Overview

overview

10

Static

static

10

MasonClient.exe

windows10-2004-x64

MasonClient.exe

windows10-ltsc_2021-x64

MasonClient.exe

windows11-21h2-x64

MasonClient.exe

windows11-ltsc_2024-x64

Sharing

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General

  • Target
    MasonClient.exe
  • Size 48KB
  • Sample260802-fvd2vstsfz
  • SHA256 0c133b862b888624ed150416ff508db4fd7ca456271140f5c4c6f7b43cdb7e27
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
neptuneratbootkitdefense_evasiondiscoveryexecutionpersistenceransomwaretrojan

Malware Config

Extracted

Family

  • neptunerat

C2

  • 24.tcp.cpolar.top:10236

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    uEZZrxy1VzemmhEt

  • rat_name

    MasonRAT

Targets

    • Target
      MasonClient.exe
    • Size 48KB
    • SHA256 0c133b862b888624ed150416ff508db4fd7ca456271140f5c4c6f7b43cdb7e27
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    bootkitdefense_evasiondiscoveryexecutionneptuneratpersistenceransomwaretrojan

    • Detects NeptuneRAT stealer

    • Family: NeptuneRAT, MasonRAT

      NeptuneRAT aka MasonRAT is a trojan written in C#.

      trojanneptunerat

    • Disables Task Manager via registry modification

      defense_evasion

    • Checks computer location settings

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

    • Executes dropped EXE

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

      bootkitpersistence

    • Drops file in System32 directory

    • Sets desktop wallpaper using registry

      ransomware
    behavioral1behavioral2behavioral3behavioral4

MITRE ATT&CK Enterprise v16

Tasks