Overview

overview

10

Static

static

1

old outsta...PDF.js

windows7-x64

10

old outsta...PDF.js

windows10-2004-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/05/2023, 01:50

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General

  • Target
    old outstanding .PDF.js
  • Size 3.4MB
  • Sample230519-b89cpsdd4v
  • SHA256 344b8c7c7c4467f18c9b43447efafad8ac795c25b006465aeb1bd6097b50abb7
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
vjw0rmwshratpersistencetrojanworm

Malware Config

Extracted

Family

  • wshrat

C2

  • http://84.21.172.33:8895

Signatures

  • Vjw0rm

    Vjw0rm is a remote access trojan written in JavaScript.

    trojanwormvjw0rm
  • WSHRAT

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

    trojanwshrat
  • Blocklisted process makes network request 41 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 4 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
    persistence
  • Enumerates physical storage devices 1 TTPs

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

  • Script User-Agent 24 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\old outstanding .PDF.js"
    1⤵
    • Blocklisted process makes network request
    • Checks computer location settings
    • Drops startup file
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:4936
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\JbhvVxjFLu.js"
      2⤵
      • Blocklisted process makes network request
      • Drops startup file
      PID:4748

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        JbhvVxjFLu.js
        • Path C:\Users\Admin\AppData\Roaming\JbhvVxjFLu.js
        • Size 346KB
        • SHA256 f50dc6f0205c3d62f02ef2df694a1bb468b110efc83b38236747d1b40c3cbc33
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        old outstanding .PDF.js
        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\old outstanding .PDF.js
        • Size 3.4MB
        • SHA256 344b8c7c7c4467f18c9b43447efafad8ac795c25b006465aeb1bd6097b50abb7
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download