@briankrebs
The number I keep coming back to is 28. One infected endpoint showed up in 28 separate proxy pools, which means anyone with a few dollars and a rotating proxy plan could send traffic out of an Executive Office of the President address. Layer3 wasn't even looking for the White House. They bought generic access and some of their requests happened to exit from AS2650.
A proxy SDK keeps a persistent outbound connection to someone else's infrastructure and relays whatever it is told to. If malware did that we would call it a C2 implant. Synthient's Kimwolf work already showed that a buggy SDK can give the proxy customer a path into the local network, not just an exit IP.
This ran for 26 of 30 days on a Windows 11 machine running consumer software, and a startup watching from outside caught it before anyone inside did. Spur, Synthient and Layer3 all publish per-ASN context pages, so anyone running a network can check their own address space right now.
In Kubernetes we treat egress as policy. On most endpoint fleets it is still a suggestion, and this is what that looks like.