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Computers in the United States launched the most cyberattacks in 2008, according to a security firm. The United States central command was hit by an attack and affected computers in combat zones in the Middle East. A worm, exploiting the emergency Microsoft patch, turns infected computers into bots that can launch DDoS attacks. The number of computers currently controlled by botnets has exploded in recent months, say researchers. Lawyers for Gary McKinnon, the hacker who broke into Nasa computers, have appealed to the Home Secretary in a bid to stop him being jailed in the US. Software that hijacks a computer's clipboard is being used to unkowningly direct users to scam web sites. Details are emerging of security leaks at the White House which have shut down an internet spying operation that had successfully cracked al-Qaeda's computers. In the latest response to the massive laptop data breach that placed the personal information of some 26.5 million veterans and active duty members at risk for identity theft, the Department of Veterans Affairs (VA) announced Monday that all its computers will be encrypted, effective immediately. Despite the old adage that Mac computers are impervious to security threats, a throng of recent attacks over the past couple of years have made it necessary for Mac users to protect themselves. A Los Angeles man pleaded guilty on Wednesday to charges he oversaw a collection of hundreds of thousands of zombie computers that he used to steal personal data and perpetrate identity theft. The total amount of malware removed from Australian PCs grew by over 55 percent in the first half of 2008, Microsoft has reported. A Brazilian man has been indicted for conspiring to broker the sale of a botnet which allegedly damaged 100,000 Pcs. A recent study by the Organisation for Economic Cooperation and Development (OECD) has found malware has become so prevalent that 25 percent of computers in the United States are now infected. Unitrends CEO Duncan McPherson looks at how encryption has become an increasingly important technology for businesses. Unitrends CEO Duncan McPherson looks at how encryption has become an increasingly important technology for businesses. Trend Micro has detected a new DNS changing form of malware, which poisons other hosts on the local subnet installing a rogue Dynamic Host Configuration Protocol (DHCP) server on the network. New data indicates that 98 out of 100 computer users are running at least one unpatched program. For possibly the first time ever, Apple is recommending Mac OS X users deploy anti-virus solutions -- but it remains unclear exactly why. Since Microsoft's Windows Server Service vulnerability was patched in late October, exploits have continually surfaced. The fall in global spam levels after the shutting of web hosting company McColo looks to be short-lived after researchers reported that the Srizbi botnet has been reactivated.