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My Profile Top News Reuters top ten news stories delivered to your inbox each day. Subscribe You are here: Home > News > Technology > Article Home Business & Finance News U.S. Politics International Technology Internet Entertainment Sports Lifestyle Oddly Enough Environment Health Science Special Coverage Video Pictures Your View The Great Debate Blogs Weather Reader Feedback Do More With Reuters RSS Widgets Mobile Podcasts Newsletters Your View Make Reuters My Homepage Partner Services CareerBuilder Affiliate Network Professional Products Support (Customer Zone) Reuters Media Financial Products About Thomson Reuters Conficker virus begins to attack PCs: experts Fri Apr 24, 2009 3:04pm EDT Email | Print | Share | Reprints | Single Page [-] Text [+] By Jim Finkle BOSTON (Reuters) - A malicious software program known as Conficker that many feared would wreak havoc on April 1 is slowly being activated, weeks after being dismissed as a false alarm, security experts said. Conficker, also known as Downadup or Kido, is quietly turning an unknown number of personal computers into servers of e-mail spam, they added. The worm started spreading late last year, infecting millions of computers and turning them into "slaves" that respond to commands sent from a remote server that effectively controls an army of computers known as a botnet. Its unidentified creators started using those machines for criminal purposes in recent weeks by loading more malicious software onto a small percentage of computers under their control, said Vincent Weafer, a vice president with Symantec Security Response, the research arm of the world's largest security software maker, Symantec Corp. Conficker installs a second virus, known as Waledac, that sends out e-mail spam without knowledge of the PC's owner, along with a fake anti-spyware program, Weafer said. The Waledac virus recruits the PCs into a second botnet that has existed for several years and specializes in distributing e-mail spam. Conficker also carries a third virus that warns users their PCs are infected and offers them a fake anti-virus program, Spyware Protect 2009 for $49.95, according to Russian-based security researcher Kaspersky Lab. If they buy it, their credit card information is stolen and the virus downloads even more malicious software. Weafer said that while he believes the number of infected machines that have become active is relatively small, he expects a consistent stream of attacks to follow, with other types of malware distributed by Conficker's authors. "Expect this to be long-term, slowly changing," he said of the worm. "It's not going to be fast, aggressive." Researchers feared the network controlled by the Conficker worm might be deployed on April 1 for the first time since the worm surfaced last year because it was programed to increase communication attempts from that date. The security industry formed a task force to fight the worm, bringing widespread attention that experts said probably scared off the criminals who command the slave computers. That task force thwarted the worm partially by using the Internet's traffic control system to block access to servers that control the slave computers. Viruses that turn PCs into slaves exploit weaknesses in Microsoft's Windows operating system. The Conficker worm is especially tricky because it can evade corporate firewalls by passing from an infected machine onto a USB memory stick, then onto another PC. The Conficker botnet is one of many such networks controlled by syndicates that authorities believe are based in eastern Europe, southeast Asia, China and Latin America. 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