Analysis

  • max time kernel
    146s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-02-2023 23:56

General

  • Target

    insurance.es.js

  • Size

    97KB

  • MD5

    42d23b699c6dfbca209876a0f9a92bf9

  • SHA1

    df5f64e32bdc861bf3799dd679356e167fec48fb

  • SHA256

    d844fae5cdc61338bf5ec8f08804c844b50446dbaebf996643227e2c2967283f

  • SHA512

    8734b15942ffc5981d1b7da0d83560f51292cddab496cd62963dc70bdafeccb9a3e3008e452e12872ef443d0711451c22db5ab75390c915febc351b1067b5c53

  • SSDEEP

    192:nluzi75WbAZvu1hdh12cB5kw94tMa3dZYkVdPrv1kHWuuIVLk5/lWWWnazp6Lzj7:cz5KIy24jHuHWZqWWdLHKSq5dWBV

Malware Config

Extracted

Family

vjw0rm

C2

http://198.12.123.17:6040

Signatures

  • Vjw0rm

    Vjw0rm is a remote access trojan written in JavaScript.

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

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

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

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of WriteProcessMemory 2 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\insurance.es.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:972
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc minute /mo 30 /tn Skype /tr 'C:\Users\Admin\AppData\Local\Temp\insurance.es.js
      2⤵
      • Creates scheduled task(s)
      PID:2636

Network

MITRE ATT&CK Enterprise v6

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Downloads