Classification:

attack

Tactic:

TA0007-discovery

Technique:

T1526-cloud-service-discovery

VIEW RULE IN DATADOG VIEW SIGNALS

Goal

Detect when the Amazon Simple Notification Service (SNS) is enumerated by a previously unseen user.

Strategy

Monitor CloudTrail and detect when the Amazon SNS has been enumerated with one of the following API calls:

• GetSMSAttributes
• GetSMSSandboxAccountStatus
• ListOriginationNumbers
• ListTopics
• ListSubscriptions

Triage and response

1. Determine if the API call: {{@evt.name}} should have been made by the user: {{@userIdentity.arn}} from this IP address : {{@network.client.ip}} .
2. If the action is legitimate, consider including the user in a suppression list. See Best practices for creating detection rules with Datadog Cloud SIEM for more information.
3. If the action shouldn’t have happened:
   • Contact the user: {{@userIdentity.arn}} and see if they made the API call.
   • Use the Cloud SIEM - User Investigation dashboard to see if the user {{@userIdentity.arn}} has taken other actions.
   • Use the Cloud SIEM - IP Investigation dashboard to see if there’s more traffic from the IP {{@network.client.ip}}.
4. If the results of the triage indicate that an attacker has taken the action, begin your company’s incident response process as well as an investigation.