October 14, 2021

Based on WHOIS queries, can IP addresses owned by Microsoft that don’t state they’re Azure related be rented and used for C2?

Whenever I look up IP addresses in traffic and it says it’s registered to Microsoft, I can’t tell if it could be an attacker renting a cloud service from them. I’d think that all cloud services would be registered to Microsoft Azure? Can I completely whitelist all IPs with Microsoft as its registrant?

See differences between the two:

https://whois.domaintools.com/104.40.10.2

https://whois.domaintools.com/microsoft.com

In the second link, I can see the name servers are Azure. In the first link, idk if anything is rentable for APTs to use.

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