Analytics Story: Command And Control

Description

Detect and investigate tactics, techniques, and procedures leveraged by attackers to establish and operate Command And Control channels. Implants installed by attackers on compromised endpoints use these channels to receive instructions and send data back to the malicious operators.

Why it matters

Threat actors typically architect and implement an infrastructure to use in various ways during the course of their attack campaigns. In some cases, they leverage this infrastructure for scanning and performing reconnaissance activities. In others, they may use this infrastructure to launch actual attacks. One of the most important functions of this infrastructure is to establish servers that will communicate with implants on compromised endpoints. These servers establish a command and control channel that is used to proxy data between the compromised endpoint and the attacker. These channels relay commands from the attacker to the compromised endpoint and the output of those commands back to the attacker. Because this communication is so critical for an adversary, they often use techniques designed to hide the true nature of the communications. There are many different techniques used to establish and communicate over these channels. This Analytic Story provides searches that look for a variety of the techniques used for these channels, as well as indications that these channels are active, by examining logs associated with border control devices and network-access control lists.

Detections

Data Sources

Name ▲▼	Platform ▲▼	Sourcetype ▲▼	Source ▲▼
Cisco Secure Firewall Threat Defense Connection Event	Other	cisco:sfw:estreamer	not_applicable
Splunk Stream HTTP	Splunk	stream:http	stream:http
CrowdStrike ProcessRollup2	Other	crowdstrike:events:sensor	crowdstrike
Sysmon EventID 1	Windows	XmlWinEventLog	XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Windows Event Log Security 4688	Windows	XmlWinEventLog	XmlWinEventLog:Security
Palo Alto Network Traffic	Network	pan:traffic	not_applicable
Sysmon EventID 18	Windows	XmlWinEventLog	XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Sysmon EventID 17	Windows	XmlWinEventLog	XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Sysmon EventID 22	Windows	XmlWinEventLog	XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Palo Alto Network Threat	Network	pan:threat	not_applicable
Sysmon EventID 13	Windows	XmlWinEventLog	XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Cisco Secure Access Firewall	Other	cisco:cloud_security:firewall	cisco_secure_access:firewall
Sysmon EventID 11	Windows	XmlWinEventLog	XmlWinEventLog:Microsoft-Windows-Sysmon/Operational

References

• https://searchsecurity.techtarget.com/feature/Command-and-control-servers-The-puppet-masters-that-govern-malware
• https://attack.mitre.org/wiki/Command_and_Control

Source: GitHub | Version: 2