If Attackers can abuse free online services, they will do for sure! Why spend time to deploy a C2 infrastructure if you have plenty of ways to use “official” services. Not only, they don't cost any money but the traffic can be hidden in the normal traffic; making them more difficult to detect. A very popular one was anonfiles[.]com. It was so abused that they closed in 2023![1]. A funny fact is that I still see lot of malicious scripts that refer to this domain. Of course, alternatives popped up here and there, like anonfile[.]la[2].
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