Overview

overview

10

Static

static

10

MasonClient.exe

windows10-2004-x64

10

MasonClient.exe

windows11-ltsc_2024-x64

10

Analysis

  • user interaction
    yes
  • max time kernel
    329s
  • max time network
    333s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    03/08/2026, 17:14

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General

  • Target
    MasonClient.exe
  • Size 49KB
  • Sample260803-vr7mbstfpf
  • SHA256 a4ecb93f62b8074f13b959e8cbb9d6b31a80db3e5fa989e41f1c0a23a6b09480
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
executionneptuneratpersistencetrojan

Malware Config

Extracted

Family

  • neptunerat

C2

  • abuk-62003.portmap.host:62003

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    hPhjLBptF0qbmZhf

  • 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 7 IoCs
  • Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Enumerates physical storage devices 1 TTPs

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

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

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

  • Modifies registry class 1 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 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 14 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 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:1816
    • 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:3444
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    C:\Users\Admin\AppData\Roaming\MasonClient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3980
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    C:\Users\Admin\AppData\Roaming\MasonClient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4368
  • C:\Users\Admin\AppData\Roaming\MasonClient.exe
    C:\Users\Admin\AppData\Roaming\MasonClient.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:1300
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /0
    1⤵
    • Checks SCSI registry key(s)
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:4236
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4476
    • C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
      "C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4800
    • C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
      "C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2336
    • C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
      "C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1368
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      C:\Users\Admin\AppData\Roaming\MasonClient.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1972
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      C:\Users\Admin\AppData\Roaming\MasonClient.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1136
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      C:\Users\Admin\AppData\Roaming\MasonClient.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1920
    • C:\Users\Admin\AppData\Roaming\MasonClient.exe
      C:\Users\Admin\AppData\Roaming\MasonClient.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4976

    Network

          MITRE ATT&CK Enterprise v16

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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 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          MasonClient.exe
          • Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
          • Size 49KB
          • SHA256 a4ecb93f62b8074f13b959e8cbb9d6b31a80db3e5fa989e41f1c0a23a6b09480
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/1816-0-0x0000000000D50000-0x0000000000D62000-memory.dmp
          Download

          memory/1816-2-0x000000001B9E0000-0x000000001B9F0000-memory.dmp
          Download

          memory/1816-6-0x000000001B9E0000-0x000000001B9F0000-memory.dmp
          Download

          memory/4236-11-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-10-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-12-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-17-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-22-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-21-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-20-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-19-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-18-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download

          memory/4236-16-0x000001F8EEDB0000-0x000001F8EEDB1000-memory.dmp
          Download