Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-10-2022 13:33

General

  • Target

    PO CF004303.js

  • Size

    52KB

  • MD5

    4a70919d125ea1c01065710550d3cf6a

  • SHA1

    03c636a5603d3781f25248ed761316af876f0538

  • SHA256

    87c02c61d4cf74ebabc28dab3d1f91593a87eebd31f97d0913967bf975f6d62b

  • SHA512

    28d5d3dc078c317eb21c7685a8d6b00c86ea5970651a675e158db5e28f4ddb7f7a4a6979d7cb32ca3c29a430b28276195f9213a3852f51cba5a639301b2afdb3

  • SSDEEP

    768:pMgbzZ2OkxKvwNi/3HgFBgzZhnooQT1DLsjg7EjDBNSamcnZMqX3LaWJIo/K:jsKdA3gzw31DygKSamQjnWWl/K

Malware Config

Extracted

Family

wshrat

C2

http://37.0.14.195:1604

Signatures

  • Vjw0rm

    Vjw0rm is a remote access trojan written in JavaScript.

  • WSHRAT

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

  • Blocklisted process makes network request 41 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Drops startup file 5 IoCs
  • Adds Run key to start application 2 TTPs 8 IoCs
  • 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 6 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe "C:\Users\Admin\AppData\Local\Temp\PO CF004303.js"
    1⤵
    • Checks computer location settings
    • Drops startup file
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:1556
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\YYELvrJUmX.js"
      2⤵
      • Blocklisted process makes network request
      • Drops startup file
      PID:4916
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\PO CF004303.js"
      2⤵
      • Blocklisted process makes network request
      • Checks computer location settings
      • Drops startup file
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:3620
      • C:\Windows\System32\wscript.exe
        "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\YYELvrJUmX.js"
        3⤵
        • Blocklisted process makes network request
        • Drops startup file
        PID:1948

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PO CF004303.js

    Filesize

    52KB

    MD5

    4a70919d125ea1c01065710550d3cf6a

    SHA1

    03c636a5603d3781f25248ed761316af876f0538

    SHA256

    87c02c61d4cf74ebabc28dab3d1f91593a87eebd31f97d0913967bf975f6d62b

    SHA512

    28d5d3dc078c317eb21c7685a8d6b00c86ea5970651a675e158db5e28f4ddb7f7a4a6979d7cb32ca3c29a430b28276195f9213a3852f51cba5a639301b2afdb3

  • C:\Users\Admin\AppData\Roaming\PO CF004303.js

    Filesize

    52KB

    MD5

    4a70919d125ea1c01065710550d3cf6a

    SHA1

    03c636a5603d3781f25248ed761316af876f0538

    SHA256

    87c02c61d4cf74ebabc28dab3d1f91593a87eebd31f97d0913967bf975f6d62b

    SHA512

    28d5d3dc078c317eb21c7685a8d6b00c86ea5970651a675e158db5e28f4ddb7f7a4a6979d7cb32ca3c29a430b28276195f9213a3852f51cba5a639301b2afdb3

  • C:\Users\Admin\AppData\Roaming\YYELvrJUmX.js

    Filesize

    10KB

    MD5

    8347dbb77c8799b4c7cad9928702f1d7

    SHA1

    e87231a42abb961ec0ef459ddee48331a90275d5

    SHA256

    87d9d47c5591a8d90f1fd3ebc421135dfad6ef97a7b454fb7d034b0f948964df

    SHA512

    a0ebdeb58a5446fc3696090f69043be6244af6cdada71d77380120e9f23ce4bafae2e105f1df6c0d502f419a5718d3498a9329e417c27e109c85ba04c4adc19f

  • C:\Users\Admin\AppData\Roaming\YYELvrJUmX.js

    Filesize

    10KB

    MD5

    8347dbb77c8799b4c7cad9928702f1d7

    SHA1

    e87231a42abb961ec0ef459ddee48331a90275d5

    SHA256

    87d9d47c5591a8d90f1fd3ebc421135dfad6ef97a7b454fb7d034b0f948964df

    SHA512

    a0ebdeb58a5446fc3696090f69043be6244af6cdada71d77380120e9f23ce4bafae2e105f1df6c0d502f419a5718d3498a9329e417c27e109c85ba04c4adc19f