Adaptive Security Analyzer IIS or the ASA IIS protects Windows-based web servers from known and unknown vulnerabilities. It also protects them from various types of internal system misuse. It is comprised of two key components. The first is implemented as an ISAPI filter which collects and feeds data to the Adaptive security Engine (ASE) The first collects data and feeds it to the adaptive Security Engine. The second is a continuous monitoring of the vital aspects of IIS operation. ASE detects abnormal requests and other unusual traffic.
Source: https://thehackernews.com/2010/12/adaptive-security-analyzer-iis-tool-to.html