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1. Trojans A computer trojan is an executable program that masquerades as performing a benign activity but also does some malicious. For example, a user might download what is advertised as a calendar program, yet when it is installed, in addition to installing the calendar it also install malware that scans the system for credit card numbers and passwords, connects through the network to a remote system and then transmit that information to the attackers

2. Ransomware It prevents a user’s device from properly and fully functioning until a fee is paid. The ransomware embeds itself onto the computer in such a way that it cannot be bypassed and even rebooting causes the ransomware to launch again. Ransomware displays a screen and prevent the user form accessing the computer’s resources (called blocker ransomware)