SpywareSheriff (not to be confused with SpySheriff) is a new rogue antispyware app on the loose.
According to Bleeping Computer:
SpywareSheriff, a new rogue antispyware application that is starting to infect a lot of users. This particular infection is harder to remove than other variants such as SpywareQuake and SpyFalcon. This is because it uses a lot of random names for the files. It is, though, easy to tell when you are infected with this malware.
The application is distributed at antispylab(dot)com or spywaresheriff(dot)com.
(Thanks Suzi, Adam)