Files
sigma-rules/rules
Samirbous b39cfc34e6 [New] First Time Seen Elastic Defend Behavior Alert (#5528)
* [New] First Time Seen Elastic Defend Behavior Alert

This rule detects Elastic Defend behavior alerts that are observed for the first time today when compared against
the previous 7 days of alert history. It highlights low-volume, newly observed alerts tied to a specific detection rule on a single agent, which may indicate early-stage malicious activity or initial execution of suspicious behavior :

* Update first_time_seen_elastic_defend_alert.toml

* ++

* Update first_time_seen_elastic_defend_alert.toml

* ++

* Update fist_time_seen_elastic_detection_rule.toml

* Update fist_time_seen_elastic_detection_rule.toml

* Update rules/cross-platform/first_time_seen_elastic_defend_alert.toml

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

* Update rules/cross-platform/fist_time_seen_elastic_detection_rule.toml

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

* Update rules/cross-platform/fist_time_seen_elastic_detection_rule.toml

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

* Update fist_time_seen_elastic_detection_rule.toml

* Update first_time_seen_elastic_defend_alert.toml

* Update rules/cross-platform/first_time_seen_elastic_defend_alert.toml

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

* Update rules/cross-platform/first_time_seen_elastic_defend_alert.toml

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

* Update rules/cross-platform/fist_time_seen_elastic_detection_rule.toml

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

* Update first_time_seen_elastic_defend_alert.toml

* Update and rename fist_time_seen_elastic_detection_rule.toml to newly_observed_elastic_detection_rule.toml

* Rename first_time_seen_elastic_defend_alert.toml to newly_observed_elastic_defend_alert.toml

* Update newly_observed_elastic_defend_alert.toml

* Update newly_observed_elastic_detection_rule.toml

* Update newly_observed_elastic_defend_alert.toml

* Update newly_observed_elastic_detection_rule.toml

* Update newly_observed_elastic_defend_alert.toml

* Update newly_observed_elastic_detection_rule.toml

* Update newly_observed_elastic_detection_rule.toml

---------

Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
2026-01-09 10:34:32 +00:00
..

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