Yeah, that's out of date. While AV still uses file signatures, the modern stuff is behavioral. If you have a file whose instructions use undocumented or low-level APIs, it can look like an exploit and the AV flags it. Endpoint protection products like Sentinelone also take the role of endpoint firewall, managing access to network resources, not just the OS, disk, etc. So if you start sending encrypted requests through uncommon APIs to a cloud server in China, it's gonna get you blocked.
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