Breatle.exe is a worm W32.Bratle.A. Breatle.exe spreads by exploiting the Microsoft Windows LSASS Buffer Overrun Vulnerability (Microsoft Security Bulletin MS04-011). Related files: %System%\breatle.exe %System%\Warning.txt Adds the value: %System%\breatle.exe to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill breatle.exe process and remove breatle.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.