When the application of anti-virus software has not been applied to all servers and computers of the company, hackers have developed computer viruses in various ways. Traditional anti-virus software is no longer the only means of protecting employees' computers or servers. Computer viruses (Malware) can be subdivided into different types, such as worms, Trojans, backdoor viruses, ransomware, and so on. The design of traditional anti-virus software is mainly to split computer files into small parts and compare the data of each part with the anti-virus definition of the database. Therefore, it is easy to bypass the protection of the anti-virus software if hackers slightly change the code of the virus. 

Therefore, major anti-virus software manufacturers have begun to use advanced technology to analyze the behavior of computer viruses. For example, using EDR (Endpoint Detection and Response) for active real-time monitoring, machine learning and other technologies to deeply analyze the behavior of each program. Compared with traditional anti-virus software, EDR not only enhances the anti-virus capabilities, but also allows IT administrators to centrally manage digital assets within the company. You can even establish preset policies to isolate computers infected by computer viruses, block related threats from spreading in the company, and help security experts conduct computer authentication. However, EDR can only operate in computer and server in the company, but it does not cover other assets of the company. Therefore, XDR has become the newest technology in recent years. 

XDR (Extended Detection and Response) adds a lot of sensors on the basis of EDR for further centralized management and in-depth analysis. For example, collecting different data such as firewall, cloud server, data leakage prevention and email. IT administrators can use XDR to observe the monitoring data, security logs, and threat intelligence of the entire company environment to manage the IT security of the entire company. Moreover, after a security incident occurs, XDR products can directly analyze the root cause of the incident, the timeline of the intrusion, and the scope of impact, greatly reducing the manpower and material resources required by the company. 

On the other hand, the evolution of computer viruses is ever-changing, and hackers are always finding new ways to bypass security products. However, the next generation of security products will convert the data of security incidents around the world into malicious programs, Indicators of Compromise (IoC) or malware identification rules. As long as the IT administrator can ensure that all devices are equipped with next-generation products (e.g. EDR, XDR), and enable regular definition updates, the possibility and impact of the company's intrusion can be greatly reduced and the important information assets of company.

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