Cyber security firm FireEye recently disclosed an incident that was reported to have resulted in the inadvertent disclosure of various internally developed offensive security tools (OSTs) that were used across FireEye red-team engagements.
Some of these tools appear to be based on well-known offensive frameworks like Cobalt Strike. This is even evident in the naming convention used in the coverage designated by FireEye.
The use of Cobalt Strike beacons is popular among red teams and adversaries. In 2020, Cisco Talos released a research paper detailing the large amount of coverage for the Cobalt Strike framework. We have concluded the coverage is still applicable and can reliably detect FireEye red team beacons and other activity.