This search looks for AWS CloudTrail events from AWS Elastic Container Service (ECR). A upload of a new container is normally done during business hours. When done outside business hours, we want to take a look into it.
- Type: Anomaly
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2021-08-19
- Author: Patrick Bareiss, Splunk
- ID: d4c4d4eb-3994-41ca-a25e-a82d64e125bb
Kill Chain Phase
- CIS 13
1 2 3 4 5 6 7 8 9 `cloudtrail` eventSource=ecr.amazonaws.com eventName=PutImage date_hour>=20 OR date_hour<8 OR date_wday=saturday OR date_wday=sunday | rename requestParameters.* as * | rename repositoryName AS image | eval phase="release" | eval severity="medium" | stats min(_time) as firstTime max(_time) as lastTime by awsRegion, eventName, eventSource, user, userName, src_ip, imageTag, registryId, image, phase, severity | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `aws_ecr_container_upload_outside_business_hours_filter`
The SPL above uses the following Macros:
aws_ecr_container_upload_outside_business_hours_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.
Known False Positives
When your development is spreaded in different time zones, applying this rule can be difficult.
Associated Analytic Story
|49.0||70||70||Container uploaded outside business hours from $user$|
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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