Signature-based detection is extremely useful.
But it has a fundamental limitation:
The indicator needs to be known.
Consider a new malicious document.
Its hash is unknown.
No existing signature matches it.
Static inspection looks mostly normal.
Then it runs.
It creates a process.
The process injects code into memory.
It contacts an external host.
It downloads another payload.
Now we have something more useful than a hash:
behavior.
This is why sandboxing remains an important security architecture pattern.
A simplified flow looks like:
Unknown File
→ Isolated Analysis
→ Static + Dynamic Analysis
→ Memory Inspection
→ Verdict
SonicWall Capture ATP combines sandboxing with RTDMI, its Real-Time Deep Memory Inspection technology.
It can also use a pattern called Block Until Verdict where selected unknown files are held before delivery.
The broader principle is vendor-neutral:
Known threats can often be identified by indicators. Unknown threats frequently require behavior.
And neither approach replaces endpoint security, backups or segmentation.
Practical SonicWall example:
https://sistro.net/sonicwall-capture-atp-rtdmi-ransomware-zero-day
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