# alert tcp $SMTP_SERVERS any -> $EXTERNAL_NET 25 (msg:"ET POLICY SMTP Confidential"; flow:to_server,established; content:"Subject|3A|"; pcre:"/(?<!//)\Wconfidential[^\w/]/ism"; classtype:policy-violation; reference:url,doc.emergingthreats.net/bin/view/Main/2002460; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Classified_Information; sid:2002460; rev:3;)

Added 2009-02-10 20:53:05 UTC

# alert tcp $SMTP_SERVERS any -> $EXTERNAL_NET 25 (msg:"ET POLICY SMTP Confidential"; flow:to_server,established; content:"Subject|3A|"; pcre:"/(?<!//)\Wconfidential[^\w/]/ism"; classtype:policy-violation; reference:url,doc.emergingthreats.net/bin/view/Main/2002460; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Classified_Information; sid:2002460; rev:3;)

Added 2009-02-10 20:53:05 UTC

# alert tcp $SMTP_SERVERS any -> $EXTERNAL_NET 25 (msg:"ET POLICY SMTP Confidential"; flow:to_server,established; content:"Subject|3A|"; pcre:"/(?<!//)\Wconfidential[^\w/]/ism"; classtype:policy-violation; sid:2002460; rev:2;)

Added 2008-01-31 18:48:08 UTC

# alert tcp $SMTP_SERVERS any -> $EXTERNAL_NET 25 (msg:"ET POLICY SMTP Confidential"; flow:to_server,established; content:"Subject|3A|"; pcre:"/(?<!//)\Wconfidential[^\w/]/ism"; classtype:policy-violation; sid:2002460; rev:2;)

Added 2008-01-31 18:48:08 UTC

# alert tcp $SMTP_SERVERS any -> $EXTERNAL_NET 25 (msg:"BLEEDING-EDGE POLICY SMTP Confidential"; flow:to_server,established; content:"Subject|3A|"; pcre:"/(?<!//)\Wconfidential[^\w/]/ism"; classtype:policy-violation; sid:2002460; rev:1;)