Overview

overview

10

Static

static

Documento.PDF.js

windows7_x64

10

Documento.PDF.js

windows10_x64

10

Analysis

  • max time kernel
    145s
  • max time network
    155s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    06/08/2021, 17:00

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General

  • Target
    Documento.PDF.js
  • Size 673KB
  • Sample210806-e3avbbe4ka
  • SHA256 85e41bab0ec97c8110d96123d9c0d0c3431dbe4b388f5695baf5221e9d736718
  • MD5 SHA1 SHA512
Score
10/10
wshratpersistencesuricatatrojan

Malware Config

Signatures

  • WSHRAT

    WSHRAT is a variant of Houdini worm and has vbs and js variants.

    trojanwshrat
  • suricata: ET MALWARE WSHRAT CnC Checkin

    suricata: ET MALWARE WSHRAT CnC Checkin

    suricata
  • suricata: ET MALWARE Worm.VBS Dunihi/Houdini/H-Worm Checkin 1

    suricata: ET MALWARE Worm.VBS Dunihi/Houdini/H-Worm Checkin 1

    suricata
  • Blocklisted process makes network request 27 IoCs
  • Drops startup file 2 IoCs
  • Adds Run key to start application 2 TTPs 8 IoCs
    persistence
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Script User-Agent 26 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\Documento.PDF.js
    1⤵
    • Drops startup file
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:992
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\Documento.PDF.js"
      2⤵
      • Blocklisted process makes network request
      • Drops startup file
      • Adds Run key to start application
      PID:3768

Network

        MITRE ATT&CK Enterprise v6

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