bt.exe is a Backdoor W32.Alcra.A. bt.exe spreads via open network shares. bt.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\regedit.com %System%\taskmgr.exe %System%\tasklist.com %System%\taskkill.com %System%\netstat.com %System%\tracert.com %System%\ping.com %System%\cmd.com %ProgramFiles%\MSConfigs\MSConfigs.exe %System%\bt.exe %System%\z.tmp %System%\temp.zip %System%\bszip.dll %System%\p2pnetwork.exe winis.exe win32exe.exe wini.exe winlogins.exe muamgr.exe Adds the value: "MsConfigs" = "MsConfigs.exe" "p2pnetwork" = "p2pnetwork.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill bt.exe process and remove bt.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.