This detection analytic identifies more than 10 GetPasswordData API calls made to your AWS account with a time window of 5 minutes. Attackers can retrieve the encrypted administrator password for a running Windows instance.
- Type: Anomaly
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2022-08-10
- Author: Bhavin Patel, Splunk
- ID: 4d347c4a-306e-41db-8d10-b46baf71b3e2
Kill Chain Phase
- CIS 3
- CIS 5
- CIS 16
1 2 3 4 5 `cloudtrail` eventName=GetPasswordData eventSource = ec2.amazonaws.com | bin _time span=5m | stats count values(errorCode) as errorCode dc(requestParameters.instanceId) as distinct_instance_ids values(requestParameters.instanceId) as instance_ids by aws_account_id src_ip user_arn userAgent eventName _time | where distinct_instance_ids > 10 | `aws_credential_access_getpassworddata_filter`
The SPL above uses the following Macros:
aws_credential_access_getpassworddata_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
You must install splunk AWS add on and Splunk App for AWS. This search works with AWS CloudTrail logs. We encourage the users to adjust the values of
distinct_instance_ids and tweak the
span value according to their environment.
Known False Positives
Administrator tooling or automated scripts may make these calls but it is highly unlikely to make several calls in a short period of time.
Associated Analytic Story
|49.0||70||70||User $user_arn$ is seen to make mulitple
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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