The systems administrator found guilty Wednesday of launching an attack on UBS PaineWebber four years ago now faces a maximum of 6-1/2 to eight years in federal prison. And federal prosecutors say they will be asking for the maximum sentence.

After about 20 hours of deliberation, the jury returned a guilty verdict on two out of four charges for Roger Duronio, 63, of Bogota, N.J. Duronio was found guilty of computer sabotage and securities fraud. He was acquitted on two counts of mail fraud. He will be sentenced at a later date.

Karina Byrne, a spokeswoman for UBS, said executives at the company appreciate the hard work the entire prosecution team put into the case and are just happy to get the incident behind them.

"UBS is committed to ensuring the safety and security of our computer system," she read from a prepared statement. "We're grateful for the hard work of the jury."

The six-week trial saw dueling forensics experts from the government and the defense take the stand. The government also put Duronio's former supervisor at UBS on the stand, along with UBS employees who worked on fixing the problem back in March of 2002, his two stock brokers, and the U.S. Secret Service agent who led the investigation. In sharp contrast, the defense only put on two witnesses--the forensics expert and a corporate lawyer from UBS who was questioned about documents the company was not able to supply and what happened to different computers after the attack.

UBS was hit on March 4, 2002, at 9:30 in the morning, just as the stock market opened for the day. Files were deleted from up to 2,000 servers in both the central data center in Weehawken, N.J., and in branch offices around the country. Company representatives never reported the cost of lost business but did say it cost the company more than $3.1 million to get the system back up and running.

Duronio worked at UBS as a systems administrator until he quit a few weeks before the attack. Witnesses testified that he quit because he was angry that he didn't receive as large an annual bonus as he expected. Investigators found copies of the malicious code on two of his home computers and on a printout sitting on his bedroom dresser.

The defense argued that the UBS network was riddled with security holes that would have allowed any number of people to masquerade as Duronio and move around the network unnoticed. They also argued that the evidence available--in the form of backup tapes for the damaged servers--was incomplete, leaving holes in the picture of what happened in the months before the security incident.