Overview

overview

10

Static

static

10

MasonClient.exe

windows10-2004-x64

10

MasonClient.exe

windows10-ltsc_2021-x64

10

MasonClient.exe

windows11-21h2-x64

10

MasonClient.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    899s
  • max time network
    894s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    16/09/2026, 22:40

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General

  • Target
    MasonClient.exe
  • Size 49KB
  • Sample260916-2l2mfsweph
  • SHA256 3fd1677145bc6e50d8b9d26d5369360e84c9063edcf8aae7972ee029fd0d5e83
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwareexecutionneptuneratpersistenceransomwarespywaretrojan

Malware Config

Extracted

Family

  • neptunerat

C2

  • 188.209.211.120:8080

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    dzLRNpkgEBxWJ2Jm

  • rat_name

    MasonRAT

Signatures

  • Family: NeptuneRAT, MasonRAT

    NeptuneRAT aka MasonRAT is a trojan written in C#.

    trojanneptunerat
  • Detects NeptuneRAT stealer 2 IoCs
  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Executes dropped EXE 16 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • Enumerates connected drives 3 TTPs 2 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 62 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
    adwarespyware
  • Modifies registry class 40 IoCs
  • 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 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 61 IoCs
  • Suspicious use of FindShellTrayWindow 54 IoCs
  • Suspicious use of SendNotifyMessage 40 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 2 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
  • Uses Volume Shadow Copy WMI provider

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
    "C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2748
    • 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:5668
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    C:\Users\Admin\AppData\Roaming\MasonClient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4744
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:5556
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1560
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4644
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:460
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4556
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k GPSvcGroup
    1⤵
      PID:3920
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2520
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1732
    • C:\Windows\system32\sihost.exe
      sihost.exe
      1⤵
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:5140
      • C:\Windows\explorer.exe
        explorer.exe /LOADSAVEDWINDOWS
        2⤵
        • Boot or Logon Autostart Execution: Active Setup
        • Enumerates connected drives
        • Checks SCSI registry key(s)
        • Modifies Internet Explorer settings
        • Modifies registry class
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of SetWindowsHookEx
        PID:4412
    • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
      "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:5988
    • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
      "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:2900
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4996
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4080
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5656
    • C:\Windows\System32\SecurityHealthHost.exe
      \\?\C:\Windows\System32\SecurityHealthHost.exe {08728914-3F57-4D52-9E31-49DAECA5A80A} -Embedding
      1⤵
        PID:1124
      • C:\Users\Admin\AppData\Roaming\MasonClient.exe
        "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:6084
      • C:\Users\Admin\AppData\Roaming\MasonClient.exe
        "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4896
      • C:\Users\Admin\AppData\Roaming\MasonClient.exe
        "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:6040
      • C:\Users\Admin\AppData\Roaming\MasonClient.exe
        "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4840
      • C:\Users\Admin\AppData\Roaming\MasonClient.exe
        "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2624

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            prep_Activatable Class_Hermes_perf.cache
            • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
            • Size 607B
            • SHA256 be6b74e52e5eef1f1c27c0976bf3bf1bfa99958c00bbef2898a602f691be6dae
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            MasonClient.exe
            • Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
            • Size 49KB
            • SHA256 3fd1677145bc6e50d8b9d26d5369360e84c9063edcf8aae7972ee029fd0d5e83
            • MD5 SHA1 SHA512 SSDEEP TLSH
            Submit Download

            memory/2748-10-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/2748-1-0x0000000000A00000-0x0000000000A12000-memory.dmp
            Download

            memory/2748-2-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/2748-3-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/2748-4-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/2748-5-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/2748-0-0x00007FFDAB46F000-0x00007FFDAB470000-memory.dmp
            Download

            memory/2900-209-0x0000025FAC280000-0x0000025FAC6B4000-memory.dmp
            Download

            memory/4744-8-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/4744-9-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/4744-7-0x00007FFDAB2E0000-0x00007FFDABC84000-memory.dmp
            Download

            memory/5988-41-0x00000211801E0000-0x00000211802E0000-memory.dmp
            Download

            memory/5988-86-0x000002198B740000-0x000002198B760000-memory.dmp
            Download

            memory/5988-67-0x0000021181C90000-0x0000021181CB0000-memory.dmp
            Download

            memory/5988-53-0x0000021181E70000-0x0000021181F70000-memory.dmp
            Download

            memory/5988-52-0x0000021181A30000-0x0000021181A50000-memory.dmp
            Download