Overview

overview

10

Static

static

10

MasonC1111...nt.exe

windows10-2004-x64

10

MasonC1111...nt.exe

windows10-ltsc_2021-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260911-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    09/11/2026, 06:51

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General

  • Target
    MasonC1111111111111111111111lient.exe
  • Size 48KB
  • Sample261109-hmzppsax6v
  • SHA256 f7237acfe84e47e71a284a0e0853cf6270aa0bc7588282cda0bb9ef4707809a8
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
discoveryexecutionneptuneratpersistencetrojan

Malware Config

Extracted

Family

  • neptunerat

C2

  • 31.tcp.cpolar.top:10754

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    W843ZgAioNkcolIx

  • 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).

  • 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
  • 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\MasonC1111111111111111111111lient.exe
    "C:\Users\Admin\AppData\Local\Temp\MasonC1111111111111111111111lient.exe"
    1⤵
    • Checks computer location settings
    • Reads the TCP/IP host and domain name from the registry
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3172
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonC1111111111111111111111lient" /tr "C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe"
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2860
  • C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe
    C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3604
  • C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe
    "C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1956
  • C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe
    "C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3520

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        MasonC1111111111111111111111lient.exe.log
        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonC1111111111111111111111lient.exe.log
        • Size 654B
        • SHA256 d39a78fabca39532fcb85ce908781a75132e1bd01cc50a3b290dd87127837d63
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        MasonC1111111111111111111111lient.exe
        • Path C:\Users\Admin\AppData\Roaming\MasonC1111111111111111111111lient.exe
        • Size 48KB
        • SHA256 f7237acfe84e47e71a284a0e0853cf6270aa0bc7588282cda0bb9ef4707809a8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/3172-0-0x0000000000A90000-0x0000000000AA2000-memory.dmp
        Download

        memory/3172-1-0x000000001B850000-0x000000001B860000-memory.dmp
        Download

        memory/3172-4-0x000000001B850000-0x000000001B860000-memory.dmp
        Download