Create iRule for Ananymous Proxy Users

You can use the F5 ASM module and its Geolocation feature, more information here:

https://devcentral.f5.com/articles/the-big-ip-application-security-manager-part-7-geolocation.Upy73LHnbIU

You can also use IP Address intelligence for real-time IP reputation checks:

https://devcentral.f5.com/articles/the-big-ip-application-security-manager-part-6-ip-address-intelligence-and-whitelisting.UovlgbHnbIV

Hope this helps,

Sam