Analysis

  • max time kernel
    141s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-11-2022 08:41

General

  • Target

    wynlog (1).js

  • Size

    188KB

  • MD5

    affa61f41e7abdd50ebec8a6179023dc

  • SHA1

    ca6d2ec065b722c8454c220cb6938f1cce5ce4c9

  • SHA256

    4dd4c87a2a5901ab66a358f41a71c5c0f2b068b8e741497878cf8754d5a63f33

  • SHA512

    98251a3ef43e86014cf51e091226748a7a094c433a38f51dc40745e71ccdfa69dafc168980bef4209d2ccc7b1c2279f4c92ad3bad262382fade35b928a678222

  • SSDEEP

    3072:yNQmvEznZ3Q0bamvbURCFeGK/6tHpEbIpklgVDSxGfmuZIY:yNfrMyRCFeGKMHpaAklgF2GuuZZ

Malware Config

Extracted

Family

wshrat

C2

http://45.139.105.174:3670

Signatures

  • WSHRAT

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

  • Blocklisted process makes network request 7 IoCs
  • Drops startup file 2 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • 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 6 IoCs

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

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe "C:\Users\Admin\AppData\Local\Temp\wynlog (1).js"
    1⤵
    • Blocklisted process makes network request
    • Drops startup file
    • Adds Run key to start application
    PID:1872

Network

MITRE ATT&CK Enterprise v6

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Downloads