A new client's AWS environment had a security group open to the internet and a compromised instance driving up cost. We closed the exposure, fixed the misconfiguration behind it, and brought cost back down.
A security group was left open to 0.0.0.0/0, and a t3a instance had been compromised as a result running unauthorized workloads that pushed CPU usage and cost well above baseline.
FAQ
Through a full account audit that checked every security group, IAM policy and running workload — not just the specific instance that had already been compromised, since a real incident response has to rule out other open doors, not just close the one that's already been found.
The compromised instance was running unauthorized workloads that pushed CPU usage and cost well above baseline; once remediated, infrastructure cost dropped by roughly 30%, which is a rough proxy for how much the exposure had been costing.
A recurring audit process plus infrastructure-as-code practices so security-group rules are reviewed and version-controlled rather than changed ad hoc through the console.
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