Kaspersky denied the allegations, stating that the software had detected Equation Group malware samples which it uploaded to its servers for analysis in its normal course of operation. In October 2017, subsequent reports alleged that hackers working for the Russian government stole confidential data from the home computer of a National Security Agency (NSA) contractor in 2015 via Kaspersky antivirus software. Department of Homeland Security banned Kaspersky products from all government departments on 13 September 2017, alleging that Kaspersky Lab had worked on secret projects with Russia's Federal Security Service (FSB).

Kaspersky Lab has faced controversy over allegations that it has engaged with the Russian Federal Security Service (FSB) to use its software to scan computers worldwide for material of interest-ties which the company has actively denied. ( March 2022) ( Learn how and when to remove this template message)

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