Falco is a cloud-native runtime security tool for Linux and containers. It watches kernel events, such as system calls, process starts, file access, and network activity, then matches them against security rules to flag suspicious behavior. Because it operates close to the kernel, Falco can detect threats that traditional log-based tools may miss in fast-moving container and Kubernetes environments.
Falco matters because it gives defenders live visibility into what a workload is doing at the moment it happens. Security teams use it to alert on shell spawning inside containers, unexpected privilege use, sensitive file reads, or other signs of compromise. In attacks, malware or an intruder with host-level control may try to evade or disable this kind of monitoring by tampering with the node or its security components. For that reason, Falco is strongest when paired with hardening, least privilege, and off-node alerting.