Not a virus
This functionality has been built into monster, and many other jobsites. Basically recruiters / employers can query the backend of the database directly.
There's no need to write a virus to do this, just pose as a recruiter and monster will allow you to connect directly to the backend database.
Office Angels have had a tool that does just this and they are happy to rent the tool out to anyone who can afford it....
Jobseekers need to be more careful with their data.