Zyxel ZyWALL 1100 [516/829] Snort signatures

Zyxel USG 60W [516/829] Snort signatures
Chapter 30 IDP
ZyWALL/USG Series User’s Guide
516
the whole LAN is compromised. Host-based intrusions may be used to cause network-based
intrusions when the goal of the host virus is to propagate attacks on the network, or attack
computer/server operating system vulnerabilities with the goal of bringing down the computer/
server. Typical “network-based intrusions” are SQL slammer, Blaster, Nimda MyDoom etc.
Snort Signatures
You may want to refer to open source Snort signatures when creating custom ZyWALL/USG ones.
Most Snort rules are written in a single line. Snort rules are divided into two logical sections, the
rule header and the rule options as shown in the following example:
alert tcp any any -> 192.168.1.0/24 111 (content:”|00 01 a5|”; msg:”mountd access”;)
The text up to the first parenthesis is the rule header and the section enclosed in parenthesis
contains the rule options. The words before the colons in the rule options section are the option
keywords.
The rule header contains the rule's:
•Action
•Protocol
Source and destination IP addresses and netmasks
Source and destination ports information.
The rule option section contains alert messages and information on which parts of the packet
should be inspected to determine if the rule action should be taken.
These are some equivalent Snort terms in the ZyWALL/USG.
Table 211 ZyWALL/USG - Snort Equivalent Terms
ZYWALL/USG TERM SNORT EQUIVALENT TERM
Type Of Service tos
Identification id
Fragmentation fragbits
Fragmentation Offset fragoffset
Time to Live ttl
IP Options ipopts
Same IP sameip
Transport Protocol
Transport Protocol: TCP
Port (In Snort rule header)
Flow flow
Flags flags
Sequence Number seq
Ack Number ack
Window Size window
Transport Protocol: UDP (In Snort rule header)
Port (In Snort rule header)

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