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In order to produce a malware program that is undetected by existing anti-viruses software application, one would need to have a deep understanding of how these programs work. This is due to the fact that antivirus software utilizes a variety types of malware in computer (Learn Alot more) strategies to spot and remove malware, and a programmer would require to know how to prevent these detection approaches.
One approach that antivirus software application uses to spot malware is signature-based detection. This involves the antivirus software looking for a specific signature or «finger print» that is unique to a specific piece of malware. The antivirus software application will flag the file as being destructive and take action to remove it if the signature is found. In order to produce a piece of malware that is undetectable by signature-based detection, a developer would need to produce a file that does not consist of the signature of any known pieces of malware.
Another technique that antivirus software uses to discover malware is behavior-based detection. In order to create a piece of malware that is undetectable by behavior-based detection, a developer would require to develop a file or program that does not show any harmful behavior.
A 3rd method that antivirus software application uses to spot malware is heuristic-based detection. In order to produce a piece of malware that is undetectable by heuristic-based detection, a developer would require to produce a file or program that does not exhibit any of the signs that are generally associated with malware.
Overall, it would be extremely hard to produce a malware program that is undetected by current antivirus software application. This is because anti-viruses software application uses a range of different methods to remove and detect malware, and a programmer would require to be knowledgeable about all of these approaches in order to prevent detection.