The cybersecurity industry has spent the last several years chasing sophisticated threats like zero-days, supply chain compromises, and AI-generated exploits. However, the most reliable entry point for attackers still hasn’t changed: stolen credentials.
Identity-based attacks remain a dominant initial access vector in breaches today. Attackers obtain valid credentials through credential stuffing from prior breach databases, password spraying against exposed services, or phishing campaigns — and use them to walk through the front door. No exploits needed. Just a valid username and password.
What makes this difficult to defend against is how unremarkable the initial access looks. A successful login from a legitimate credential doesn’t trigger the same alarms as a port scan or a malware callback. The attacker looks like an employee. Once inside, they dump and crack additional passwords, reuse those credentials to move laterally, and expand their foothold across the environment. For ransomware crews, this chain leads to encryption and extortion within hours. For nation-state actors, the same entry point supports long-term persistence and intelligence gathering.
AI Is Accelerating What Already Works
The fundamental attack pattern here hasn’t changed much. But what has changed is the speed and polish with which it gets executed. Attackers are leveraging AI to scale their operations by automating credential testing across larger target sets, writing custom tooling faster, and crafting phishing emails that are materially harder to distinguish from legitimate communications.
This acceleration puts additional pressure on already-stretched defenders. Breaches are unfolding faster, spreading further and touching more of the environment, from identity systems to cloud infrastructure to endpoints. IR teams built for a slower tempo of engagement are finding that their existing processes can’t keep pace.
A Dynamic Approach to Incident Response
This is where the way teams think about incident response matters as much as the technical controls they deploy. In SEC504, we teach the Dynamic Approach to Incident Response, or DAIR — a model designed to handle incidents of any size and shape more effectively than the traditional linear approach.
The classic model treats the process as a sequence: prepare, identify, contain, eradicate, recover, debrief. The problem isn’t the theory, it’s that real incidents don’t unfold in a straight line. New data surfaces during containment that changes what you thought the scope was. Evidence collected during eradication reveals attacker tactics you didn’t know about during initial detection. The scope almost always grows — it rarely shrinks.
DAIR accounts for this reality. After detecting and verifying an incident, response teams enter a loop: scoping the compromise, containing affected systems, eradicating the threat, and recovering operations. That loop repeats as new information emerges. Consider a credential-based…
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