Sigma rule: AWS Bedrock Guardrail Updated

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-01c85bca0ead, updated 2026-07-10T00:00:00.000Z.

Rule

Title: AWS Bedrock Guardrail Updated
Status: experimental
Level: medium
Author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber)
Date: 2026-07-10
File: rules/cloud/aws/cloudtrail/aws_cloudtrail_bedrock_guardrail_updated.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects updates to an Amazon Bedrock guardrail, which may indicate attempts to weaken
model safety controls and allow unsafe or unauthorized model responses.

Log source

product: aws
service: cloudtrail

Detection

selection:
    eventName: 'UpdateGuardrail'
    eventSource: 'bedrock.amazonaws.com'
condition: selection

False positives (as the rule lists them)

Legitimate guardrail updates by authorized identities.

MITRE ATT&CK ids this rule names

T1685

References

https://docs.aws.amazon.com/bedrock/latest/APIReference/API_UpdateGuardrail.html

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_cloudtrail_bedrock_guardrail_updated.yml

Sources and licences

SigmaHQ
"AWS Bedrock Guardrail Updated" by Marco Pedrinazzi (@pedrinazziM) (InTheCyber) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_cloudtrail_bedrock_guardrail_updated.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: AWS Bedrock Guardrail Updated",
entity page, dataset version ref-01c85bca0ead, updated 2026-07-10T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/1c722651-254a-4b04-a9f4-99b62a2d0a1f (accessed 2026-11-03).
Underlying source: SigmaHQ rule 1c722651-254a-4b04-a9f4-99b62a2d0a1f, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.