No rly. NONE are virus. Their trojans. Different things.
-First two, basically, won't do harm if you don't download hacked apps.
-The third is a 2 years old trojan that never really caught which was using spam (porn ads!). It then ASK your admin information.
-The forth is "trojan" prank, and you need physical access to the Mac to do anything.
Just TRY to find a working VIRUS (self replicating, that does DAMAGE), and not a trojan, that is still in circulation. Just try.