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CrySis Ransomware (.id-<Random>.[backdata@qq.com].qwex)

  • Distribution Method : Unknown
 
  • MD5 : 7b604cea88d1a2f88963eb4bae82b206
 
  • Major Detection Name : MSIL/Crysis.EE29!tr.ransom (Fortinet), Trojan.Win32.S.Dharma.335872 (ViRobot)
 
  • Encrypted File Pattern : .id-<Random>.[backdata@qq.com].qwex
 
  • Malicious File Creation Location :
     - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
     - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\RegAsm.exe
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Info.hta
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RegAsm.exe
     - C:\Users\%UserName%\AppData\Roaming\Info.hta
     - C:\Users\%UserName%\AppData\Roaming\RegAsm.exe
     - C:\Windows\System32\Info.hta
     - C:\Windows\System32\RegAsm.exe
     - C:\Users\%UserName%\Desktop\FILES ENCRYPTED.txt
     - C:\Users\Public\Desktop\FILES ENCRYPTED.txt
     - <Drive Letter>:\FILES ENCRYPTED.txt
 
  • Payment Instruction File : FILES ENCRYPTED.txt / Info.hta
 
  • Major Characteristics :
     - Offline Encryption
     - Dharma / Phobos / Troldesh Ransomware series
     - File encryption using "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe"
     - Block processes execution (1cv77.exe, 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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