This detection rule is designed to identify DNS query requests directed towards domains affiliated with Devtunnels, specifically those queries that end with '.devtunnels.ms'. The significance of monitoring such queries stems from the potential misuse by attackers who may leverage Devtunnels to establish reverse shells or maintain persistent access within a compromised machine. As the use of Devtunnels can facilitate the bypassing of traditional security controls, it is crucial to alert on any instances of DNS resolutions to these domains. By focusing on this particular pattern in DNS traffic, the rule serves to strengthen the defensive posture against command-and-control (C2) tactics that utilize Devtunnels as a vector for network exploitation.