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Custom IPS rules for Log4Shell CVE-2021-44228

Hoping for some help on this one.  If anyone is familiar with how to create custom IPS rules in Sophos XG...

I know there are some IPS rules already for this CVE, but I saw on our web server that the pattern is changing.

How can I make a custom rule that will block something like this that's being seen in IIS logs?

${jndi:${lower:l}${lower:d}a${lower:p}

I'm not sure of the syntax needed to put that into the firewall.  Also I couldn't really tell what patterns the other 3 IPS rules are using.

Some step by step instructions would be good and would probably help out others as well.

Thanks!



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