Kaspersky Lab said an individual, believed to be one identified as a National Security Agency worker in news accounts, triggered the company's antivirus software and paved the way for it to upload classified NSA files from his computer when he tried to pirate Microsoft Office and ended up infecting himself with malicious software.

The piracy claim is included in a set of preliminary findings released by the Moscow-based company from an internal investigation into a byzantine spying scandal that didn't seem like it could get any more bizarre. A series of news reports this month, citing U.S. intelligence sources, asserted that the files on the worker's computer, which included source code for sensitive hacking tools he was developing for the spy agency, were uploaded by Kaspersky security software and then collected by Russian government hackers, possibly with the company's knowledge or help. Kaspersky has denied that it colluded with Russian authorities or knew about the worker incident as it was described in the press.