Overview

overview

10

Static

static

InstallSli...der.js

windows7_x64

10

InstallSli...der.js

windows10_x64

10

Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10
  • submitted
    15/10/2020, 14:17

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General

  • Target
    InstallSlimPDFReader.js
  • Size 552KB
  • Sample201015-maq58vrepn
  • SHA256 ef487da7a8301df9dca1e74c58433912fca910fb06bc4c941e4c756ce5ff0712
  • MD5 SHA1 SHA512
Score
10/10
persistencetrojanwshrat

Malware Config

Signatures

  • WSHRAT

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

    trojanwshrat
  • Blacklisted process makes network request 21 IoCs
  • Executes dropped EXE 1 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.

  • Kills process with taskkill 1 IoCs
    evasion
  • Script User-Agent 19 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\InstallSlimPDFReader.js
    1⤵
    • Drops startup file
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:3984
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\InstallSlimPDFReader.js"
      2⤵
      • Blacklisted process makes network request
      • Drops startup file
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:3924
      • C:\Windows\system32\cmd.exe
        "C:\Windows\system32\cmd.exe" /c taskkill /F /IM kl-plugin.exe
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2184
        • C:\Windows\system32\taskkill.exe
          taskkill /F /IM kl-plugin.exe
          4⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:2460
      • C:\Users\Admin\AppData\Roaming\kl-plugin.exe
        "C:\Users\Admin\AppData\Roaming\kl-plugin.exe" blackid-43205.portmap.io 1118 "WSHRAT|1236D52C|GOHCSFBB|Admin|Microsoft Windows 10 Pro|plus|nan-av|false - 15/10/2020|JavaScript-v2.0|NL:Netherlands" 1
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetWindowsHookEx
        PID:2812

Network

        MITRE ATT&CK Enterprise v6

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        Downloads