How do AVs detect viruses? Well, they have their virus signatures, ie. In some cases, even AV scanners without live protection can interfere. This can cause anything from minor performance hiccups to system crashes. Two AVs with live protection can start to protect you from each other's suspicious behavior. At this point you should see where this is going. So AVs have guards that watch if their code hooks are still in place and reinstalls them if necessary. If you were creating a virus, wouldn't you also like to be able to intercept system operations, for example to prevent AV from scanning virus files? Unfortunately, patching of OS code is not only necessary for AVs, but also suspicious. Otherwise, it will take appropriate action to prevent malicious software from doing any damage. If it does, it will call actual "write file" function. AV will inspect it and decide if it looks OK. But the function was patched by AV and program's request will be redirected to AV instead. When a program attempts to write to a file, it will call the "write file" function. Operating systems don't provide such capabilities out-of-the-box, so AVs use less conventional methods to achieve this effect.įor example, it can replace the "write file" function that OS provides with its custom one. It patches some of OS code so that it can observe whatever programs attempt to do and prevent them from doing so, if necessary. It's the live protection that can cause AVs to interfere.ĪV software with live protection features deeply integrates itself into operating system. Plain antivirus scanners can coexist without any issues.
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