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In order to develop a malware program that is undetected by existing anti-viruses software, one would need to have a deep understanding of how these programs work. This is since antivirus software application uses a variety of strategies to detect and remove malware, and a programmer would require to understand how to avoid these detection techniques.
One approach that antivirus software application utilizes to spot malware is signature-based detection. This involves the antivirus software trying to find a specific signature or «fingerprint» that is distinct to a specific piece of malware. The anti-virus software will flag the file as being destructive and take action to remove it if the signature is discovered. In order to develop a piece of malware that is undetectable by signature-based detection, a developer would require to develop a file that does not include the signature of any known pieces of malware.
Another approach that antivirus software application uses to find malware is behavior-based detection. This involves the software application observing the habits of a file or program and figuring out whether it is malicious based on its actions. A malware program might be discovered if it tries to erase important system files or encrypt personal data. In order to produce a piece of malware that is undetectable by behavior-based detection, a developer would need to produce a file or program that does not display any destructive habits.
A 3rd technique that antivirus software utilizes to find malware is heuristic-based detection. This includes the software looking for signs that a file or program may be destructive, even if it does not match the signature of any recognized piece of malware. A file might be flagged as being suspicious if it is extremely large or if it includes code that is normally utilized by malware programs. In order to develop a piece of malware that is undetected by heuristic-based detection, a developer would need to create a file or program that does not show any of the signs that are normally connected with malware.
In general, it would be very difficult to produce a malware program that is undetected by present anti-viruses software. This is since anti-viruses software uses a variety of different methods to eliminate and detect malware, and a programmer would require to be acquainted with all 5 types of malware (Link Home Page) these approaches in order to avoid detection.