Elastic Security Detection Rules

AWS STS GetCallerIdentity API Called for the First Time

Last updated in 2 days on 2024-09-30
Created 4 months ago on 2024-05-24

About

An adversary with access to a set of compromised credentials may attempt to verify that the credentials are valid and determine what account they are using. This rule looks for the first time an identity has called the STS `GetCallerIdentity` API operation in the last 15 days, which may be an indicator of compromised credentials. A legitimate user would not need to call this operation as they should know the account they are using.
Tags
Domain: CloudData Source: AWSData Source: Amazon Web ServicesData Source: AWS STSUse Case: Identity and Access AuditTactic: Discovery
Severity
medium
Risk Score
47
MITRE ATT&CK™

Discovery (TA0007)(opens in a new tab or window)

↳ Account Discovery (T1087)(opens in a new tab or window)

False Positive Examples
Verify whether the user identity should be using the STS `GetCallerIdentity` API operation. If known behavior is causing false positives, it can be exempted from the rule.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
New Terms Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
filebeat-*logs-aws.cloudtrail-*
Related Integrations

aws(opens in a new tab or window)

Query
event.dataset: "aws.cloudtrail" and event.provider: "sts.amazonaws.com" and event.action: "GetCallerIdentity"
and not aws.cloudtrail.user_identity.type: "AssumedRole"

Install detection rules in Elastic Security

Detect AWS STS GetCallerIdentity API Called for the First Time in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).