Team PresidioSec
Incident response and cyber resilience for SMEs
2026-04-11
First 30 minutes
Name a coordinator, centralize communication, stop improvised decisions and capture the first observable signals.
If propagation is suspected, immediately evaluate isolation of endpoints, shared services and remote access. Every action should be logged with timestamp and owner.
First hour and first 24 hours
In the first hour map systems, backups, business impact and possible GDPR or NIS2 implications. In the first 24 hours prepare notifications, continuity measures and criteria for external escalation.
The checklist exists so critical steps are not forgotten. But it only works if someone uses it as a decision tool instead of a retrospective tick-box list.
Sources
Related reads
Incident Response
The first 24 hours of a cyber incident: what to do
A practical framework for isolation, communication and notifications in the first 24 hours, when method materially changes the outcome.
Ransomware
Ransomware: what to do in the first hours without making it worse
A guide for SMEs on isolation, internal communication, evidence capture and the decisions that must be made immediately when ransomware appears.
GDPR
GDPR 72 hours: how an SME should handle a possible breach notification
When the 72-hour clock really starts, which facts matter and how to avoid delays and improvised notifications during an incident.