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If it looks like malware and behaves like malware, it's probably malware.
The AV software developers look for telltale signs that the software's structure or behavior is malicious and then treat it like malware, even if no signature exists.
The older a tool or technique is, the greater the chance they will have a mechanism to detect it.
The key to making good AV software is to have a complete database of all malware signatures.
A good example of this that many of you have found is the msfvenom module in Metasploit.
The template that creates the payloads has a signature, so no matter how we re-encode our payload, it still has a known signature.
Where finding an optimal solution is impossible or impractical, heuristic methods can be used to speed up the process of finding a satisfactory solution."James Whitcomb Riley once said, "When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck." That principle summarizes heuristics succinctly.
The beauty of working with Snort is that its signature database is open and viewable to anyone.
In the screenshot below, you can see some of the rules or signatures from the file from Snort.
For instance, if a file begins to replace several system files, it's probably malware.
If a piece of software is trying make a TCP connection back to a known malicious IP address, it's probably malware.