I'm pretty sure that crack tools are detected as malware or viruses because, by definition, they are. Its specific purpose is to modify programs and files so that they do not work as designed. They delete the verification files, modify the state of the registry, and do everything they can to prevent their target from working as intended. Sometimes, the crack is infected.
Or the way it looks raises a flag for antivirus software with heuristic detection. After all, antivirus software is specifically designed to detect executables that have been tampered with. And the manipulation applies to both harmless decryption code and infected software. The goal of a crack is to alter an exe file, which is a red flag for the activity of the virus, even if it isn't.
It is a way (which could be called programs) that makes protected programs work perfectly without the need to buy or pay money for those programs. Which means that a crack breaks the program's protection so you can use it completely. What is the risk posed by the crack virus? There is no rule about it, there are some parts that produce crack for free and other parts that sell it. There is no rule or confirmation that crack is dangerous or not because it is a program that was mostly produced by unknown parties.
Even though crack allows you, the user, to use the program for free (that is, you are achieving your goal with the program and making it work the way you want it), AV doesn't care about that. This finding suggests that the impact of crack cocaine use on HIV transmission may be related to economic factors and possibly to the exchange of sex for money to buy cocaine or to the exchange of sex for drugs. Even if the antivirus takes one, users usually put it on exception and they don't care, based on the assumption that “antiviruses don't like decrypted software, whereas, in fact, decrypted software and free movies contain malware. Other than that, decrypted software can infect your device or make it more vulnerable to future infections.
What I'm trying to say is that just because a crack seems to work well, you shouldn't sit back and relax. Antiviruses detect cracks because the crack sows some malware, the decrypted code triggers a false positive, and because antivirus companies apply the fight against piracy, especially in enterprise antivirus software, with heuristic or signature-based detection. Often, the person who installed that software and manages it wants to know that decrypted software has been installed on their machine. Crack is done by people or companies who discovered how to unlock or undo the protection of a program.
For example, if you're a fan of Xbox Live, testing your chances with cracked games could be a terrible idea. I know that part of the crack is a fake file to lock your computer or steal private information, but most of them can make the software run in full version. It is not uncommon for known harmless crack signatures to be permanently blacklisted by antivirus software, even if those cracks do not infect your devices and do not collect personal information. But there are also cases where security software does not need to analyze suspicious features or behavior to detect cracks.
It is not necessary to install the program and install the crack on it, it is enough to install the decrypted software to make it work fully.