According to documents filed by federal prosecutors ahead of the hearing, the three men have already been assisting the FBI, helping law enforcement officials thwart cyberattacks and develop better strategies for mitigating new methods of attack. They estimated that the men had put in over 1,000 hours of work so far and began doing so even before they were charged. "The defendants have each exhibited tremendous dedication to their cooperation efforts," the prosecutors wrote.

The Mirai botnet caused a nationwide internet outage in the US in 2016 and the defendants admitted to creating it in order to initiate DDoS attacks against those they held grudges against and to generate revenue by renting the botnet out to others. The trio's work with the FBI has included helping prevent DDoS attacks during Christmas -- a popular time of year for them -- and mitigating effects of a new DDoS attack method known as Memcache to the point where attacks utilizing the protocol were rendered "functionally useless." They've also helped the FBI develop a program that allows law enforcement to examine cryptocurrency private keys in different formats.

"Cybercrime is a worldwide epidemic that reaches many Alaskans," US Attorney Bryan Schroder said in a statement. "The perpetrators count on being technologically one step ahead of law enforcement officials. The plea agreement with the young offenders in this case was a unique opportunity for law enforcement officers, and will give FBI investigators the knowledge and tools they need to stay ahead of cyber criminals around the world."