alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Topic EK Requesting PDF"; flow:established,to_server; content:".php?exp=lib"; http_uri; content:"&b="; http_uri; content:"&k="; http_uri; distance:0; pcre:"/&b=[a-f0-9]{7}&k=[a-f0-9]{32}/U"; classtype:exploit-kit; sid:2016108; rev:4; metadata:created_at 2012_12_28, confidence High, signature_severity Major, updated_at 2020_02_06;)