Overview

overview

10

Static

static

1

HK SEMI CO...pdf.js

windows7-x64

10

HK SEMI CO...pdf.js

windows10-2004-x64

10

Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-02-2023 11:00

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General

  • Target

    HK SEMI CORPORATION CO,,Ltd.pdf.js

  • Size

    3.6MB

  • MD5

    7c1b866122a8e513808e32caed12c6f6

  • SHA1

    fe31d17019b1faf1fa5a8c219bfbf1290d8c3423

  • SHA256

    6d492fc9630da1e571ef9953241ad9a594b7b702d7dfa033b06941d3b7f9f201

  • SHA512

    cd94ea8344923c1f5b007e10226ebc1bb7e1d1a1fcc0fdb0c3c14478ed5d7c78f9f1b1ac38aaa90567e49be5a5f9df320c68ad8de925620c82c5f9dd825de948

  • SSDEEP

    3072:HOcWWS20PtmUSfibfWZ17T7VE+NFlC7l75eGlGE32qXaj1slgD71dwMbb9rp6D9T:MG1SeC

Score
10/10
vjw0rmwshratpersistencetrojanworm

Malware Config

Extracted

Family

wshrat

C2

http://45.139.105.174:1604

Signatures

  • Vjw0rm

    Vjw0rm is a remote access trojan written in JavaScript.

    trojanwormvjw0rm
  • WSHRAT

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

    trojanwshrat
  • Blocklisted process makes network request 43 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 4 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). Likely ransomware behaviour.

  • Script User-Agent 29 IoCs

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

  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe "C:\Users\Admin\AppData\Local\Temp\HK SEMI CORPORATION CO,,Ltd.pdf.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:464
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\lTMNJJUZOW.js"
      2⤵
      • Blocklisted process makes network request
      • Drops startup file
      PID:2016

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\HK SEMI CORPORATION CO,,Ltd.pdf.js
    Filesize

    3.6MB

    MD5

    7c1b866122a8e513808e32caed12c6f6

    SHA1

    fe31d17019b1faf1fa5a8c219bfbf1290d8c3423

    SHA256

    6d492fc9630da1e571ef9953241ad9a594b7b702d7dfa033b06941d3b7f9f201

    SHA512

    cd94ea8344923c1f5b007e10226ebc1bb7e1d1a1fcc0fdb0c3c14478ed5d7c78f9f1b1ac38aaa90567e49be5a5f9df320c68ad8de925620c82c5f9dd825de948

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  • C:\Users\Admin\AppData\Roaming\lTMNJJUZOW.js
    Filesize

    346KB

    MD5

    ad59cac7b1286d1827b2fcc78a4d0520

    SHA1

    ba3b243c38e22175487e15c865e11aa4654e4f00

    SHA256

    eb442a007602f5f27c002bf0f7ab0e9b0f68bb9788cf338019fe856013c39a69

    SHA512

    6a459770989387cc1dfb8e1a8ea8baca669127a8bb7e0f97945ea3e0b53371da46f88d058c3005519b4f698d24e4ae64163dd588945205f12a01d4e6d2fee221

    Download Submit