Moscow-based anti-virus software maker Kaspersky Lab said on Wednesday that its security software had taken source code for a secret American hacking tool from a personal computer in the United States.

In September, U.S. officials ordered Kaspersky's products removed from government computers, saying the firm was vulnerable to Kremlin influence and that using the software could jeopardize national security.

After that announcement, the Wall Street Journal reported on Oct. 5 that hackers working for the Russian government appeared to have targeted a National Security Agency (NSA) worker by using Kaspersky software to identify classified files in 2015. The New York Times reported on Oct. 10 that Israeli officials reported the operation to the United States after they hacked into Kaspersky's network.