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
    149s
  • max time network
    153s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    31/07/2026, 04:11

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General

  • Target
    MasonClient.exe
  • Size 48KB
  • Sample260731-er4yfaap3y
  • SHA256 13e951fdffaa05915adae0d1a859c649e9fa3e3d1b347db4852f60f001cf4400
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
executionneptuneratpersistencetrojan

Malware Config

Extracted

Family

  • neptunerat

C2

  • 24.tcp.cpolar.top:14042

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    QzNFKZLnuphkPQhS

  • rat_name

    MasonRAT

Signatures

  • Family: NeptuneRAT, MasonRAT

    NeptuneRAT aka MasonRAT is a trojan written in C#.

    trojanneptunerat
  • Detects NeptuneRAT stealer 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 use of AdjustPrivilegeToken 4 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⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2908
    • 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:2452
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    C:\Users\Admin\AppData\Roaming\MasonClient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4748
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4524
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1092

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        MasonClient.exe.log
        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonClient.exe.log
        • Size 654B
        • SHA256 d39a78fabca39532fcb85ce908781a75132e1bd01cc50a3b290dd87127837d63
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        MasonClient.exe
        • Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
        • Size 48KB
        • SHA256 13e951fdffaa05915adae0d1a859c649e9fa3e3d1b347db4852f60f001cf4400
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/2908-0-0x0000000000B40000-0x0000000000B52000-memory.dmp
        Download

        memory/2908-1-0x000000001B680000-0x000000001B690000-memory.dmp
        Download

        memory/2908-4-0x000000001B680000-0x000000001B690000-memory.dmp
        Download