malware removal tools have virus like behavior…and are often detected… and it is called a False Positive http://antivirus.about.com/od/antivirusglossary/g/falsepositive.htm
these tools are used evry day here by the malware removal team …surf viruses and worms forum section and see

name of those in Malware removal team is listed here http://forum.avast.com/index.php?topic=53253.0