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Xorist Ransomware (.vaca)

  • Distribution Method : Unknown
 
  • MD5 : 589b9c5de06a525f321ddea75ce182f5
 
  • Major Detection Name : Trojan/Win32.Xorist.R25524 (AhnLab V3), TR/Ransom.Xorist.EJ (Avira)
 
  • Encrypted File Pattern : .vaca
 
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AppData\Local\Temp\1f73RBh2WRt5t6p.exe
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\HOW TO DECRYPT FILES.txt
 
  • Payment Instruction File : HOW TO DECRYPT FILES.txt
 
  • Major Characteristics :
     - Offline Encryption
     - Boom / Xorist-Frozen Ransomware series
     - When the encrypted file (.vaca) icon is changed (HKEY_CLASSES_ROOT\BMNLHQSXRFYHECK) and the ransomware file (%Temp%\1f73RBh2WRt5t6p.exe) is executed.

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