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Check out our video library AppCheck defending against newest ransomware, automatic recovery and real-time backup.

  • Distribution Method : Unknown
 
  • MD5 : c0202cf6aeab8437c638533d14563d35
 
  • Major Detection Name : Trojan.Ransom.Ryuk.A (BitDefender), Trojan-Ransom.Win32.Hermez.bn (Kaspersky)
 
  • Encrypted File Pattern : <Original Filename>.<Original Extension>
 
  • Malicious File Creation Location :
     - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp\RyukReadMe.txt
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RyukReadMe.txt
     - C:\Users\Public\PUBLIC
     - C:\Users\Public\sys
     - C:\Users\Public\UNIQUE_ID_DO_NOT_REMOVE
     - C:\Users\Public\window.bat
 
  • Payment Instruction File : RyukReadMe.txt
 
  • Major Characteristics :
     - Offline Encryption
     - Hermes Ransomware series
     - Encrypting files through code injection into various running processes
     - Block processes execution (agntsvc.exe, dbeng50.exe, excel.exe, msftesql.exe, mydesktopqos.exe, zoolz.exe etc.)
     - Stop multi services (Acronis VSS Provider, Enterprise Client Service, Sophos Agent, SQLsafe Backup Service, Symantec System Recovery, Veeam Backup Catalog Data Service etc.)
     - 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)
     - Delete backup files (<Drive Letter>:\*.bac, <Drive Letter>:\*.bak, <Drive Letter>:\*.bkf, <Drive Letter>:\*.dsk, <Drive Letter>:\*.set, <Drive Letter>:\*.VHD, <Drive Letter>:\*.wbcat, <Drive Letter>:\*.win, <Drive Letter>:\Backup*.*, <Drive Letter>:\backup*.*)

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