* [Rule Tuning] AWS Service Quotas Multi-Region GetServiceQuota Requests
This rule is alerting as expected with very few instances in telemetry (only have data from 1 cluster).
- added more fields for context in the query.
- added metadata fields to query
- reduced execution window
- added highlighted fields
#### screenshot of working query with additional context
* Update rules/integrations/aws/discovery_servicequotas_multi_region_service_quota_requests.toml
Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
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Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
This rule is triggering as expected with moderate telemetry volume (high spikes for what looks like expected cleanup jobs) in specific cluster. No changes needed to the rule query.
- updated description, FP and IG
- reduced execution window
- updated highlighted fields
### AWS Config Resource Deletion
- added exclusions for services that perform Config modifications by design, reducing noise by 97% over the last 30 days.
- added success criteria to query as well
- increased severity to medium as this alert should be triaged
- updated description, false positive and investigation guide sections
- reduced execution window
- updated MITRE
- updated tags
- added highlighted fields
### AWS Configuration Recorder Stopped
no major query changes needed for this rule, performing as expected in telemetry with low volume as this is more rare activity.
- updated description, false positive and investigation guide sections
- reduced execution window
- updated MITRE
- updated tags
- added highlighted fields
* [Rule Tunings] AWS Lambda Rules
#### AWS Lambda Layer Added to Existing Function
This rule was missing alerts for the `UpdateFunctionConfiguration` action due to a missing wildcard.
- added missing wildcard to query
- reduced execution window
- updated description, FP and IG sections
- added highlighted fields
#### AWS Lambda Function Policy Updated to Allow Public Invocation
- changed this query to use EQL instead of KQL to optimize wildcard usage
- uses `event.type` as `event_category_override`
- reduced execution window
- updated description, FP and IG sections
- added highlighted fields
* Update rules/integrations/aws/persistence_lambda_backdoor_invoke_function_for_any_principal.toml
Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
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Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
There was a mistake in the query for this rule. It was looking for `event.provider: eventbridge.amazonaws.com` instead of `events.amazonaws.com`. So we have no existing telemetry for this rule. However, I have tested the behavior properly and ensured the new query does alert as expected. I will monitor this rule in telemetry moving forward to gauge it's performance.
- query change `event.provider: events.amazonaws.com`
- reduced execution window
- updated description, FP and IG sections
- updated tags
- added highlighted fields
* [Rule Tuning] AWS CLI with Kali Linux Fingerprint Identified
This rule is performing well in telemetry as expected. I changed this to EQL to avoid the multiple wildcards needed with KQL.
- changed rule type to EQL
- reduced execution window
- updated description, false positive and investigation guide
Script for testing this rule:
Manually perform any action against our AWS account using Kali Linux distribution
#### Screenshot showing working EQL query, still captures the BitPanda behavior this rule was initially designed around.
* add highlighted fields
add highlighted fields
* Update initial_access_kali_user_agent_detected_with_aws_cli.toml
I reduced the history window for new terms rules that were either:
- `now-14 days`
- showing slow performance metrics
There are still several AWS rules with a `now-10d` window but they are not showing any performance issues so I'd like to leave them as is for now.
First Time Seen AWS Secret Value Accessed in Secrets Manager
- removed `BatchGetSecretValue` API call since this calls `GetSecretValue`
- removed the user_agent exclusions from this one, too easy to bypass.
AWS EC2 User Data Retrieval for EC2 Instance
- excluded more benign AWS services from telemetry
AWS IAM Assume Role Policy Update
- removed use of cloudformation exclusion, this should be captured as well
* [Tuning] Top Noisy Windows BBRS
- Process Discovery Using Built-in Tools
- System Service Discovery through built-in Windows Utilities
* Update discovery_generic_process_discovery.toml
* Update discovery_generic_process_discovery.toml
* Update discovery_generic_process_discovery.toml
* Update discovery_generic_process_discovery.toml
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Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
* [Tuning] Elastic Defend and Email Alerts Correlation
this rule uses the logs-* generic index, which causes failures on clusters without an email related integration with `destination.user.name` populated. for now limiting the rule to checkpoint email security and we can add more or users can customize it by adding more indexes.
* add checkpoint_email manifest and schema
* Update pyproject.toml
* Update multiple_alerts_email_elastic_defend_correlation.toml
* [Tuning] Windows BruteForce Rules Tuning
#1 Multiple Logon Failure from the same Source Address: converted to ES|QL and raised the threshold to 100 failed auths, alert quality should be better since it aggregates all failed auths info into one alert vs multiple EQL matches. (expected reduction more than 50%)
#2 Privileged Account Brute Force - coverted to ESQL and set the threshold to 50 in a minute. this should drop noise volume by more than 50%.
* ++
* Update execution_shell_evasion_linux_binary.toml
* Update execution_shell_evasion_linux_binary.toml
* Update defense_evasion_indirect_exec_forfiles.toml
* Update lateral_movement_remote_file_copy_hidden_share.toml
* Update lateral_movement_remote_file_copy_hidden_share.toml
* Update persistence_service_windows_service_winlog.toml
* Update credential_access_lsass_openprocess_api.toml
* Update persistence_suspicious_scheduled_task_runtime.toml
* Update impact_hosts_file_modified.toml
* Update defense_evasion_process_termination_followed_by_deletion.toml
* Update rules/windows/credential_access_lsass_openprocess_api.toml
* Update rules/windows/credential_access_bruteforce_admin_account.toml
Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
* Update rules/windows/credential_access_lsass_openprocess_api.toml
Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
* Update rules/windows/credential_access_bruteforce_multiple_logon_failure_same_srcip.toml
Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
* Update credential_access_lsass_openprocess_api.toml
* Update impact_hosts_file_modified.toml
* Update credential_access_dollar_account_relay.toml
* Update credential_access_new_terms_secretsmanager_getsecretvalue.toml
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Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
This rule is performing well in telemetry and producing alerts as expected for both explicit external account sharing and making snapshots public. Both scenarios tested.
- updated description, FP and IG
- added highlighted fields
- added `event.type` as `event_category_override` field because `event.category` is not populated for these events.
Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
This rule is performing well in telemetry, low volume and expected alerts. No major changes to rule query.
- reduced execution window
- updated description and IG
- added highlighted fields
Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
AWS S3 Bucket Replicated to Another Account
- updated description and IG
- added `event.type` as `event_category_override` field
- adjusted query to use `info` instead of `any` and added `Account=` instead of `Account` to help reduce chances of capturing unintended requests.
- added highlighted fields
AWS S3 Bucket Policy Added to Share with External Account
- added `event.outcome = success` to query to reduce noise from failed attempts
Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
Terrance DeJesus