In order to produce a malware program that is undetected by present anti-viruses software application, one would require to have a deep understanding of how these programs work. This is because antivirus software uses a range of methods to detect and eliminate malware, and a developer would require to know how to avoid these detection approaches.

One technique that antivirus software utilizes to find malware is signature-based detection. This involves the antivirus software trying to find a specific signature or "fingerprint" that is special to a specific piece of malware. The anti-virus software will flag the file as being harmful and take action to remove it if the signature is discovered. In order to create a piece of malware that is undetected by signature-based detection, a developer would need to create a file that does not contain the signature of any known pieces of malware.

Another method that antivirus software utilizes to spot malware is behavior-based detection. This involves the software application observing the behavior of a file or program and identifying whether it is destructive based upon its actions. For instance, a malware program might be detected if it attempts to delete critical system files or encrypt personal data. In order to produce a piece of malware that is undetectable by behavior-based detection, a programmer would require to create a file or program that does not show any harmful behavior.

A 3rd technique that antivirus software application uses to discover malware is heuristic-based detection. This includes the software application trying to find indications that a file or program might be destructive, even if it does not match the signature of any recognized piece of malware. A file may be flagged as being suspicious if it is really large or if it includes code that is typically utilized by malware programs. In order to create a piece of malware that is undetectable by heuristic-based detection, a programmer would require to create a file or program that does not display any of the indications that are generally connected with malware.

In general, it would be really hard to produce a malware program that is undetectable by existing antivirus software application. This is because antivirus software application utilizes a range types of computer malware various techniques to remove and find malware, and a developer would need to be acquainted with all of these methods in order to prevent detection.