General

  • Target
    798.exe
  • Size 250KB
  • Sample261024-k568lsef57
  • SHA256 2f5aecb75a4a9848101551aa300480462b07b1b5ffd54e4ef0d31b90965a2cd9
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • neptunerat

C2
  • 193.161.193.99:45108

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    I3ujeNhtTGMSOz0g

  • rat_name

    MasonRAT

Targets

    • Target
      798.exe
    • Size 250KB
    • SHA256 2f5aecb75a4a9848101551aa300480462b07b1b5ffd54e4ef0d31b90965a2cd9
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Detects DonutLoader

    • 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.

    • Family: NeptuneRAT, MasonRAT

      NeptuneRAT aka MasonRAT is a trojan written in C#.

    • Modifies visibility of hidden/system files in Explorer

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Checks computer location settings

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

    • Executes a file named after a Windows system binary

      The file runs from a user directory while carrying the name of an executable that normally only exists in System32.

    • Executes dropped EXE

    • Adds Run key to start application

    • Contacts third-party web service commonly abused for C2

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

MITRE ATT&CK Enterprise v16

Tasks