AWS EC2 AMI Shared with Another Account

Description

Identifies an AWS Amazon Machine Image (AMI) being shared with another AWS account. Adversaries with access may share an AMI with an external AWS account as a means of data exfiltration. AMIs can contain secrets, bash histories, code artifacts, and other sensitive data that adversaries may abuse if shared with unauthorized accounts. AMIs can be made publicly available accidentally as well.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

Detection requirements

Platform: IaaS Office Suite SaaS
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source category: event_index

Known benign triggers

AMI sharing is a common practice in AWS environments. Ensure that the sharing is authorized before taking action. AWS Marketplace subscriptions automatically result in assets.marketplace.amazonaws.com invoking ModifyImageAttribute to share the AMI with your account. This rule excludes Marketplace-invoked sharing by design. Other AWS services like workspaces.amazonaws.com and backup.amazonaws.com may invoke this action when users configure sharing through WorkSpaces or Backup plans. Review such service-invoked events to confirm they match legitimate and intended sharing configurations.

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.html	Product documentation	Only this detection cites it
docs.aws.amazon.com/AWSEC2/latest/UserGuide/sharingamis-explicit.html	Product documentation	Only this detection cites it
stratus-red-team.cloud/attack-techniques/AWS/aws.exfiltration.ec2-share-ami/	Unclassified	2from 2 sources

Detection rules

AWS EC2 AMI Shared with Another Account

Description

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules