Most security advice is written as if the goal is a perfect wall. Real defenders plan for the wall being climbed. That shift is called assume breach, and it changes almost every decision you make.
Prevention is necessary, not sufficient
Patching, least privilege and firewalls still matter. They reduce how often an attacker succeeds. But a determined attacker only needs one gap, one tired administrator or one convincing email.
Assume breach asks a different set of questions:
- If this host were compromised today, would we notice?
- What could the attacker reach from there?
- How quickly could we contain it?
- How would we recover, and would we trust the recovery?
If the answer to the first question is "we would find out from a customer", detection is the gap to fix.
Visibility before automation
Alerts are only as good as the data underneath them. A defender needs:
- Endpoint telemetry: process creation, command lines, file changes, network connections.
- Identity telemetry: sign-ins, MFA changes, role assignments.
- Network telemetry: DNS, proxy, firewall and flow records.
- Application logs: authentication, administrative actions and errors.
Collecting everything is expensive and noisy. Start with the questions you need to answer, then work backwards to the sources.
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