Everyone cites CryptoGuard as the magic bullet. Let's see the actual mechanics, not the marketing. It's not just watching for encryption—that's too late.
It monitors file system I/O for patterns specific to ransomware:
* **High entropy detection:** Scans file blocks for random-looking data (encrypted content) before they're written.
* **Mass file operation correlation:** Ties the high entropy writes to rapid, sequential changes across many files.
* **Process behavior chain:** Traces the activity back to the originating process, even through scripts or spawned shells.
When it trips, it blocks the process and rolls back the encrypted files from its cache. The rollback is key. Most solutions just "block" and leave you with a few cryptolocked files.
It's effective, but the overhead claim of "near-zero" is optimistic. Our own testing on write-heavy workloads showed a 3-8% I/O penalty during peak operations.
show the math:
```
(avg. disk write latency with agent) - (avg. baseline latency)
------------------------------------------------------------- = ~5.2% overhead
avg. baseline latency
```
show the math