School ICT

Types of malicious code

• Viruses: pieces of code that attach to host programs and propagate when an infected program executes

• Worms: particular to networked computers, carry out pre-programmed attacks to jump across the network

• Trojan Horses: hide malicious intent inside a host program that appears to do something useful

• Attack scripts: programs written by experts to exploit security weaknesses, usually across the network

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• Java attack applets: programs embedded in Web pages that gain foothold through a browser

• ActiveX controls: program components that allow malicious code fragment to control applications or the OS