Why? It’s not hard. They typically hash files and look for hits against a database of known vulnerabilities.
Yes and if viruses use something like base64 encoding or other methods, the hashes dont match anymore.
As far as I understood it, it is pretty easy to make your virus permanently un-hashable by just always changing some bits
The xz backdoor was a packaged file distributed with the standard packages though. It would be trivial to find.
This is obviously not about this known file.
It is about “would this scanner detect a system package from the official repos opening an ssh connection”
Sorry, I was responding to:
I HIGHLY doubt that they would detect the XZ backdoor
That doesn’t work against polymorphic malware
I think the best way is to monitor calls and behavior. Doing that is a privacy nightmare
Who’s talking about polymorphic malware? We were talking about the xz backdoor.
Oh well in that case there is no chance
