In 2017, the Australian Cyber Security Centre (ACSC) critically examined the different levels of sophistication employed by the attackers (Australian, 2017). Malware is intentionally created to compromise computer systems and take advantage of any weakness in intrusion detection systems. There are a large number of cybercriminals around the world motivated to steal information, illegitimately receive revenues, and find new targets. High profile incidents of cybercrime have demonstrated the ease with which cyber threats can spread internationally, as a simple compromise can disrupt a business’ essential services or facilities. For that reason, the detection of zero-day attacks has become the highest priority.
However, the new generation of malware has become more ambitious and is targeting the banks themselves, sometimes trying to take millions of dollars in one attack (Symantec, 2017). In the past, cybercriminals primarily focused on bank customers, robbing bank accounts or stealing credit cards (Symantec, 2017). A Symantec report found that the number of security breach incidents is on the rise. As highlighted in the Data Breach Statistics in 2017, approximately nine billion data records were lost or stolen by hackers since 2013 (Breach_LeveL_Index, 2017). According to the 2017 Symantec Internet Security Threat Report, more than three billion zero-day attacks were reported in 2016, and the volume and intensity of the zero-day attacks were substantially greater than previously (Symantec, 2017). As a result, various countries such as Australia and the US have been significantly impacted by the zero-day attacks. Therefore, computer security has become essential as the use of information technology has become part of our daily lives. In addition, there has been an increase in security threats such as zero-day attacks designed to target internet users. Malicious attacks have become more sophisticated and the foremost challenge is to identify unknown and obfuscated malware, as the malware authors use different evasion techniques for information concealing to prevent detection by an IDS.
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The evolution of malicious software (malware) poses a critical challenge to the design of intrusion detection systems (IDS).
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