A former leader of hacking group LulzSec has helped the FBI thwart an estimated 300 cyber attacks since his arrest on hacking charges in 2011, court documents reveal. Hector Xavier Monsegur has helped to prevent losses of millions of dollars, according to court documents filed by prosecutors. Monsegur will be sentenced on Tuesday for his role in major online hacking attacks, but his aid will likely go a long way in getting him a reduced sentence.
LulzSec was formed in May 2011 when Monsegur (AKA Sabu) and five other members of the Anonymous hacking movement joined forces. According to the documents filed with the court, the group was responsible for major hacks into and thefts from servers belonging to companies including Fox Television, Nintendo and Sony.
Monsegur was arrested in June 2011 and pled guilty, as part of a cooperation agreement with the US government, to nine counts related to computer hacking, amongst others.
The documents filed in a New York court last week reveal that Monsegur's most substantial assistance came from his "cooperation against significant cybercriminals" affiliated with Anonymous, LulzSec and Internet Feds. Prosecutors say his help allowed the FBI to identify, prosecute and convict the "number one cybercriminal target in the world" at the time – Jeremy Hammond. He also helped prevent major hacking attacks that were being planned by active cybercriminals, according to the court documents.
Prosecutors called Monsegur's help "extraordinarily valuable and productive" and have recommended that his sentence is limited to "time served". He has already spent seven months in jail after breaking conditions of his bail in 2012.