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LLM Hunting In A MDE Environment

Query

// LLM Hunting in a MDE Environment

let LLM_ModelName =
ExposureGraphNodes
| where NodeLabel == "baseModel"
| project parse_json(NodeProperties)["rawData"]["aiModelMetadata"]["modelName"];
DeviceFileEvents
| where Timestamp > ago (30d)
| where InitiatingProcessVersionInfoFileDescription has_any (LLM_ModelName) 
or InitiatingProcessFolderPath has_any (LLM_ModelName)
or InitiatingProcessFileName has_any (LLM_ModelName)

Explanation

This query is designed to identify events related to specific language models in a Microsoft Defender for Endpoint (MDE) environment over the past 30 days. Here's a simple breakdown:

  1. Identify Language Models:

    • The query first looks at a dataset called ExposureGraphNodes to find nodes labeled as "baseModel".
    • It extracts the model names from these nodes by parsing the JSON data to get the modelName from aiModelMetadata.

  2. Search for Related File Events:

    • It then examines DeviceFileEvents that have occurred in the last 30 days.
    • It filters these events to find any where the description, folder path, or file name of the initiating process matches any of the identified language model names.

In summary, the query is hunting for file events that are associated with specific language models by checking various attributes of the initiating process against the model names found in the environment.

Details

Steven Lim profile picture

Steven Lim

Released: February 11, 2025

Tables

ExposureGraphNodesDeviceFileEvents

Keywords

ExposureGraphNodesDeviceFileEventsTimestampInitiatingProcessVersionInfoFileDescriptionInitiatingProcessFolderPathInitiatingProcessFileName

Operators

let|where==projectparse_json[ ]has_anyor>ago

Actions