alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT PROPFIND Flowbit Set"; flow:established,to_server; flowbits:set,ET.PROPFIND; flowbits:noalert; http.method; content:"propfind"; nocase; classtype:misc-activity; sid:2011456; rev:8; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_09_29, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2026_07_31; target:src_ip;)