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Maze v1.2 Ransomware (.<4~7-Digit Random Extension>)

  • Distribution Method : Automatic infection using exploit by visiting website
 
  • MD5 : 8e8eaa9b81f664c796225ac49e9ecb71
 
  • Major Detection Name : Trojan/Win32.Ransom.R284855 (AhnLab V3), Trojan-Ransom.Win32.GenericCryptor.lgj (Kaspersky)
 
  • Encrypted File Pattern : .<4~7-Digit Random Extension>
 
  • Malicious File Creation Location :
     - C:\ProgramData\0x29A.db
     - C:\Users\%UserName%\AppData\LocalLow\<Random>.tmp
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\DECRYPT-FILES.html
 
  • Payment Instruction File : DECRYPT-FILES.html
 
  • Major Characteristics :
     - Offline Encryption
     - ChaCha Ransomware series
     - The English and Korean users targeted
     - Disable system restore ("C:\rj\uiqnx\..\..\Windows\pqr\sgf\..\..\system32\opdwl\mcpnd\j\..\..\..\wbem\hscj\xqvf\y\..\..\..\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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