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In order to create a malware program that is undetected by present antivirus software, one would need to have a deep understanding of how these programs work. This is due to the fact that anti-viruses software application uses a variety of methods to spot and get rid of malware, kinds of malware (you could check here) and a programmer would require to know how to prevent these detection approaches.
One method that antivirus software application uses to spot malware is signature-based detection. In order to produce a piece of malware that is undetectable by signature-based detection, a developer would need to create a file that does not contain the signature of any recognized pieces of malware.
Another method that antivirus software utilizes to find malware is behavior-based detection. In order to develop a piece of malware that is undetected by behavior-based detection, a developer would need to create a file or program that does not exhibit any destructive habits.
A third approach that antivirus software application uses to spot malware is heuristic-based detection. In order to create a piece of malware that is undetectable by heuristic-based detection, a developer would require to create a file or program that does not exhibit any of the indications that are generally associated with malware.
Overall, it would be really hard to develop a malware program that is undetected by current antivirus software. This is since antivirus software application uses a range of 15 different types of malware (More Support) methods to detect and get rid of malware, and 5 types of malware (controlc.com) a programmer would require to be familiar with all of these approaches in order to prevent detection.