Detectionmediumtest

AWS Suspicious SAML Activity

Identifies when suspicious SAML activity has occurred in AWS. An adversary could gain backdoor access via SAML.

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Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

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Austin SongerCreated Wed Sep 22Updated Sun Dec 18f43f5d2f-3f2a-4cc8-b1af-81fde7dbaf0ecloud

Log Source

AWScloudtrail

ProductAWS← raw: aws

Servicecloudtrail← raw: cloudtrail

Detection Logic

detection:
    selection_sts:
        eventSource: 'sts.amazonaws.com'
        eventName: 'AssumeRoleWithSAML'
    selection_iam:
        eventSource: 'iam.amazonaws.com'
        eventName: 'UpdateSAMLProvider'
    condition: 1 of selection_*

False Positives

Automated processes that uses Terraform may lead to false positives.

SAML Provider could be updated by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.

SAML Provider being updated from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

References

MITRE ATT&CK

Tactics

TA0005 · Defense Evasion TA0001 · Initial Access TA0008 · Lateral Movement TA0003 · Persistence TA0004 · Privilege Escalation

Techniques

T1078 · Valid Accounts T1548 · Abuse Elevation Control Mechanism T1550 · Use Alternate Authentication Material

Sub-techniques

T1550.001 · Application Access Token

Rule Metadata

Rule ID

f43f5d2f-3f2a-4cc8-b1af-81fde7dbaf0e

Status

test

Level

medium

Type

Detection

Created

Wed Sep 22

Modified

Sun Dec 18

Author

Austin Songer

Path

rules/cloud/aws/cloudtrail/aws_susp_saml_activity.yml

Raw Tags

attack.defense-evasionattack.initial-accessattack.lateral-movementattack.persistenceattack.privilege-escalationattack.t1078attack.t1548attack.t1550attack.t1550.001

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