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Description

This search looks for AWS CloudTrail events from AWS Elastic Container Service (ECR). You need to activate image scanning in order to get the event DescribeImageScanFindings with the results.

  • Type: Anomaly
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2021-08-17
  • Author: Patrick Bareiss, Splunk
  • ID: 0b80e2c8-c746-4ddb-89eb-9efd892220cf

Annotations

ATT&CK
ID Technique Tactic
T1204.003 Malicious Image Execution
T1204 User Execution Execution
Kill Chain Phase
  • Actions on Objectives
NIST
  • PR.DS
  • PR.AC
  • DE.CM
CIS20
  • CIS 13
CVE
1
2
3
4
5
6
7
8
9
10
11
12
13
`cloudtrail` eventSource=ecr.amazonaws.com eventName=DescribeImageScanFindings 
| spath path=responseElements.imageScanFindings.findings{} output=findings 
| mvexpand findings 
| spath input=findings
| search severity=MEDIUM 
| rename name as finding_name, description as finding_description, requestParameters.imageId.imageDigest as imageDigest, requestParameters.repositoryName as image 
| eval finding = finding_name.", ".finding_description 
| eval phase="release" 
| eval severity="medium" 
| stats min(_time) as firstTime max(_time) as lastTime by awsRegion, eventName, eventSource, imageDigest, image, user, userName, src_ip, finding, phase, severity 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `aws_ecr_container_scanning_findings_medium_filter`

Macros

The SPL above uses the following Macros:

Note that aws_ecr_container_scanning_findings_medium_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • eventSource
  • eventName
  • responseElements.imageScanFindings.findings{}
  • awsRegion
  • requestParameters.imageId.imageDigest
  • requestParameters.repositoryName
  • user
  • userName
  • src_ip

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

unknown

Associated Analytic story

RBA

Risk Score Impact Confidence Message
21.0 30 70 Vulnerabilities with severity high found in image $image$

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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