Kaspersky Lab officially downplayed the risk to its users at the time of the public leak in 2011: Outdated Technology:

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The file behind this search string originated in . A former developer working at Kaspersky Lab used their legitimate internal access credentials to systematically download fragments of the company's core software products. Key aspects of the theft included:

[2008] Stolen by employee -> [2009-2010] Traded secretly on private hacking forums -> [Jan 2011] Leaked widely via public file shares & Torrents