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; flowbits:isnotset,sslv2.client_hello.request; flowbits:isnotset,sslv3.client_hello.request; flowbits:isnotset,tlsv1.client_hello.request; 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:9;)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 PCT Client_Hello overflow attempt"; flow:to_server,established; flowbits:isset,starttls.attempt; flowbits:isnotset,sslv2.server_hello.request; flowbits:isnotset,sslv3.server_hello.request; flowbits:isnotset,tlsv1.server_hello.request; content:"|01|"; depth:1; offset:2; byte_test:2,>,0,5; byte_test:2,!,0,7; byte_test:2,!,16,7; byte_test:2,>,20,9; 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:13;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP SSLv3 Client_Hello request"; flow:to_server,established; flowbits:isnotset,sslv2.client_hello.request; flowbits:isnotset,sslv3.client_hello.request; flowbits:isnotset,tlsv1.client_hello.request; content:"|16 03 00|"; depth:3; content:"|01|"; depth:1; offset:5; flowbits:set,sslv3.client_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:2542; rev:6;)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:6;)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:2544; rev:6;)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,10290; reference:bugtraq,7506; reference:cve,2004-0399; reference:url,www.guninski.com/exim1.html; classtype:attempted-admin; sid:2590; rev:4;)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;)alert tcp $SMTP_SERVERS 465 -> $EXTERNAL_NET any (msg:"SMTP SSLv2 Server_Hello request"; flow:from_server,established; flowbits:isset,sslv2.client_hello.request; content:"|04|"; depth:1; offset:2; content:"|00 02|"; depth:2; offset:5; flowbits:set,sslv2.server_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:3497; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP SSLv2 Client_Hello with pad request"; flow:to_server,established; flowbits:isnotset,sslv2.client_hello.request; flowbits:isnotset,sslv3.client_hello.request; flowbits:isnotset,tlsv1.client_hello.request; byte_test:1,<,128,0; content:"|01|"; depth:1; offset:3; content:"|00 02|"; depth:2; offset:6; flowbits:set,sslv2.client_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:3494; rev:1;)alert tcp $SMTP_SERVERS 465 -> $EXTERNAL_NET any (msg:"SMTP TLSv1 Server_Hello request"; flow:to_client,established; flowbits:isset,tlsv1.client_hello.request; content:"|16 03 01|"; depth:3; content:"|02|"; depth:1; offset:5; flowbits:set,tlsv1.server_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:3498; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP TLSv1 Client_Hello request"; flow:to_server,established; flowbits:isnotset,sslv2.client_hello.request; flowbits:isnotset,sslv3.client_hello.request; flowbits:isnotset,tlsv1.client_hello.request; content:"|16 03 01|"; depth:3; content:"|01|"; depth:1; offset:5; flowbits:set,tlsv1.client_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:3495; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP Content-Encoding overflow attempt"; flow:to_server,established; content:"Content-Encoding|3A|"; nocase; pcre:"/Content-Encoding\x3A[^\r\n]{300,}/i"; reference:bugtraq,7419; reference:cve,2003-0113; reference:url,www.microsoft.com/technet/security/bulletin/MS03-015.mspx; classtype:attempted-admin; sid:3462; rev:2;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP TLSv1 Client_Hello via SSLv2 handshake request"; flow:to_server,established; flowbits:isnotset,sslv2.client_hello.request; flowbits:isnotset,sslv3.client_hello.request; flowbits:isnotset,tlsv1.client_hello.request; byte_test:1,>,127,0; content:"|01|"; depth:1; offset:2; content:"|03 01|"; depth:2; offset:3; flowbits:set,tlsv1.client_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:3496; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP SSLv2 Client_Hello request"; flow:to_server,established; flowbits:isnotset,sslv2.client_hello.request; flowbits:isnotset,sslv3.client_hello.request; flowbits:isnotset,tlsv1.client_hello.request; byte_test:1,>,127,0; content:"|01|"; depth:1; offset:2; content:"|00 02|"; depth:2; offset:5; flowbits:set,sslv2.client_hello.request; flowbits:noalert; classtype:protocol-command-decode; sid:3493; rev:2;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP Content-Type overflow attempt"; flow:to_server,established; content:"Content-Type|3A|"; nocase; pcre:"/Content-Type\x3A[^\r\n]{300,}/i"; reference:bugtraq,7419; reference:cve,2003-0113; reference:url,www.microsoft.com/technet/security/bulletin/MS03-015.mspx; classtype:attempted-admin; sid:3461; rev:2;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 465 (msg:"SMTP PCT Client_Hello overflow attempt"; flow:to_server,established; flowbits:isnotset,sslv2.server_hello.request; flowbits:isnotset,sslv3.server_hello.request; flowbits:isnotset,tlsv1.server_hello.request; content:"|01|"; depth:1; offset:2; byte_test:2,>,0,5; byte_test:2,!,0,7; byte_test:2,!,16,7; byte_test:2,>,20,9; 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:3511; rev:13;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SEND overflow attempt"; flow:established,to_server; content:"SEND"; nocase; pcre:"/^\s*SEND\s+[^\n]{246}/smi"; reference:bugtraq,11238; classtype:attempted-user; sid:3655; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SAML overflow attempt"; flow:established,to_server; content:"SAML"; nocase; pcre:"/^\s*SAML\s+[^\n]{246}/smi"; reference:bugtraq,11238; classtype:attempted-user; sid:3653; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP MAIL overflow attempt"; flow:established,to_server; content:"MAIL"; nocase; pcre:"/^\s*MAIL\s+[^\n]{246}/smi"; reference:bugtraq,11238; classtype:attempted-user; sid:3656; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP SOML overflow attempt"; flow:established,to_server; content:"SOML"; nocase; pcre:"/^\s*SOML\s+[^\n]{246}/smi"; reference:bugtraq,11238; classtype:attempted-user; sid:3654; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP spoofed MIME-Type auto-execution attempt"; flow:to_server,established; content:"Content-Type|3A|"; nocase; content:"audio/"; nocase; pcre:"/Content-Type\x3A\s+audio\/(x-wav|mpeg|x-midi)/i"; content:"filename="; distance:0; nocase; pcre:"/filename=[\x22\x27]?.{1,221}\.(vbs|exe|scr|pif|bat)/i"; reference:bugtraq,2524; reference:cve,2001-0154; reference:url,www.microsoft.com/technet/security/bulletin/MS01-020.mspx; classtype:attempted-admin; sid:3682; rev:2;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP AUTH user overflow attempt"; flow:to_server,established; content:"AUTH"; nocase; pcre:"/^AUTH\s+\S+\s+[^\n]{128}/mi"; reference:bugtraq,13772; classtype:attempted-admin; sid:3824; rev:1;)alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP eXchange POP3 mail server overflow attempt"; flow:to_server,established; content:"MAIL"; depth:5; nocase; pcre:"/MAIL\s+[^\s\n][^\n]{1006,}/smi"; reference:bugtraq,10180; classtype:misc-attack; sid:3815; rev:2;)