Google's VirusTotal site can be very handy if you're worried about malware; upload a file and dozens of antivirus tools will check to see if it's malicious. However, it's now clear that this site can hinder as much as it helps. Security research Brandon Dixon has spotted several big hacking teams using VirusTotal to test attacks before launch, including two linked to state-sponsored operations. They effectively treat it like a debugging tool -- if one or more scanners detect a pre-release virus, the developers tweak their code until it slips under the radar. In some cases, they've even put old malware through the site to make it dangerous again.