[SENDMAIL] VRFY or EXPN root attempt

drop any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SENDMAIL] VRFY or EXPN root attempt"; content: " root"; nocase; meta_content: "%sagan%",vrfy,expn; meta_nocase; default_proto: tcp; default_dst_port: $SMTP_PORT; classtype: attempted-recon; xbits: set,recon,track ip_src, expire 86400; program: sm-mta
| sendmail; parse_src_ip: 1; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; sid: 5000034; rev:11;)