Malware
Backdoor
Backdoor
A hidden access path that lets an attacker return without normal authentication.
Fiche de sensibilisationPrête à diffuser à vos équipes ou clients
MIGHT YOU BE AFFECTED?
Turn knowledge into action.
How does this work?
It bypasses usual controls and provides lasting secret access, often after a vulnerability is exploited or a Trojan installed.
REAL-WORLD EXAMPLE
« A hidden service listens on an unusual port and enables access even after passwords change. »
Typical sequence
- 1Gain initial access
- 2Install hidden access
- 3Return later
Warning signs
- Unknown account or service
- Unexpected network port
- Persistent outbound connection
How to protect yourself
- Use endpoint detection and inventory services
- Segment networks and minimise privileges
- Patch vulnerabilities promptly
If you think you are affected
Isolate the system and investigate the initial intrusion before removing the backdoor. Revoke sessions, keys and secrets that may have been compromised.
Last updated: 6 September 2026