https://www.bleepingcomputer.com/news/security/hackers-update-cisco-ios-xe-backdoor-to-hide-infected-devices/

10/23/23 update added at the end explaining the cause of decreased detections.

The number of Cisco IOS XE devices detected with a malicious backdoor implant has plummeted from over 50,000 impacted devices to only a few hundred after the attackers updated the backdoor to hide infected systems from scans.