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In order to create a malware program that is undetectable by existing 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 utilizes a variety of techniques to discover and eliminate malware, and a programmer would need to know how to avoid these detection techniques.
One method that antivirus software utilizes to discover malware is signature-based detection. This includes the anti-virus software application trying to find a particular signature or «fingerprint» that is distinct to a particular piece of malware. The anti-virus software application will flag the file as being harmful and take action to eliminate it if the signature is discovered. In order to produce a piece of malware that is undetected by signature-based detection, a programmer would require to produce a file that does not include the signature types of malicious software — go!!, any known pieces of malware.
Another method that antivirus software application utilizes to detect malware is behavior-based detection. This includes the software application observing the habits of a file or program and determining whether it is harmful based on its actions. A malware program might be discovered if it tries to erase important system files or encrypt individual information. In order to create a piece of malware that is undetected by behavior-based detection, a programmer would need to create a file or program that does not exhibit any harmful habits.
A 3rd approach that antivirus software application uses to spot malware is heuristic-based detection. In order to develop a piece of malware that is undetected by heuristic-based detection, a developer would need to produce a file or program that does not display any of the signs that are normally associated with malware.
In general, it would be extremely challenging to produce a malware program that is undetectable by existing antivirus software application. This is due to the fact that antivirus software uses a range of different approaches to remove and all types of malware identify malware, and a developer would need to be acquainted with all of these approaches in order to prevent detection.