Specialized Cybersecurity & Cognitive Security
Ransomware Canary Files
Canary files are decoy documents placed where ransomware is likely to touch them first, such as shared drives and user folders. Because no legitimate user opens them, any read, modify, or encrypt event is a high-fidelity alert that can trigger containment before the real data is hit. They are cheap, fast to deploy, and effective as an early warning layer alongside backups and endpoint protection.
Points clés
- Place canaries in high-value folders and shared drives where ransomware typically starts.
- Name them to look like real documents so automated encryption touches them early.
- Alert on any access, modification, or rename of a canary file.
- Automate containment such as isolating the host when a canary triggers.
- Keep canaries readable only to the system so legitimate users never trip them.
- Rotate canary names and locations to avoid attackers learning them.
- Test alerts regularly to confirm they fire and reach responders.
- Combine canaries with immutable backups for recovery after an incident.
Questions fréquentes
Are canaries enough to stop ransomware?
No. They are an early warning, not prevention or recovery.
Do canaries cause false positives?
Rarely, if access is restricted to the system and monitored properly.
Where should I start?
Shared drives and the folders where users keep important documents.
How fast do canaries alert?
In seconds, which is why they beat most detection that waits for mass encryption.
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