I treat LS as a privacy/anti-telemetry/anti-accident tool, not as anti malware.
Obviously it can detect malware if there’s a connection to some weird site, but it’s more like a bonus than a reliable test.
If you need to block FS access, then per app containers or VMs are the way to go. The container/VM sandboxes your files, and Little Snitch can then manage externa connectivity (you might still want to allow connection to some legit domains—-but maybe not github.com as that can be use to upload your data. I meant something like updates.someapp.com)
I believe LS has some protections against this. Never tried them, but there are config related security options, incl. protection against synthetic events. So they definitely put some thought into that.
Obviously it can detect malware if there’s a connection to some weird site, but it’s more like a bonus than a reliable test.
If you need to block FS access, then per app containers or VMs are the way to go. The container/VM sandboxes your files, and Little Snitch can then manage externa connectivity (you might still want to allow connection to some legit domains—-but maybe not github.com as that can be use to upload your data. I meant something like updates.someapp.com)