Abcedg21.dll is a Trojan Backdoor.Homutex. Abcedg21.dll spreads via open network shares. Abcedg21.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\abcedg21.dll %System%\drivers\usbcamd0.sys Adds the value: "PackedCatalogItem" = "%System%\abcedg21.dll" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove abcedg21.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.