Microsoft takes down major fake drug spam network
Saturday 19 March 2011
Microsoft on Thursday announced the dismantling of a "notorious and complex" network of virus-infected computers used to send billions of email messages daily hawking fake drugs.
The Rustock "botnet" consisted of about a million computers that were infected with malicious code to let hackers covertly control the machines from afar using "command and control" servers.
Owners of infected computers are typically not aware that hackers are using their machines.
"Bot-herders infect computers with malware in a number of ways, such as when a computer owner visits a website booby-trapped with malware and clicks on a malicious advertisement or opens an infected email attachment," said Microsoft Digital Crimes Unit senior attorney Richard Boscovich.
"Bot-herders do this so discretely that owners often never suspect their PC (personal computer) is living a double life."
Rustock was reported to be among the world's largest spam botnets and was capable of sending as many as 30 billion emails per day.
Much of the email sent by Rustock advertised counterfeit or unapproved knock-off versions of drugs like Viagra, while other spam tried to dupe people with bogus Microsoft lottery notices, according to Boscovich.
Microsoft worked with Viagra-maker Pfizer and network security firm FireEye during a months-long investigation that culminated with using US warrants to seize "command and control" servers in the western state of Washington.
Rustock was knocked offline on Wednesday when the connection was severed between infected computers and the machines used to give them orders, according to Boscovich.
Evidence seized was being analyzed for clues about the hackers and their operations. Microsoft was offering tools at support.microsoft.com/botnets to purge the malware from infected computers.
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