alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET EXPLOIT M3U File Request Flowbit Set"; flow:to_server,established; content:"GET "; depth:4; content:".m3u"; http_uri; flowbits:set,ET.m3u.download; flowbits:noalert; classtype:not-suspicious; sid:2011241; rev:3; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_22;)