According to 1UP: "Today Symantec Security
Response experts identified the first Trojan that targets Sony Playstation Portable systems, Trojan.PSPBrick, as a
Category 1 threat (Category 5 being the worst). As of today, there are no confirmed infections."
Thankfully, this type of virus (or, more specifically, a Trojan) can only infect your PSP if you go out and download
it, as it masquerades as hack for homebrew games, so the danger is minimal (Category 1), at least for now.
But how we avoid these malicious attempts by hackers to delete system files and effectively brick our Sony
portables (without even downgrading firmware!)? As
Symantec "is working on analyzing the threat now," one can only hope they release (or don't release) Norton Antivirus:
The PSP Edition.
[Thanks, bandersnatch]
Engadget
TUAW