alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"GPL DELETED login format string attempt"; flow:established,to_server; content:"LOGIN"; nocase; pcre:"/\sLOGIN\s[^\n]*?%/smi"; reference:bugtraq,10976; classtype:attempted-admin; sid:2102664; rev:4; metadata:created_at 2010_09_23, signature_severity Unknown, updated_at 2019_07_26;)