This detection rule is aimed at identifying URLs that utilize IPv4-mapped IPv6 addresses, specifically formatted as '[::ffff:xxxx:xxxx]'. This format can often indicate attempts to obfuscate malicious links to evade detection mechanisms in cybersecurity systems. The detection mechanism involves monitoring inbound traffic where the rule checks any links present in the URL for this specific IPv6 format through a regex pattern. By targeting these obfuscated URLs, the rule helps to prevent various types of cyber attacks such as credential phishing and malware distribution. This is particularly critical as attackers are increasingly adopting techniques designed to bypass conventional detection strategies, and recognizing such patterns enhances defense capabilities.