Exclude Malwarescore + Ransomware EP alerts from DRule telemetry.

[pjhampton]

Summary

This opens up endpoint alerts, but excludes Malwarescore and Ransomware alerts that we collect through event telemetry. This is so we can get information on endpoint promotion rules. Issue Backported.

Checklist

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Risk Matrix

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Before closing this PR, invite QA, stakeholders, and other developers to identify risks that should be tested prior to the change/feature release.

When forming the risk matrix, consider some of the following examples and how they may potentially impact the change:

Risk	Probability	Severity	Mitigation/Notes
Multiple Spaces—unexpected behavior in non-default Kibana Space.	Low	High	Integration tests will verify that all features are still supported in non-default Kibana Space and when user switches between spaces.
Multiple nodes—Elasticsearch polling might have race conditions when multiple Kibana nodes are polling for the same tasks.	High	Low	Tasks are idempotent, so executing them multiple times will not result in logical error, but will degrade performance. To test for this case we add plenty of unit tests around this logic and document manual testing procedure.
Code should gracefully handle cases when feature X or plugin Y are disabled.	Medium	High	Unit tests will verify that any feature flag or plugin combination still results in our service operational.
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For maintainers

• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[pjhampton]

Testing in progress.

[kibana-ci]

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Metrics [docs]

✅ unchanged

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@elasticmachine merge upstream

cc @pjhampton

[pjhampton]

Manual alert testing lgtm. Happy for this to release in next BC.

[donaherc]

LGTM, we now exclude:

1. Malware Detection/Prevention alerts
2. Ransomeware Detection/Prevention alerts

This is less restrictive than the previous implementation, which I think is the right call. AFAICT, (1) and (2) above are already sent up in endpoint alerts anyways?

[pjhampton]

This is less restrictive than the previous implementation, which I think is the right call. AFAICT, (1) and (2) above are already sent up in endpoint alerts anyways?

Yep!

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.2

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

[donaherc]

Related to
https://github.com/elastic/security-team/issues/1164