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When Sony declared a war on software and music piracy in 2005, little did the world consider that the company could be putting malware on the discs it sold.
When the CD was inserted into a computer, it would install a rootkit invisible even to the most advanced anti-spyware or anti-virus software of the time. But Sony was found up the creek when hackers and cyber-attackers would use the same rootkit to hide malware of their own to capture keystrokes or steal data.
Over half a million machines were infected, which was only made worse by a "fix" that Sony brought out to try and solve the problem. Lawsuits flew everywhere as a result, and Sony was left very red-faced after the whole incident.