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CrySis Ransomware (.id-<Random>.[cyb3rcrypt@protonmail.com].html)

  • Distribution Method : Remote access through Remote Desktop Protocol(RDP) or Terminal Services
 
  • MD5 : 96476fcf9ccbc4287663b3bf6b584e74
 
  • Major Detection Name : Ransom.Crysis (Norton), Ransom.Win32.CRYSIS.SM (Trend Micro)
 
  • Encrypted File Pattern : .id-<Random>.[cyb3rcrypt@protonmail.com].html
 
  • Malicious File Creation Location :
     - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\<Random>.exe
     - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\<Random>.exe
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
     - C:\Users\%UserName%\AppData\Roaming\<Random>.exe
     - C:\Users\%UserName%\AppData\Roaming\Info.hta
     - C:\Users\%UserName%\Desktop\RETURN FILES.txt
     - C:\Users\Public\Desktop\RETURN FILES.txt
     - C:\Windows\System32\<Random>.exe
     - C:\Windows\System32\Info.hta
     - <Drive Letter>:\RETURN FILES.txt
 
  • Payment Instruction File : Info.hta / RETURN FILES.txt
 
  • Major Characteristics :
     - Offline Encryption
     - Dharma / Phobos Ransomware series
     - Block processes execution (mysqld.exe, mysqld-nt.exe, outlook.exe, postgres.exe, sqlservr.exe etc.)
     - Stop multi services (mssqlserver, sqlserveradhelper, sqlwriter etc.)
     - Disable system restore (vssadmin delete shadows /all /quiet)

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