Here’s a combined hoax and malware. Let’s start from the beginning.
People have been posting notes on Facebook about something called “un named app”. It tells you to remove something from Facebook. It’s a hoax. Don’t believe what it says, don’t follow the instructions, and don’t pass it on.
Below are some quotes of the hoax:
ALERT >>>>> Has your facebook been running slow lately? Go to “Settings” and select “application settings”, change the dropdown box to “added to profile”. If you see one in there called “un named app” delete it… It’s an internal spybot. Pass it on
this is real.. i checked and found this app and deleted it… hopefully, my facebook will run better now.
Cannot believe how much quicker mine is running after doing this….
I don’t have this app on my Facebook account but if you do, don’t worry. It’s a normal part of Facebook and you shouldn’t delete it.
Now the second part of this hoax is a real trojan. If you go to Google and search for “facebook unnamed app” you’ll see quite a few results. Some of these results are fake antivirus programs.
A fake antivirus program is actually a trojan. It pretends to scan your PC and quietly installs malware in the background. It goes under the name of Security Tool, it has a fancy detection screen and everything. But it’s definitely bad.
The rule of thumb is that if a web page tells you that your PC might be infected, don’t trust it. Go and get your own antivirus program, not something that pops up on your screen (see here for a good free antivirus program).
There’s a lot to learn here. Basically, be careful who you trust. These days scammers have to trick you into installing malware and they’re good at it (it’s called social engineering).