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black patent leather prada sneakers advertising fraud and bringing down websites, an action known as a denial of service attack. Most users do not know if their computers are infected.Rustock had hidden 96 command and control centres in the servers housed in those eight locations.At its peak the five year old botnet was believed responsible for 30 billion spam messages daily, mostly peddling fake Viagra, Microsoft branded lottery scams and bogus news items leading to malicious websites that installed malware on victims' machines. One Rustock infected PC was sending 10,000 emails hourly.Viagra's manufacturer, Pfizer, provided evidence and a private cyber security firm, FireEye, intelligence for the civil action.Patrick Ford, Pfizer's global security chief and a former FBI agent, told Fairfax Media the company bought advertised drugs to test.Products pretending to be Viagra, the anti inflammatory Celebrex and the hypertension medicine Norvasc, among 50 others, turned out to be generic drugs, placebos or a cocktail of wrong doses and chemicals including rat poison.''We gave the courts something they could have a good understanding of. Not only people's computers get a virus and machines are compromised but it is bad in a health safety sense,'' Ford said.He said innocent people were unsuspectingly drafted into botnets. ''You become an unwitting partner in the criminal organisation by clicking on those things.''According to the security company, Symantec, Rustock's downfall caused global spam volume to drop from 121.5 billion emails a day last year to 36.9 billion. Last month it was still below 40 billion, or 72.6 per cent of all global email traffic.Adrian Covich, a security expert at Symantec, says spam won't go away. There are at least two other botnets ready to take over Rustock's reins.New Microsoft intelligence recently showed 702,860 infected computers, identified by their IP addresses, were still reporting for Rustock work in June.It is a 56.12 per cent reduction on the 1.6 million IP addresses commanded before the takedown but those computers are not clean yet and infected computers are more likely to be redeployed.Symantec estimates there are up to 5.4 million personal computers operating under