MrNo4236.exe is a Trojan W32.Rbot-AQY. MrNo4236.exe opens a back door on IRC channels. MrNo4236.exe spreads via open network shares. Related files: %System%\MrNo4236.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill MrNo4236.exe process and remove MrNo4236.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.