Seann Pietila, 19, discussed his plans to stage a mass shooting in private messages on Instagram, according to documents filed last week.
Seann Pielia, 19, now faces charges of transmitting a communication containing a threat to injure another individual.
Neither the name of the affected software nor the details of the alleged vulnerability were identified.
Ted Kaczynski, who was convicted of killing three people and wounding more than 20 others as the "Unabomber," died in a North Carolina federal prison on Saturday.
The 71-year-old man had rigged a rat trap with a shotgun.
The bureau said it had recently observed an uptick in extortion victims saying they had been targeted using doctored versions of innocent images taken from online posts, private messages, video chats
Hanssen, 79, was sentenced in 2002 to life in prison after pleading guilty to spying for the Soviet Union and later Russia for over 20 years.
An IRA member said he wanted to assassinate Queen Elizabeth II while her yacht was sailing under the Golden Gate Bridge or at Yosemite.
The official identified the FSB hackers behind the malware with a notorious hacking group known as "Turla."
Ukrainian authorities are collecting digital information from battlefields and Ukrainian towns ravaged by the war since Russia invaded the country last February.
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