alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING WebDAV Retrieving .dll"; flow:established,to_server; http.method; content:"PROPFIND"; http.uri; content:".dll"; endswith; http.user_agent; content:"Microsoft-WebDAV-MiniRedir/"; startswith; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; classtype:bad-unknown; sid:2047743; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_08_25, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27, reviewed_at 2023_08_25; target:src_ip;)