"[3] In 2008, at a US military base in the Middle East, a USB flash drive infected with Agent.BTZ was inserted into a laptop attached to United States Central Command.
"[8] An article in the Los Angeles Times reported that US defense officials described the malicious software as "apparently designed specifically to target military networks."
It's "thought to be from inside Russia", although it was not clear "whether the destructive program was created by an individual hacker or whether the Russian government may have had some involvement.
"[9] In 2010, American journalist Noah Shachtman wrote an article to investigate the theory that the worm was written by a single hacker.
[10] In December 2016, the United States FBI and DHS issued a Joint Analysis Report which included attribution of Agent.BTZ to one or more "Russian civilian and military intelligence Services (RIS).