A few of the sites were able to solve the problems directly through Google's webmaster tools but some like Torrentz are still blocked.
"The site ahead contains harmful programs," reads the page. "Attackers on torrentz.eu might attempt to trick you into installing programs that harm your browsing experience (for example, by changing your homepage or showing extra ads on sites you visit)."
All the sites have denied hosting malicious software and are expected to be back and available by the end of the weekend.
Source:
Ernesto