Cloudflare Tunnel Installed as Windows Service via PowerShell for Covert C2
Detects the installation of the Cloudflare Tunnel (cloudflared) utility as a Windows service, often used by threat actors to establish persistent, outbound command-and-control (C2) channels that bypass standard network perimeter controls. This rule monitors for PowerShell-based downloads from GitHub, silent MSI-based installation, and the execution of the 'service install' command.
Sigma
