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  • Distribution Method : Unknown
 
  • MD5 : 718027b3ae3247ab0991167f94ec0280
 
  • 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
     - Results system booting failure by encrypting "C:\bootmgr"
     - Stop multi services (audioendpointbuilder, samss)
     - Delete backup files (*.bac, *.bak, *.bkf, *.dsk, *.set, *.wbcat, *.win, Backup*.*, backup*.*)
     - Disable system restore (vssadmin Delete Shadows /all /quiet, vssadmin resize shadowstorage /for=<Drive Letter>: /on=<Drive Letter>: /maxsize=401MB, vssadmin resize shadowstorage /for=<Drive Letter>: /on=<Drive Letter>: /maxsize=unbounded)
     - Encrypt network drives using WOL (Wake-on-LAN) to turn on remote PC. (<Ransomware>.exe 8 LAN, \\<Host IP>\<Drive Letter>$\\<File Path>)

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