AT GROUND LEVEL
Out of an abundance of caution , the impacted version of the channel file was added to Falcon ’ s known-bad list in the CrowdStrike Cloud . the window , were not impacted . CrowdStrike delivers security content configuration updates to our sensors in two ways . Sensor Content that is shipped with CrowdStrike sensor directly , and Rapid Response Content that is designed to respond to the changing threat landscape at operational speed .
Why it happened ?
The issue on Friday involved a Rapid Response Content update with an undetected error .
Rapid Response Content is used to perform a variety of behavioural pattern-matching operations on the sensor using a highly optimised engine . Rapid Response Content is a representation of fields and values , with associated filtering . This Rapid Response Content is stored in a proprietary binary file that contains configuration data . It is not code or a kernel driver .
Rapid Response Content is delivered as Template Instances , which are instantiations of a given Template Type . Each Template Instance maps to specific behaviours for the sensor to observe , detect or prevent . Template Instances have a set of fields that can be configured to match the desired behaviour .
In other words , Template Types represent a sensor capability that enables new telemetry and detection , and their runtime behaviour is configured dynamically by the Template Instance that is Rapid Response Content .
Rapid Response Content provides visibility and detections on the sensor without requiring sensor code changes . Threat detection engineers use this capability to gather telemetry , identify indicators of adversary behaviour and perform detections and preventions .
Rapid Response Content is behavioural heuristics , separate and distinct from CrowdStrike ’ s on-sensor AI prevention and detection capabilities . Rapid Response Content is delivered as content configuration updates to the Falcon sensor .
How it happened ?
On July 19 , 2024 , two additional IPC Template Instances were deployed . Due to a bug in the Content Validator , one of the two Template
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