Adware:. The least dangerous and most lucrative Malware. Adware displays ads on your computer.
Spyware:tracking your internet activities in order to send advertising (Adware) back to your system.
Virus: code that attaches itself to another piece of software, and then reproduces itself when that software is run and often this is spread by sharing software or files between computers.
Worm: A program that replicates itself and destroys data and files on the computer. Worms work to “eat” the system operating files and data files until the drive is empty.
Backdoors: they open a “backdoor” onto a computer, providing a network connection for hackers or other Malware to enter or for viruses or SPAM to be sent.
Key loggers: Records everything you type on your PC in order to glean your log-in names, passwords, and other sensitive information, and send it on to the source of the keylogging program.
Rogue security software: This one misleads users. It pretends to be a good program to remove Malware infections, but all the while it is the Malware.
Ransom ware: If you see this screen that warns you that you have been locked out of your computer until you pay for your cybercrimes. Your system is severely infected with a form of Malware called Ransomware. It is not a real notification from the FBI, but, rather an infection of the system itself.
Symptoms to look out for
3.Suspicious hard drive activity