Common types of malware include:

• Virus - (e.g. Melissa):
• Malware that is parasitic in nature and replicates by copying itself to other programs
• Not able to self-replicate, requires a host file
• Worm - (e.g. ILOVEYOU, Code Red):
• Causes maximum damage to corporate information
• Self-replicates across networks, without a host file, through inbuilt email or scan engines
• Trojan - (e.g. Bowling for Elves):
• An "impostor," a program that appears legitimate, but contains malicious code, and does not self-replicate
• Can be a carrier for a virus

Note: Malware may impact performance of essential functions, including accessing records or systems.