Christopher Maxwell, 20, of Vacaville, Calif., was charged by a federal grand jury in Seattle with one count each of conspiracy to commit computer fraud and conspiracy to damage a protected computer.
The botnet allegedly overwhelmed and disrupted computer service at Seattle's Northwest Hospital, the U.S. Attorney's office said at a news conference.
The charges stem from a January 2005 computer infection that allegedly netted Maxwell and his co-conspirators $100,000 paid by companies that had their adware secretly installed on personal computers.
The alleged conspiracy involved compromising the security of high-powered computers at the University of Michigan, Cal State Northridge and UCLA.
Swim Week Miami Beach 2014 [PHOTOS]