Overview

overview

10

Static

static

3

WinRAR.exe

windows10-2004-x64

10

WinRAR.exe

windows11-21h2-x64

10

Sharing

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General

  • Target
    WinRAR.exe
  • Size 1.9MB
  • Sample260524-sr2d7sg15q
  • SHA256 5d00a8d861b0ef150cfd2cc298f4c01a1006ded8144a9b0b956fc3cb267397c2
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
donutloaderfatalratvalleyrat_s2backdoordiscoveryinfostealerloaderratstealertrojan

Malware Config

Extracted

Family

  • valleyrat_s2

Version

  • 1.0

C2

  • 156.245.235.131:443

  • 127.0.0.1:8888

  • 127.0.0.1:80

Attributes
  • campaign_date

    2026. 3.22

Targets

    • Target
      WinRAR.exe
    • Size 1.9MB
    • SHA256 5d00a8d861b0ef150cfd2cc298f4c01a1006ded8144a9b0b956fc3cb267397c2
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    backdoordiscoverydonutloaderfatalratvalleyrat_s2infostealerloaderratstealertrojan

    • Detects DonutLoader

      loader

    • Family: DonutLoader

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

      loaderdonutloader

    • Family: FatalRat

      FatalRat is a modular infostealer family written in C++ first appearing in June 2021.

      stealertrojanfatalrat

    • Family: ValleyRat

      ValleyRat stage2 is a backdoor written in C++.

      backdoorvalleyrat_s2

    • Fatal Rat payload

      ratinfostealer

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks