaming\MasonClient.exe
          "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1188

        Network

              MITRE ATT&CK Enterprise v16

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              Downloads

              MasonClient.exe
              • Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
              • Size 48KB
              • SHA256 264187793d322ae30bd8d1cb41d8c456fd5ca8e8f1321bb97f6b68dc6314d7cd
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              memory/1876-10-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
              Download

              memory/1876-16-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
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              memory/1876-18-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
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              memory/1876-20-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
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              memory/1876-17-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
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              memory/1876-21-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
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              memory/1876-19-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
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              memory/1876-12-0x00000284E09E0000-0x00000284E09E1000-memory.dmp
              Download

              memory/5296-4-0x00007FFFC47B0000-0x00007FFFC5154000-memory.dmp
              Download

              memory/5296-8-0x00007FFFC47B0000-0x00007FFFC5154000-memory.dmp
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              memory/5296-6-0x00007FFFC47B0000-0x00007FFFC5154000-memory.dmp
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              memory/5296-5-0x00007FFFC47B0000-0x00007FFFC5154000-memory.dmp
              Download

              memory/5296-1-0x0000000000EC0000-0x0000000000ED2000-memory.dmp
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              memory/5296-3-0x00007FFFC47B0000-0x00007FFFC5154000-memory.dmp
              Download

              memory/5296-2-0x00007FFFC47B0000-0x00007FFFC5154000-memory.dmp
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              memory/5296-0-0x00007FFFC493F000-0x00007FFFC4940000-memory.dmp
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