AWS Lambda Function Created or Updated

Identifies when an AWS Lambda function is created or updated. AWS Lambda lets you run code without provisioning or managing servers. Adversaries can create or update Lambda functions to execute malicious code, exfiltrate data, or escalate privileges. This is a [building block rule](https://www.elastic.co/guide/en/security/current/building-block-rule.html) that does not generate alerts, but signals when a Lambda function is created or updated that matches the rule’s conditions. To generate alerts, create a rule that uses this signal as a building block.

Rule type: query

Rule indices:

Severity: low

Risk score: 21

Runs every: 10m

Searches indices from: now-60m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Version: 2

Rule authors:

Rule license: Elastic License v2

event.dataset: "aws.cloudtrail"
    and event.provider: "lambda.amazonaws.com"
    and event.outcome: "success"
    and event.action: (CreateFunction* or UpdateFunctionCode*)