Overview

overview

10

Static

static

3

MasonClient.exe

windows10-ltsc_2021-x64

10

MasonClient.exe

windows11-21h2-x64

10

MasonClient.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    MasonClient.exe
  • Size 78KB
  • Sample260926-rskbmsty3r
  • SHA256 7c5b994ebd20d7c3c68ce8a8813c2c1373a9adde4cad6e50c39cd1b4e1c26130
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
donutloaderneptuneratdiscoveryexecutionloaderpersistencetrojan

Malware Config

Extracted

Family

  • neptunerat

C2

  • xqxhzc1wmj.localto.net:2954:2954

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    jUHa9igX1Oajx6H4

  • rat_name

    MasonRAT

Targets

    • Target
      MasonClient.exe
    • Size 78KB
    • SHA256 7c5b994ebd20d7c3c68ce8a8813c2c1373a9adde4cad6e50c39cd1b4e1c26130
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    discoveryexecutiondonutloaderneptuneratloaderpersistencetrojan

    • Detects DonutLoader

      loader

    • Detects NeptuneRAT stealer

    • Family: DonutLoader

      DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.

      loaderdonutloader

    • 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

    behavioral1behavioral2behavioral3

MITRE ATT&CK Enterprise v16

Tasks