splunk-security_content/docs/_stories/cloud_federated_credential_abuse.md

title, last_modified_at, toc, tags

title	last_modified_at	toc	tags
Cloud Federated Credential Abuse	2021-01-26	true	Splunk Security Analytics for AWS Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This analytical story addresses events that indicate abuse of cloud federated credentials. These credentials are usually extracted from endpoint desktop or servers specially those servers that provide federation services such as Windows Active Directory Federation Services. Identity Federation relies on objects such as Oauth2 tokens, cookies or SAML assertions in order to provide seamless access between cloud and perimeter environments. If these objects are either hijacked or forged then attackers will be able to pivot into victim's cloud environements.

• Product: Splunk Security Analytics for AWS, Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-01-26
• Author: Rod Soto, Splunk
• ID: cecdc1e7-0af2-4a55-8967-b9ea62c0317d

Narrative

This story is composed of detection searches based on endpoint that addresses the use of Mimikatz, Escalation of Privileges and Abnormal processes that may indicate the extraction of Federated directory objects such as passwords, Oauth2 tokens, certificates and keys. Cloud environment (AWS, Azure) related events are also addressed in specific cloud environment detection searches.

Detections

Name	Technique	Type
AWS SAML Access by Provider User and Principal	Valid Accounts, LSASS Memory, Cloud Account, Modify Authentication Process, Image File Execution Options Injection	Anomaly
AWS SAML Update identity provider	Valid Accounts	TTP
Certutil exe certificate extraction		TTP
Detect Mimikatz Using Loaded Images	LSASS Memory	TTP
Detect Rare Executables		Anomaly
O365 Add App Role Assignment Grant User	Cloud Account	TTP
O365 Added Service Principal	Cloud Account	TTP
O365 Excessive SSO logon errors	Modify Authentication Process	Anomaly
O365 New Federated Domain Added	Cloud Account	TTP
Registry Keys Used For Privilege Escalation	Image File Execution Options Injection	TTP

Reference

• https://www.cyberark.com/resources/threat-research-blog/golden-saml-newly-discovered-attack-technique-forges-authentication-to-cloud-apps
• https://www.fireeye.com/content/dam/fireeye-www/blog/pdfs/wp-m-unc2452-2021-000343-01.pdf
• https://us-cert.cisa.gov/ncas/alerts/aa21-008a

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