I somehow missed to see that anybody but you claims that, so please give some link. I also, like the parent poster, only read that the antvirus program, as it should, collected the virus to the company servers.
https://www.wsj.com/articles/russian-hackers-stole-nsa-data-...
>The hackers appear to have targeted the contractor after identifying the files through the contractor’s use of a popular antivirus software made by Russia-based Kaspersky Lab, these people said.
No mention of FSB in that article.
"Investigators did determine that, armed with the knowledge that Kaspersky’s software provided of what files were suspected on the contractor’s PC, hackers working for Russia homed in on the machine and obtained a large amount of information, said the people familiar with the matter."
But that sounds very implausible, which entry would "the hackers" use? Note that nobody claims that Kaspersky did that "obtaining" that way (by hacking). But it appears to me that Kaspersky software simply first detected suspicious files and then also send them to the servers, which is what the software of most antivirus vendors does. And then the "hackers" story was invented to make it more dramatic. That better fits with the story of the NSA trojan files found on Kaspersky servers by the Israeli, as they hacked Kaspersky.