alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED BlackHole EK Variant PDF Download"; flow:established,to_server; urilen:>48; content:".php?"; http_uri; fast_pattern:only; pcre:"/\.php\?[^=]+=[^&]{10}&[^=]+=[^&]+&[^=]+=[^&]{20}((?P<sep>[^&]{2})(?P=sep)[^&]{20})*?&/U"; flowbits:set,et.BHEK.PDF; flowbits:noalert; classtype:exploit-kit; sid:2017556; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2013_10_04, deployment Perimeter, malware_family Blackhole, signature_severity Critical, tag Blackhole, tag Exploit_Kit, updated_at 2019_07_26;)