Overview

overview

10

Static

static

10

MasonClien...mm.exe

windows10-2004-x64

10

MasonClien...mm.exe

windows10-ltsc_2021-x64

10

MasonClien...mm.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    31/07/2026, 22:45

Sharing

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General

  • Target
    MasonClientmmmmmmm.exe
  • Size 42KB
  • Sample260731-2plqeahg63
  • SHA256 73bf9c9a7f57a87a02130bf0bf92ff630e1a61d9dde5b964c373f98d39003998
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
executionneptuneratpersistencetrojan

Malware Config

Extracted

Family

  • neptunerat

Attributes
  • filename

    MasonUSB.exe

  • group

    MasonGroup

  • key

    KN74zbJh2G6NUPmO

  • localhost

    127.0.0.1:3012

  • rat_name

    MasonRAT

Signatures

  • Family: NeptuneRAT, MasonRAT

    NeptuneRAT aka MasonRAT is a trojan written in C#.

    trojanneptunerat
  • Detects NeptuneRAT stealer 2 IoCs
  • 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\MasonClientmmmmmmm.exe
    "C:\Users\Admin\AppData\Local\Temp\MasonClientmmmmmmm.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2460
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonClientmmmmmmm" /tr "C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe"
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:3668
  • C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
    C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2500
  • C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
    C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1524
  • C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
    C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4792

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        MasonClientmmmmmmm.exe.log
        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonClientmmmmmmm.exe.log
        • Size 654B
        • SHA256 e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        MasonClientmmmmmmm.exe
        • Path C:\Users\Admin\AppData\Roaming\MasonClientmmmmmmm.exe
        • Size 42KB
        • SHA256 73bf9c9a7f57a87a02130bf0bf92ff630e1a61d9dde5b964c373f98d39003998
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/2460-0-0x0000000000C90000-0x0000000000CA0000-memory.dmp
        Download

        memory/2460-2-0x000000001D220000-0x000000001D230000-memory.dmp
        Download

        memory/2460-6-0x000000001D220000-0x000000001D230000-memory.dmp
        Download