Many of the bots I am observing attempt to detect the infected system’s public (“WAN”) IP address. Most of these systems are assumed to be behind NAT. To detect the external IP address, these bots use various public APIs. It may be helpful to detect these requests. Many use unique host names. This will make detecting the request in DNS logs easy even if TLS is not intercepted.
Article Link: https://isc.sans.edu/diary/rss/29516