Analysis

  • max time kernel
    108s
  • max time network
    110s
  • platform
    windows10-1703_x64
  • resource
    win10-20230220-en
  • resource tags

    arch:x64arch:x86image:win10-20230220-enlocale:en-usos:windows10-1703-x64system
  • submitted
    23-02-2023 16:06

General

  • Target

    temp.js

  • Size

    6KB

  • MD5

    71838ec02373c35bc9217ab58cd6b6a1

  • SHA1

    68ed796c91ff5d04da869c6b6dd0e0bfda0a769c

  • SHA256

    1939367b5a1548e8af432cdbf026980006ddf37325482602303ddfaf27690b31

  • SHA512

    f36709240f111bf08ef43208899cd4b451fc951525543e125294ae17b77e3d15fd363669d0a2cab73f696f2a1de1e8f89ee105546ca4cbde402d445d2348ce5d

  • SSDEEP

    192:MZVhB3qeNJ82T2ZvfLaTRDLiUFOvewELaZL+URZn7iixK23WR8IKrzv:2VHa+JafGRDGUFOvewEyL+URl7i9TK7H

Malware Config

Extracted

Family

vjw0rm

C2

http://js9300.duckdns.org:9300

Signatures

  • Vjw0rm

    Vjw0rm is a remote access trojan written in JavaScript.

  • Blocklisted process makes network request 1 IoCs
  • 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\temp.js
    1⤵
    • Blocklisted process makes network request
    • Drops startup file
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:2488
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Local\Temp\temp.js
      2⤵
      • Creates scheduled task(s)
      PID:3468

Network

MITRE ATT&CK Enterprise v6

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Downloads