Overview

overview

10

Static

static

10

MasonClient.exe

windows10-ltsc_2021-x64

10

MasonClient.exe

windows10-2004-x64

10

MasonClient.exe

windows11-21h2-x64

10

MasonClient.exe

windows11-ltsc_2024-x64

10

Sharing

Copy URL Twitter E-mail

General

  • Target
    MasonClient.exe
  • Size 49KB
  • Sample261108-srtz5aac62
  • SHA256 441f4a638022c64a2297f8ce68d541f2eaa79f42879be03323b348ef8f7db4c4
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
neptuneratdefense_evasiondiscoveryexecutionpersistencetrojan

Malware Config

Targets

    • Target
      MasonClient.exe
    • Size 49KB
    • SHA256 441f4a638022c64a2297f8ce68d541f2eaa79f42879be03323b348ef8f7db4c4
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defense_evasiondiscoveryexecutionneptuneratpersistencetrojan

    • Detects NeptuneRAT stealer

    • Family: NeptuneRAT, MasonRAT

      NeptuneRAT aka MasonRAT is a trojan written in C#.

      trojanneptunerat

    • Checks computer location settings

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

    • Executes dropped EXE

    • Adds Run key to start application

      persistence

    • Contacts third-party web service commonly abused for C2

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

    behavioral1behavioral2behavioral3behavioral4

MITRE ATT&CK Enterprise v16

Tasks