Overview

overview

10

Static

static

1

Ref-23105_...pdf.js

windows7-x64

8

Ref-23105_...pdf.js

windows10-2004-x64

10

Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/10/2023, 13:01

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General

  • Target
    Ref-23105_Payment_Slip.pdf.js
  • Size 7KB
  • Sample231005-p88ytsda95
  • SHA256 ea9cb59ea8cbd8d1d5f279d32aec457ad469e7e81b03d34d7c34e5cc52195aae
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
wshratpersistencetrojan

Malware Config

Extracted

Family

  • wshrat

C2

  • http://chongmei33.publicvm.com:7045

Signatures

  • WSHRAT

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

    trojanwshrat
  • Blocklisted process makes network request 28 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Drops startup file 2 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).

  • Modifies registry class 2 IoCs
  • Script User-Agent 25 IoCs

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

  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\Ref-23105_Payment_Slip.pdf.js
    1⤵
    • Blocklisted process makes network request
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2020
    • C:\Windows\System32\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RUMBKX.js"
      2⤵
      • Checks computer location settings
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:4052
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\fGxgS.js"
        3⤵
        • Checks computer location settings
        • Drops startup file
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:4176
        • C:\Windows\System32\wscript.exe
          "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\fGxgS.js"
          4⤵
          • Blocklisted process makes network request
          • Drops startup file
          • Adds Run key to start application
          PID:2252

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        RUMBKX.js
        • Path C:\Users\Admin\AppData\Local\Temp\RUMBKX.js
        • Size 51KB
        • SHA256 69719809516edaab200680b7689e6c0c6541c9245f300babb5ee0a17abd82220
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        fGxgS.js
        • Path C:\Users\Admin\AppData\Local\Temp\fGxgS.js
        • Size 21KB
        • SHA256 6ea917b33aede59c617785f6abaa1299414e02e5e2408332c8e837d20f354aa0
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        fGxgS.js
        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\fGxgS.js
        • Size 21KB
        • SHA256 6ea917b33aede59c617785f6abaa1299414e02e5e2408332c8e837d20f354aa0
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        fGxgS.js
        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\fGxgS.js
        • Size 21KB
        • SHA256 6ea917b33aede59c617785f6abaa1299414e02e5e2408332c8e837d20f354aa0
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        fGxgS.js
        • Path C:\Users\Admin\AppData\Roaming\fGxgS.js
        • Size 21KB
        • SHA256 6ea917b33aede59c617785f6abaa1299414e02e5e2408332c8e837d20f354aa0
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download