Due to the enlargement of the use of Internet, computers are no longer separated systems. On the contrary, the frequency of sharing between computers¡¦ computing abilities, devices, and resources is surprisingly high in the last few decades. This situation makes people have a more convenient network situation. However, dangers also come along. Ever since the event occurred in 1988, the first computer worm (Morris Worm) makes people be aware of this issue. The computer network world has becoming an environment contains many potential dangers. Whereas the computer security incidents are increasing dramatically, many countries have established some specific organizations to solve these problems. TWCERT/CC (Taiwan Computer Emergency Response Team/ Coordination Center) is one of these organizations. The utilities of TWCERT/CC are to help people be aware of computer network dangers, to make responses and coordinate the security incidents inside and outside Taiwan, and to supervise the security circumstances in Taiwan and to announce alerts or take proper actions when the situation is serious. Responding and coordinating those incidents in TWCERT/CC is one crucial everyday job which requires a very complicated procedure. However, without a systematic method to handle the security incidents would be a heavy load for a computer security incident response team. This research is to develop a systematic method and procedure to handle incident and a system can implement this procedure. The goal is to shorten the processing time of incidents and enhance the accuracy of handling incidents, and to analyze the data collected from the system to get useful information.

This master's thesis describes methodologies used in malware forensic analysis including methods used in static and dynamic analysis. Based on those methods a tool intended to be used by Computer Security Incident Response Teams (CSIRT) is designed to allow fast analysis and decisions regarding malware samples in security incident investigations. The design of this tool is thorougly described in the work along with the tool's requirements on which the tool design is based on. Based on the design a ForensIRT tool is implemented and then used to analyze a malware sample Cridex to demonstrate its capabilities. Finally the analysis results are compared to those of other comparable available malware forensics tools.