Custom objects signature - DNS query length

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Custom objects signature - DNS query length

Hello

I am trying to create a custom object / custom spyware signature based on dns-req-section that would alert when the requested domain via dns is longer than x amount of characters.
Currently I am stuck at the pattern requirement to have 7 fixed bytes. Any ideas?

 

(We are not using dns proxying)

(I'm trying to detect this: 

https://blog.talosintelligence.com/2016/06/detecting-dns-data-exfiltration.html)

 

Thank you in advance
Kind regards
Tim

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