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Matrix Ransomware (<Original Filename>.<Original Extension> → [KOK08@protonmail.com ].<Random>-<Random>.KOK08)

  • Distribution Method : Unknown
 
  • MD5 : ca7274acc96e734f2f7e0c292e2bd7a6
 
  • Major Detection Name : Trojan-Ransom.Win32.Matrix.ry (Kaspersky), Ransom-Matrix.a (McAfee)
 
  • Encrypted File Pattern : <Original Filename>.<Original Extension> → [KOK08@protonmail.com ].<Random>-<Random>.KOK08
 
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AppData\Roaming\<Random>.bat
     - C:\Users\%UserName%\AppData\Roaming\<Random>.vbs
     - C:\Windows\System32\Tasks\DSHCA
 
  • Payment Instruction File : #KOK08_README#.rtf
 
  • Major Characteristics :
     - Offline Encryption
     - Reruns by adding "DSHCA" in Task Scheduler to disable system restore (vssadmin Delete Shadows /All /Quiet, wmic SHADOWCOPY DELETE, bcdedit /set {default} recoveryenabled No, bcdedit /set {default} bootstatuspolicy ignoreallfailures) for every 5 minutes.
     - Changes desktop background (C:\Users\%UserName%\AppData\Roaming\<Random>.bmp)

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