: What’s New in the IPS Signature Converter Plugin 1.0.7
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What’s New in the IPS Signature Converter Plugin 1.0.7

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What’s New in the IPS Signature Converter Plugin 1.0.7

Learn about the enhancements in the IPS Signature Converter plugin 1.0.7.
The IPS signature converter version 1.0.7 introduces the following capabilities:
Feature
Description
Support for
Startswith
and
Endswith
keywords
For better coverage of threats identified by Suricata rules, the converter now supports the following payload keywords:
  • startswith
  • endswith
The
startswith
and
endswith
keywords are ignored to prevent false-postives that might occur [due to pattern match discrepancies].
Both keywords accept no arguments and must follow the
content
keyword.
Example usage for
startswith
, which modifies the content to match at the start of the buffer:
content:"GET|20|"; startswith;
startswith
is shorthand notation for:
content:"GET|20|"; depth:4; offset:0;
Example usage for
endswith
, which modifies the content to match at the end of the buffer:
content:".php"; endswith;
Support DNS protocol and keyword
dns_query
For coverage of DNS-based threats contained in DNS requests, you can now convert Snort and Suricata rules that use the DNS protocol, which can be used in conjunction with the new keyword
dns_query
to inspect DNS request queries.
The
dns_query
keyword requires the installation of content update 8770-8365 or later. Refer to Install Content Updates for more information about installing the Applications and Threats content update package.
Example rule to detect DNS queries contained in DNS traffic:
alert dns any any -> any any (msg:”Test dns_query option”; dns_query; content:”google”; nocase; sid:1;)
  • dns_query
    referenced above is operationally equivalent to the newer
    dns.query
    .
  • When
    dns_query
    is used in a rule, all contents following it are affected.

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