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ChaCha Ransomware (.<4~7-Digit Random Extension>)

  • Distribution Method : Unknown
 
  • MD5 : 248c960c1ae54103dea5bfae924f28e2
 
  • Major Detection Name : Trojan.Ransom.ChaCha (ALYac), Trojan-Ransom.Win32.Cryptor.cit (Kaspersky)
 
  • Encrypted File Pattern : .<4~7-Digit Random Extension>
 
  • Malicious File Creation Location :
     - C:\ProgramData\foo.db
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\DECRYPT-FILES.html
 
  • Payment Instruction File : DECRYPT-FILES.html
 
  • Major Characteristics :
     - Offline Encryption
     - Maze Ransomware series
     - Disable system restore ("C:\<Random>\<Random>\..\..\Windows\<Random>\<Random>\<Random>\..\..\..\system32\<Random>\..\wbem\<Random>\<Random>\..\..\wmic.exe" shadowcopy delete)
     - Encryption guide using Text-to-Speech (TTS) function
     - Changes desktop background (C:\Users\%UserName%\AppData\Local\Temp\123456789.bmp)

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