alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP SITE EXEC attempt"; flow:to_server,established; content:"SITE"; nocase; content:"EXEC"; distance:0; nocase; pcre:"/^SITE\s+EXEC/smi"; reference:arachnids,317; reference:bugtraq,2241; reference:cve,1999-0080; reference:cve,1999-0955; classtype:bad-unknown; sid:2100361; rev:17; metadata:created_at 2010_09_23, cve CVE_1999_0080, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)