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Ryuk Ransomware (.RYK / RyukReadMe.html / Version Contact)

  • Distribution Method : Unknown
  • MD5 : 45e3bef94fdefd78f8e6bcedd5f43715
  • Major Detection Name : Ransom.Ryuk (Malwarebytes), Ransom:Win32/Ryuk!MTB (Microsoft)
  • Encrypted File Pattern : .RYK
  • Malicious File Creation Location :
     - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp\RyukReadMe.html
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RyukReadMe.html
  • Payment Instruction File : RyukReadMe.html
  • Major Characteristics :
     - Offline Encryption
     - Hermes Ransomware series
     - Stop multi services (audioendpointbuilder, samss)
     - Block processes execution (backup, excel, firefoxconfig, msaccess, outlook, steam etc.)
     - Disable system restore (WMIC.exe shadowcopy delete, bcdedit /set {default} recoveryenabled No, bcdedit /set {default}, vssadmin.exe Delete Shadows /all /quiet)
     - Encrypt network drives using WOL (Wake-on-LAN) to turn on remote PC. (<Random>lan.exe 8 LAN, \\<Host IP>\<Drive Letter>$\\<File Path>)