The much delayed sentencing of former LulzSec hacker-turned-FBI informant Hector "Sabu" Monsegur finally took place on Tuesday, when he received time served plus one year of supervised release with computer logging.

The penalty was handed down in federal court in New York, where recently filed court documents (PDF) show Monsegur has helped the feds disrupt more than 300 attacks against targets ranging from the US military to NASA, Congress to private companies. "The amount of loss prevented by Monsegur’s actions is difficult to fully quantify, but even a conservative estimate would yield a loss prevention figure in the millions of dollars," the document stated.

Monsegur assisted in high-profile hacks of security firm HBGary and others as a member of LulzSec, a sect of Anonymous. He began cooperating with the FBI in June 2011 after his arrest at the Jacob Riis public housing complex in New York City. His work for the feds began immediately. Eventually Monsegur helped the government build cases against numerous Anonymous hackers, including Stratfor hacker Jeremy Hammond. He apparently also assisted the government in its investigation of Wikileaks.

According to the New York Times, prosecutors filed the new documents because they are asking Judge Loretta A. Preska for leniency in light of Monsegur's "extraordinary cooperation." Sentencing in Monsegur's case is currently scheduled for Tuesday in a Federal District Court in Manhattan. But while some of the other hackers in the LulzSec saga have faced steep penalties (for example, Hammond is serving a 10-year sentence), the government has asked for Monsegur to only be sentenced to time served—just seven months.

The documents from this week also include the government's explanation of Monsegur's role in coordinated attacks on foreign websites in early 2012 (though many details remain vague). According to NYT, targets included Pakistan, Iran, Turkey, and Brazil, and "at law enforcement direction" Monsegur tried to find out about the software vulnerability these attacks were exploiting. But from additional new details unsealed from Hammond's case, Monsegur apparently instructed Hammond directly in hacks of some foreign websites with a target list of more than 2,000 domains in numerous countries.

Ars will have more details about Monday's sentence in a post to follow.

Post updated Monday to reflect sentence.