File: smtp.rules

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# (C) Copyright 2001-2004, Martin Roesch, Brian Caswell, et al.
#    All rights reserved.
# $Id: smtp.rules,v 1.44.2.2 2005/03/01 18:57:08 bmc Exp $
#-----------
# SMTP RULES
#-----------

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP RCPT TO overflow"; flow:to_server,established; content:"rcpt to|3A|"; nocase; isdataat:300,relative; pcre:"/^RCPT TO\x3a\s[^\n]{300}/ism"; reference:bugtraq,2283; reference:bugtraq,9696; reference:cve,2001-0260; classtype:attempted-admin; sid:654; rev:14;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP chameleon overflow"; flow:to_server,established; content:"HELP"; nocase; isdataat:500,relative; pcre:"/^HELP\s[^\n]{500}/ism"; reference:arachnids,266; reference:bugtraq,2387; reference:cve,1999-0261; classtype:attempted-admin; sid:657; rev:12;)
alert tcp $EXTERNAL_NET 113 -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 8.6.9 exploit"; flow:to_server,established; content:"|0A|D/"; reference:arachnids,140; reference:bugtraq,2311; reference:cve,1999-0204; classtype:attempted-admin; sid:655; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP exchange mime DOS"; flow:to_server,established; content:"charset = |22 22|"; nocase; reference:bugtraq,1869; reference:cve,2000-1006; reference:nessus,10558; classtype:attempted-dos; sid:658; rev:10;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP expn decode"; flow:to_server,established; content:"expn"; nocase; content:"decode"; nocase; pcre:"/^expn\s+decode/smi"; reference:arachnids,32; reference:cve,1999-0096; reference:nessus,10248; classtype:attempted-recon; sid:659; rev:9;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP expn root"; flow:to_server,established; content:"expn"; nocase; content:"root"; nocase; pcre:"/^expn\s+root/smi"; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; classtype:attempted-recon; sid:660; rev:10;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP expn *@"; flow:to_server,established; content:"expn"; nocase; content:"*@"; pcre:"/^expn\s+\*@/smi"; reference:cve,1999-1200; classtype:misc-attack; sid:1450; rev:5;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP majordomo ifs"; flow:to_server,established; content:"eply-to|3A| a~.`/bin/"; reference:arachnids,143; reference:bugtraq,2310; reference:cve,1999-0207; reference:cve,1999-0208; classtype:attempted-admin; sid:661; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 5.5.5 exploit"; flow:to_server,established; content:"mail from|3A| |22 7C|"; nocase; reference:arachnids,119; reference:cve,1999-0203; reference:nessus,10258; classtype:attempted-admin; sid:662; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP rcpt to command attempt"; flow:to_server,established; content:"rcpt to|3A|"; nocase; pcre:"/^rcpt\s+to\:\s*[|\x3b]/smi"; reference:arachnids,172; reference:bugtraq,1; reference:cve,1999-0095; classtype:attempted-admin; sid:663; rev:14;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP RCPT TO decode attempt"; flow:to_server,established; content:"rcpt to|3A|"; nocase; content:"decode"; distance:0; nocase; pcre:"/^rcpt to\:\s*decode/smi"; reference:arachnids,121; reference:bugtraq,2308; reference:cve,1999-0203; classtype:attempted-admin; sid:664; rev:15;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 5.6.5 exploit"; flow:to_server,established; content:"MAIL FROM|3A| |7C|/usr/ucb/tail"; nocase; reference:arachnids,122; reference:bugtraq,2308; reference:cve,1999-0203; classtype:attempted-user; sid:665; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 8.6.10 exploit"; flow:to_server,established; content:"Croot|0D 0A|Mprog, P=/bin/"; reference:arachnids,123; reference:bugtraq,2311; reference:cve,1999-0204; classtype:attempted-user; sid:667; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 8.6.10 exploit"; flow:to_server,established; content:"Croot|09 09 09 09 09 09 09|Mprog,P=/bin"; reference:arachnids,124; reference:bugtraq,2311; reference:cve,1999-0204; classtype:attempted-user; sid:668; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 8.6.9 exploit"; flow:to_server,established; content:"|0A|Croot|0A|Mprog"; reference:arachnids,142; reference:bugtraq,2311; reference:cve,1999-0204; classtype:attempted-user; sid:669; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 8.6.9 exploit"; flow:to_server,established; content:"|0A|C|3A|daemon|0A|R"; reference:arachnids,139; reference:bugtraq,2311; reference:cve,1999-0204; classtype:attempted-user; sid:670; rev:7;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP sendmail 8.6.9c exploit"; flow:to_server,established; content:"|0A|Croot|0D 0A|Mprog"; reference:arachnids,141; reference:bugtraq,2311; reference:cve,1999-0204; classtype:attempted-user; sid:671; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP vrfy decode"; flow:to_server,established; content:"vrfy"; nocase; content:"decode"; distance:1; nocase; pcre:"/^vrfy\s+decode/smi"; reference:arachnids,373; reference:bugtraq,10248; reference:cve,1999-0096; classtype:attempted-recon; sid:672; rev:9;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP vrfy root"; flow:to_server,established; content:"vrfy"; nocase; content:"root"; distance:1; nocase; pcre:"/^vrfy\s+root/smi"; classtype:attempted-recon; sid:1446; rev:6;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP ehlo cybercop attempt"; flow:to_server,established; content:"ehlo cybercop|0A|quit|0A|"; reference:arachnids,372; classtype:protocol-command-decode; sid:631; rev:6;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP expn cybercop attempt"; flow:to_server,established; content:"expn cybercop"; reference:arachnids,371; classtype:protocol-command-decode; sid:632; rev:5;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP HELO overflow attempt"; flow:to_server,established; content:"HELO"; nocase; isdataat:500,relative; pcre:"/^HELO\s[^\n]{500}/smi"; reference:bugtraq,7726; reference:bugtraq,895; reference:cve,2000-0042; reference:nessus,10324; reference:nessus,11674; classtype:attempted-admin; sid:1549; rev:17;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP ETRN overflow attempt"; flow:to_server,established; content:"ETRN"; nocase; isdataat:500,relative; pcre:"/^ETRN\s[^\n]{500}/smi"; reference:bugtraq,7515; reference:bugtraq,1297; reference:cve,2000-0490; reference:nessus,10438; classtype:attempted-admin; sid:1550; rev:14;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP From comment overflow attempt"; flow:to_server,established; content:"From|3A|"; nocase; content:"<><><><><><><><><><><><><><><><><><><><><><>"; distance:0; content:"|28|"; distance:1; content:"|29|"; distance:1; reference:bugtraq,6991; reference:cve,2002-1337; reference:url,www.kb.cert.org/vuls/id/398025; classtype:attempted-admin; sid:2087; rev:8;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP Content-Transfer-Encoding overflow attempt"; flow:to_server,established; content:"Content-Transfer-Encoding|3A|"; nocase; isdataat:100,relative; content:!"|0A|"; within:100; reference:cve,2003-0161; reference:url,www.cert.org/advisories/CA-2003-12.html; classtype:attempted-admin; sid:2183; rev:6;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP XEXCH50 overflow attempt"; flow:to_server,established; content:"XEXCH50"; nocase; pcre:"/^XEXCH50\s+-\d/smi"; reference:bugtraq,8838; reference:cve,2003-0714; reference:nessus,11889; reference:url,www.microsoft.com/technet/security/bulletin/MS03-046.mspx; classtype:attempted-admin; sid:2253; rev:7;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP EXPN overflow attempt"; flow:to_server,established; content:"EXPN"; nocase; pcre:"/^EXPN[^\n]{255,}/smi"; reference:bugtraq,6991; reference:bugtraq,7230; reference:cve,2002-1337; reference:cve,2003-0161; classtype:attempted-admin; sid:2259; rev:5;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP VRFY overflow attempt"; flow:to_server,established; content:"VRFY"; nocase; pcre:"/^VRFY[^\n]{255,}/smi"; reference:bugtraq,6991; reference:bugtraq,7230; reference:cve,2002-1337; reference:cve,2003-0161; classtype:attempted-admin; sid:2260; rev:5;)

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SEND FROM sendmail prescan too many addresses overflow"; flow:to_server,established; content:"SEND FROM|3A|"; nocase; pcre:"/^SEND FROM\x3a\s*[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?</smi"; reference:bugtraq,6991; reference:cve,2002-1337; reference:nessus,11316; classtype:attempted-admin; sid:2261; rev:6;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SEND FROM sendmail prescan too long addresses overflow"; flow:to_server,established; content:"SEND FROM|3A|"; nocase; pcre:"/^SEND FROM\x3a\s+[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}/smi"; reference:bugtraq,7230; reference:cve,2003-0161; classtype:misc-attack; sid:2262; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SAML FROM sendmail prescan too many addresses overflow"; flow:to_server,established; content:"SAML FROM|3A|"; nocase; pcre:"/^SAML FROM\x3a\s*[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?</smi"; reference:bugtraq,6991; reference:cve,2002-1337; classtype:attempted-admin; sid:2263; rev:6;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SAML FROM sendmail prescan too long addresses overflow"; flow:to_server,established; content:"SAML FROM|3A|"; nocase; pcre:"/^SAML FROM\x3a\s+[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}/smi"; reference:bugtraq,7230; reference:cve,2003-0161; classtype:misc-attack; sid:2264; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SOML FROM sendmail prescan too many addresses overflow"; flow:to_server,established; content:"SOML FROM|3A|"; nocase; pcre:"/^SOML FROM\x3a\s*[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?</smi"; reference:bugtraq,6991; reference:cve,2002-1337; classtype:attempted-admin; sid:2265; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SOML FROM sendmail prescan too long addresses overflow"; flow:to_server,established; content:"SOML FROM|3A|"; nocase; pcre:"/^SOML FROM\x3a\s+[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}/smi"; reference:bugtraq,7230; reference:cve,2003-0161; classtype:misc-attack; sid:2266; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP MAIL FROM sendmail prescan too many addresses overflow"; flow:to_server,established; content:"MAIL FROM|3A|"; nocase; pcre:"/^MAIL FROM\x3a\s*[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?</smi"; reference:bugtraq,6991; reference:cve,2002-1337; classtype:attempted-admin; sid:2267; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP MAIL FROM sendmail prescan too long addresses overflow"; flow:to_server,established; content:"MAIL FROM|3A|"; nocase; pcre:"/^MAIL FROM\x3a\s+[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}/smi"; reference:bugtraq,7230; reference:cve,2003-0161; classtype:attempted-admin; sid:2268; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP RCPT TO sendmail prescan too many addresses overflow"; flow:to_server,established; content:"RCPT TO|3A|"; nocase; pcre:"/^RCPT TO\x3a\s*[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?<[^\n]*?</smi"; reference:bugtraq,6991; reference:cve,2002-1337; classtype:attempted-admin; sid:2269; rev:4;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP RCPT TO sendmail prescan too long addresses overflow"; flow:to_server,established; content:"RCPT TO|3A|"; nocase; pcre:"/^RCPT TO\x3a\s*[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}\x3b[\w\s@\.]{200,}/smi"; reference:bugtraq,7230; reference:cve,2003-0161; classtype:attempted-admin; sid:2270; rev:5;)
alert tcp $SMTP_SERVERS 25 -> $EXTERNAL_NET any (msg:"SMTP AUTH LOGON brute force attempt"; flow:from_server,established; content:"Authentication unsuccessful"; offset:54; nocase; threshold:type threshold, track by_dst, count 5, seconds 60; classtype:suspicious-login; sid:2275; rev:2;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP WinZip MIME content-type buffer overflow"; flow:to_server, established; content:"Content-Type|3A|"; nocase; pcre:"/name=[^\r\n]*?\.(mim|uue|uu|b64|bhx|hqx|xxe)/smi"; pcre:"/(name|id|number|total|boundary)=\s*[^\r\n\x3b\s\x2c]{300}/smi"; reference:bugtraq,9758; reference:cve,2004-0333; reference:nessus,12621; classtype:attempted-user; sid:2487; rev:7;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP WinZip MIME content-disposition buffer overflow"; flow:to_server, established; content:"Content-Type|3A|"; nocase; pcre:"/name=[^\r\n]*?\.(mim|uue|uu|b64|bhx|hqx|xxe)/smi"; content:"Content-Disposition|3A|"; nocase; pcre:"/name=\s*[^\r\n\x3b\s\x2c]{300}/smi"; reference:bugtraq,9758; reference:cve,2004-0333; reference:nessus,12621; classtype:attempted-user; sid:2488; rev:7;)


alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP SSLv3 invalid data version attempt"; flow:to_server,established; content:"|16 03|"; depth:2; content:"|01|"; depth:1; offset:5; content:!"|03|"; depth:1; offset:9; reference:bugtraq,10115; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:attempted-dos; sid:2504; rev:8;)

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP Client_Hello overflow attempt"; flow:to_server,established; content:"|01|"; depth:1; offset:2; byte_test:2,>,0,6; byte_test:2,!,0,8; byte_test:2,!,16,8; byte_test:2,>,20,10; content:"|8F|"; depth:1; offset:11; byte_test:2,>,32768,0,relative; reference:bugtraq,10116; reference:cve,2003-0719; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:attempted-admin; sid:2519; rev:9;)

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP SSLv3 Client_Hello request"; flow:to_server,established; flowbits:isnotset,sslv3.client_hello.request; content:"|16 03|"; depth:2; content:"|01|"; depth:1; offset:5; flowbits:set,sslv3.client_hello.request; flowbits:noalert; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:protocol-command-decode; sid:2538; rev:5;)
alert tcp $SMTP_SERVERS 465 -> $EXTERNAL_NET any (msg:"SMTP SSLv3 Server_Hello request"; flow:to_client,established; flowbits:isset,sslv3.client_hello.request; content:"|16 03|"; depth:2; content:"|02|"; depth:1; offset:5; flowbits:set,sslv3.server_hello.request; flowbits:noalert; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:protocol-command-decode; sid:2539; rev:5;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP SSLv3 invalid Client_Hello attempt"; flow:to_server,established; flowbits:isset,sslv3.server_hello.request; content:"|16 03|"; depth:2; content:"|01|"; depth:1; offset:5; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:attempted-dos; sid:2540; rev:5;)


alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP STARTTLS attempt"; flow:to_server,established; content:"STARTTLS|0D 0A|"; within:10; flowbits:set,starttls.attempt; flowbits:noalert; classtype:protocol-command-decode; sid:2527; rev:3;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP TLS SSLv3 invalid data version attempt"; flow:to_server,established; flowbits:isset,starttls.attempt; content:"|16 03|"; depth:2; content:"|01|"; depth:1; offset:5; content:!"|03|"; depth:1; offset:9; reference:bugtraq,10115; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:attempted-dos; sid:2541; rev:7;)

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP TLS PCT Client_Hello overflow attempt"; flow:to_server,established; flowbits:isset,starttls.attempt; content:"|01|"; depth:1; offset:2; byte_test:2,>,0,6; byte_test:2,!,0,8; byte_test:2,!,16,8; byte_test:2,>,20,10; content:"|8F|"; depth:1; offset:11; byte_test:2,>,32768,0,relative; reference:bugtraq,10116; reference:cve,2003-0719; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:attempted-admin; sid:2528; rev:7;)

alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP TLS SSLv3 Client_Hello request"; flow:to_server,established; flowbits:isset,starttls.attempt; flowbits:isnotset,sslv3.client_hello.request; content:"|16 03|"; depth:2; content:"|01|"; depth:1; offset:5; flowbits:set,sslv3.client_hello.request; flowbits:noalert; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:protocol-command-decode; sid:2542; rev:5;)
alert tcp $SMTP_SERVERS 25 -> $EXTERNAL_NET any (msg:"SMTP TLS SSLv3 Server_Hello request"; flow:to_client,established; flowbits:isset,sslv3.client_hello.request; content:"|16 03|"; depth:2; content:"|02|"; depth:1; offset:5; flowbits:set,sslv3.server_hello.request; flowbits:noalert; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:protocol-command-decode; sid:2543; rev:5;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP TLS SSLv3 invalid Client_Hello attempt"; flow:to_server,established; flowbits:isset,sslv3.server_hello.request; content:"|16 03|"; depth:2; content:"|01|"; depth:1; offset:5; reference:cve,2004-0120; reference:nessus,12204; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:attempted-dos; sid:2544; rev:5;)


alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP MAIL FROM overflow attempt"; flow:to_server,established; content:"MAIL FROM"; nocase; isdataat:260; content:!"|0A|"; within:256; reference:bugtraq,7506; reference:bugtraq,10290; reference:cve,2004-0399; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2590; rev:3;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP From command overflow attempt"; flow:to_server,established; content:"From"; nocase; pcre:"/^From\s{65,}\x3a/smi"; reference:bugtraq,10291; reference:cve,2004-0400; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2591; rev:2;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP ReplyTo command overflow attempt"; flow:to_server,established; content:"ReplyTo"; nocase; pcre:"/^ReplyTo\s{65,}\x3a/smi"; reference:bugtraq,10291; reference:cve,2004-0400; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2592; rev:2;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP Sender command overflow attempt"; flow:to_server,established; content:"Sender"; nocase; pcre:"/^Sender\s{65,}\x3a/smi"; reference:bugtraq,10291; reference:cve,2004-0400; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2593; rev:2;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP To command overflow attempt"; flow:to_server,established; content:"To"; nocase; pcre:"/^To\s{65,}\x3a/smi"; reference:bugtraq,10291; reference:cve,2004-0400; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2594; rev:2;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP CC command overflow attempt"; flow:to_server,established; content:"CC"; nocase; pcre:"/^CC\s{65,}\x3a/smi"; reference:bugtraq,10291; reference:cve,2004-0400; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2595; rev:2;)
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP BCC command overflow attempt"; flow:to_server,established; content:"BCC"; nocase; pcre:"/^BCC\s{65,}\x3a/smi"; reference:bugtraq,10291; reference:cve,2004-0400; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2596; rev:2;)