alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Possible Blackhole Landing to 8 chr folder plus index.html"; flow:established,to_server; content:"/index.htm"; fast_pattern:only; http_uri; urilen:20<>21; content:!"search"; nocase; http_uri; pcre:"/^\/[A-Za-z0-9]+[A-Z]+[A-Za-z0-9]*\/index\.html?$/U"; classtype:bad-unknown; sid:2014521; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2012_04_06, deployment Perimeter, malware_family Blackhole, signature_severity Critical, tag Blackhole, tag Exploit_Kit, updated_at 2019_07_26;)