* [Rule Tunings] AWS EC2 EBS Snapshot and Encryption Rules
AWS EC2 Encryption Disabled
rule performance is good, telemetry looks low as expected
- additional context to description to emphasize the security concern and purpose of the rule
- updated investigation guide
- added highlighted fields
- reduced execution window
AWS EC2 EBS Snapshot Access Removed
rule alerts as expected, telemetry volume is low as expected. however, this rule can be accomplished using EQL so I've changed the rule type
- changed rule type to eql
- added index
- updated IG
- added highlighted fields
note: I have to use `any` for the query since there is no `event.category` defined for `event.action: ModifySnapshotAttribute`
AWS EC2 EBS Snapshot Shared or Made Public
Converted to EQL. As an ESQL rule the primary benefit was being able to definitely exclude instances where a user adds their own account id when calling the ModifySnapshotAttribute instead of an external account id. This is a redundant action as the snapshot when created is automatically shared with the account it's created in. But this could be a false positive if it's done by mistake. Instead of keeping this as an ESQL rule, I still think there is more value to converting this to EQL for both customer alert context and telemetry. When looking at production data, I saw no instances where the owning account id was added in this way. Its a rare mistake that shouldn't happen often enough to support keeping this as an ESQL rule.
- converted to EQL
- added index
- updated IG
- updated description
- added highlighted fields
* adding event_category_override = "event.provider"
override event.category to event.provider to account for the use of "any" in EQL query
* normalizing IG title capitalization
normalizing IG title capitalization
* bumping severity to medium
since EC2 snapshot data can be sensitive, unauthorized sharing or access removal should be triaged
* updated event_category_override field
replaced event.provider with event.type to satisfy EQL library parsing requirements
Isai
28f227ab6f