ABSTRACT
Malicious code is a great threat to computers and computer society. Numerous kinds of malicious codes wander in the wild. Some of them are mobile, such as worms, and spread through the Internet, causing damage to millions of computers worldwide. Other kinds of malicious codes are static, such as viruses, but sometimes deadlier than their mobile counterpart. Malicious code writers usually exploit software vulnerabilities to attack host machines. A number of techniques have been devised by researchers to counter these attacks. Unfortunately, the more successful the researchers become in detecting and preventing the attacks, the more sophisticated the malicious code in the wild appears. us, the battle between malicious code writers and researchers is virtually never ending.
