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[SENDMAIL] EXPN command - rejected

[SENDMAIL] EXPN command - rejected

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Detection Logic

drop any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SENDMAIL] EXPN command - rejected"; content:"expn "; nocase; content:"[rejected]"; 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: 5000035; rev:10;)

Field Validations

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