I am trying to build a custom signature that is matching http header or body that contains certain regular expression. Any Ideas how to do that ? I tried Web Server signature but there I can only match HTTP header.
The only concern is that if your regex is fairly long, it may actually appear in more than one packet. The good news is that the 'string.tcp' engine will collect and analyse a steam of TCP packets, ensuring that the regex will still be detected.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...