C9 Posted on Apr 29 • Originally published at c9lab.com on Apr 29 What are Indicators of Compromise (IOC)? Indicators of Compromise, or IOCs, are basically warning signs that something isn’t right inside a system, network, or application. You usually don’t “see” the attack happening in real time. What you notice instead are small, unusual activities that don’t quite add up. For example, a system suddenly connecting to an unknown IP, multiple failed login attempts followed by one successful login, or a spike in data being sent outside the network. Sometimes it’s even simpler things like a password getting changed without context, a new user account appearing out of nowhere, or files showing up that no one remembers creating. On their own, these might not look serious. But when you step back and connect the dots, they start telling a story. That’s exactly what IOCs do. They act as pieces of evidence. When analysed properly, they help confirm whether a system has actually been compromised.…