The threat of malicious software can easily be considered as the greatest threat to Internet security. Earlier, viruses were, more or less, the only form of malware. Nowadays, the threat has grown to include network-aware worms, trojans, DDoS agents, IRC Controlled bots, spyware, and so on. The infection vectors have also changed and grown and malicious agents now use techniques like email harvesting, browser exploits, operating system vulnerabilities, and P2P networks to spread. A relatively large percentage of the software that a normal internet user encounters in his online journeys is or can be malicious in some kind of way. Most of this malware is stopped by antivirus software, spyware removal tools and other similar tools. However, this protection is not always enough and there are times when a small, benign looking binary sneaks through all levels of protection and compromises user data.

By S. G. Masood at SecurityFocus.

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