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MediumMicrosoft Sentinel analytics

Beacon Traffic Based on Common User Agents Visiting Limited Number of Domains

This query searches web proxy logs for a specific type of beaconing behavior by joining a number of sources together: - Traffic by actual web browsers - by looking at traffic generated by a UserAgent that looks like…

Description

This query searches web proxy logs for a specific type of beaconing behavior by joining a number of sources together: - Traffic by actual web browsers - by looking at traffic generated by a UserAgent that looks like a browser and is used by multiple users to visit a large number of domains. - Users that make requests using one of these actual browsers, but only to a small set of domains, none of which are common domains. - The traffic is beacon-like; meaning that it occurs during many different hours of the day (i.e. periodic).

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source product
zscaler
Log source service
commonsecuritylog

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