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Cloud Compute Instance Created With Previously Unseen Image

Description

This search looks for cloud compute instances being created with previously unseen image IDs.

Content Mapping

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Use Case

Security Monitoring

Category

Cloud Security

Alert Volume

This search looks for cloud compute instances being created with previously unseen image IDs.

SPL Difficulty

None

Journey

Stage 3

Data Sources

Cloud Infrastructure Data

   Help

Cloud Compute Instance Created With Previously Unseen Image Help

You must be ingesting your cloud infrastructure logs from your cloud provider. You should run the baseline search Previously Seen Cloud Compute Images - Initial to build the initial table of images observed and times. You must also enable the second baseline search Previously Seen Cloud Compute Images - Update to keep this table up to date and to age out old data. You can also provide additional filtering for this search by customizing the cloud_compute_instance_created_with_previously_unseen_image_filter macro.

   Search

| tstats count earliest(_time) as firstTime, latest(_time) as lastTime values(All_Changes.object_id) as dest from datamodel=Change where All_Changes.action=created by All_Changes.Instance_Changes.image_id, All_Changes.user | `drop_dm_object_name("All_Changes")` | `drop_dm_object_name("Instance_Changes")` | where image_id != "unknown" | lookup previously_seen_cloud_compute_images image_id as image_id OUTPUT firstTimeSeen, enough_data | eventstats max(enough_data) as enough_data | where enough_data=1 | eval firstTimeSeenImage=min(firstTimeSeen) | where isnull(firstTimeSeenImage) OR firstTimeSeenImage > relative_time(now(), "-24h@h") | table firstTime, user, image_id, count, dest | `security_content_ctime(firstTime)` | `cloud_compute_instance_created_with_previously_unseen_image_filter`
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