Sample rules
AWS STS Role Assumption by Service
- source: elastic
- technicques:
- T1548
- T1550
Description
Identifies when a service has assumed a role in AWS Security Token Service (STS). Services can assume a role to obtain temporary credentials and access AWS resources. Adversaries can use this technique for credential access and privilege escalation. This is a New Terms rule that identifies when a service assumes a role in AWS Security Token Service (STS) to obtain temporary credentials and access AWS resources. While often legitimate, adversaries may use this technique for unauthorized access, privilege escalation, or lateral movement within an AWS environment.
Detection logic
event.dataset: "aws.cloudtrail"
and event.provider: "sts.amazonaws.com"
and event.action: "AssumeRole"
and event.outcome: "success"
and aws.cloudtrail.user_identity.type: "AWSService"
and not aws.cloudtrail.user_identity.invoked_by: (
"config.amazonaws.com" or
"securityhub.amazonaws.com" or
"sso.amazonaws.com"
)
AWS STS Role Assumption by User
- source: elastic
- technicques:
- T1548
- T1550
Description
Identifies when a user or role has assumed a role in AWS Security Token Service (STS). Users can assume a role to obtain temporary credentials and access AWS resources. Adversaries can use this technique for credential access and privilege escalation. This is a New Terms rule that identifies when a service assumes a role in AWS Security Token Service (STS) to obtain temporary credentials and access AWS resources. While often legitimate, adversaries may use this technique for unauthorized access, privilege escalation, or lateral movement within an AWS environment.
Detection logic
event.dataset: "aws.cloudtrail"
and event.provider: "sts.amazonaws.com"
and event.action: "AssumeRole"
and event.outcome: "success"
and aws.cloudtrail.user_identity.type: ("AssumedRole" or "IAMUser")
AWS STS AssumeRole with New MFA Device
- source: elastic
- technicques:
- T1548
- T1550
- T1556
Description
Identifies when a user has assumed a role using a new MFA device. Users can assume a role to obtain temporary credentials and access AWS resources using the AssumeRole API of AWS Security Token Service (STS). While a new MFA device is not always indicative of malicious behavior it should be verified as adversaries can use this technique for persistence and privilege escalation.
Detection logic
event.dataset:aws.cloudtrail
and event.provider:sts.amazonaws.com
and event.action:(AssumeRole or AssumeRoleWithSAML or AssumeRoleWithWebIdentity)
and event.outcome:success
and user.id:*
and aws.cloudtrail.flattened.request_parameters.serialNumber:*