# (C) Copyright 2001,2002, Martin Roesch, Brian Caswell, et al.
#    All rights reserved.
# $Id: bad-traffic.rules,v 1.18.2.2 2003/02/07 22:04:40 cazz Exp $
#------------------
# BAD TRAFFIC RULES
#------------------
# These signatures are representitive of traffic that should never be seen on
# any network.  None of these signatures include datagram content checking
# and are extremely quick signatures
#

alert tcp $EXTERNAL_NET any <> $HOME_NET 0 (msg:"BAD TRAFFIC tcp port 0 traffic"; classtype:misc-activity; sid:524; rev:5;)
alert udp $EXTERNAL_NET any <> $HOME_NET 0 (msg:"BAD TRAFFIC udp port 0 traffic"; reference:cve,CVE-1999-0675; reference:nessus,10074; classtype:misc-activity; sid:525; rev:4;)
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"BAD TRAFFIC data in TCP SYN packet"; flags:S; dsize:>6; reference:url,www.cert.org/incident_notes/IN-99-07.html; sid:526;  classtype:misc-activity; rev:4;)
alert ip any any <> 127.0.0.0/8 any (msg:"BAD TRAFFIC loopback traffic"; classtype:bad-unknown; reference:url,rr.sans.org/firewall/egress.php; sid:528; rev:3;)
alert ip any any -> any any (msg:"BAD TRAFFIC same SRC/DST"; sameip; reference:cve,CVE-1999-0016; reference:url,www.cert.org/advisories/CA-1997-28.html; classtype:bad-unknown; sid:527; rev:3;)
alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"BAD TRAFFIC ip reserved bit set"; fragbits:R; sid:523;  classtype:misc-activity; rev:3;)
alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"BAD TRAFFIC 0 ttl"; ttl:0; reference:url,www.isi.edu/in-notes/rfc1122.txt; reference:url,support.microsoft.com/default.aspx?scid=kb\;EN-US\;q138268; sid:1321; classtype:misc-activity; rev:5;)
alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"BAD TRAFFIC bad frag bits"; fragbits:MD; sid:1322; classtype:misc-activity; rev:4;)
alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"BAD TRAFFIC Unassigned/Reserved IP protocol"; ip_proto:>134; classtype:non-standard-protocol; sid:1627; rev:1;)
alert tcp any any -> [232.0.0.0/8,233.0.0.0/8,239.0.0.0/8] any (msg:"BAD TRAFFIC syn to multicast address"; flags:S+; classtype:bad-unknown; sid:1431; rev:4;)