alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT LightsOut EK Payload Download"; flow:to_server,established; content:".php?dwl="; http_uri; fast_pattern:only; nocase; pcre:"/\.php\?dwl=[a-z]+$/U"; reference:url,blogs.cisco.com/security/watering-hole-attacks-target-energy-sector; classtype:exploit-kit; sid:2017529; rev:4; metadata:created_at 2013_09_30, confidence High, signature_severity Major, updated_at 2019_07_26;)