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Isai 74d1715f6e [Rule Tuning] AWS EC2 User Data Retrieval for EC2 Instance (#4808)
* [Rule Tuning] AWS EC2 User Data Retrieval for EC2 Instance

- changed execution window
- explicitly added flattened fields to query, to reduce wildcard usage
- added investigation fields
- changed new terms field to evaluate `user.name` over `aws.cloudtrail.user_identity.arn` so that only the role name for Assumed Role identitites is being evaluated instead of each individual session. This should greatly impact performance as most instances of this rule in telemetry is triggered by Assumed Roles.

* Apply suggestions from code review

* remove instanceId parameter

Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>

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Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
2025-06-17 14:51:18 -04:00
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2025-03-26 11:04:14 -04:00

rules/

Rules within this folder are organized by solution or platform. The structure is flattened out, because nested file hierarchies are hard to navigate and find what you're looking for. Each directory contains several .toml files, and the primary ATT&CK tactic is included in the file name when it's relevant (i.e. windows/execution_via_compiled_html_file.toml)

folder description
. Root directory where rules are stored
apm/ Rules that use Application Performance Monitoring (APM) data sources
cross-platform/ Rules that apply to multiple platforms, such as Windows and Linux
integrations/ Rules organized by Fleet integration
linux/ Rules for Linux or other Unix based operating systems
macos/ Rules for macOS
ml/ Rules that use machine learning jobs (ML)
network/ Rules that use network data sources
promotions/ Rules that promote external alerts into detection engine alerts
windows/ Rules for the Microsoft Windows Operating System

Integration specific rules are stored in the integrations/ directory:

folder integration
aws/ Amazon Web Services (AWS)
azure/ Microsoft Azure
cyberarkpas/ Cyber Ark Privileged Access Security
endpoint/ Elastic Endpoint Security
gcp/ Google Cloud Platform (GCP)
google_workspace/ Google Workspace (formerly GSuite)
o365/ Microsoft Office
okta/ Oka