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[Tuning] AWS Access Token Used from Multiple Addresses #5055

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Merged
merged 5 commits into from
Sep 11, 2025
Merged

[Tuning] AWS Access Token Used from Multiple Addresses #5055

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[Tuning] AWS Access Token Used from Multiple Addresses
imays11 Sep 2, 2025
41f1f81
Update rules/integrations/aws/initial_access_iam_session_token_used_f…
imays11 Sep 3, 2025
461f5bf
Update rules/integrations/aws/initial_access_iam_session_token_used_f…
imays11 Sep 3, 2025
bf88f88
Merge branch 'main' into tuning_aws_multiple_keys_esql
imays11 Sep 4, 2025
aaace72
Merge branch 'main' into tuning_aws_multiple_keys_esql
imays11 Sep 11, 2025
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45 changes: 38 additions & 7 deletions rules/integrations/aws/initial_access_iam_session_token_used_from_multiple_addresses.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2025/04/11"
integration = ["aws"]
maturity = "production"
updated_date = "2025/07/16"
updated_date = "2025/09/02"

[rule]
author = ["Elastic"]
Expand Down Expand Up @@ -86,16 +86,20 @@ from logs-aws.cloudtrail* metadata _id, _version, _index
and aws.cloudtrail.user_identity.arn is not null
and aws.cloudtrail.user_identity.type == "IAMUser"
and source.ip is not null
and aws.cloudtrail.user_identity.access_key_id is not null
and not (
user_agent.original like "%Terraform%" or
user_agent.original like "%Ansible%" or
user_agent.original like "%Pulumni%"
user_agent.original like "*Terraform*" or
user_agent.original like "*Ansible*" or
user_agent.original like "*Pulumi*"
)
and `source.as.organization.name` != "AMAZON-AES"
and not ((
`source.as.organization.name` == "AMAZON-02" and aws.cloudtrail.event_category == "Data"))
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Just making sure: are these backticks supported in ES|QL pipeline?

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Yes and they used to be necessary for any field with as in the name since that means something in ESQL. We used to get errors when including this field without the backticks but I actually just tried it again without the backticks and am not getting those errors anymore so something might have changed with the language ability to recognize fields like this. I'm going to keep the backticks though as they are still supported.

and event.provider not in (
"health.amazonaws.com", "monitoring.amazonaws.com", "notifications.amazonaws.com",
"ce.amazonaws.com", "cost-optimization-hub.amazonaws.com",
"servicecatalog-appregistry.amazonaws.com", "securityhub.amazonaws.com"
"servicecatalog-appregistry.amazonaws.com", "securityhub.amazonaws.com",
"account.amazonaws.com", "budgets.amazonaws.com", "freetier.amazonaws.com"
)

| eval
Expand All @@ -108,8 +112,9 @@ from logs-aws.cloudtrail* metadata _id, _version, _index
Esql.source_ip_user_agent_pair = concat(Esql.source_ip_string, " - ", user_agent.original),
Esql.source_ip_city_pair = concat(Esql.source_ip_string, " - ", source.geo.city_name),
Esql.source_geo_city_name = source.geo.city_name,
Esql.event_timestamp = @timestamp,
Esql.source_network_org_name = `source.as.organization.name`
Esql.source_network_org_name = `source.as.organization.name`,
Esql.source_ip_network_pair = concat(Esql.source_ip_string, "-", `source.as.organization.name`),
Esql.event_timestamp = @timestamp

| stats
Esql.event_action_values = values(event.action),
Expand All @@ -122,6 +127,7 @@ from logs-aws.cloudtrail* metadata _id, _version, _index
Esql.source_geo_city_name_values = values(Esql.source_geo_city_name),
Esql.source_ip_city_pair_values = values(Esql.source_ip_city_pair),
Esql.source_network_org_name_values = values(Esql.source_network_org_name),
Esql.source_ip_network_pair_values = values(Esql.source_ip_network_pair),
Esql.source_ip_count_distinct = count_distinct(Esql.source_ip),
Esql.user_agent_original_count_distinct = count_distinct(Esql.user_agent_original),
Esql.source_geo_city_name_count_distinct = count_distinct(Esql.source_geo_city_name),
Expand Down Expand Up @@ -165,6 +171,7 @@ from logs-aws.cloudtrail* metadata _id, _version, _index
Esql.source_geo_city_name_values,
Esql.source_ip_city_pair_values,
Esql.source_network_org_name_values,
Esql.source_ip_network_pair_values,
Esql.source_ip_count_distinct,
Esql.user_agent_original_count_distinct,
Esql.source_geo_city_name_count_distinct,
Expand All @@ -173,6 +180,30 @@ from logs-aws.cloudtrail* metadata _id, _version, _index
| where Esql.activity_type != "normal_activity"
'''

[rule.investigation_fields]
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I don't know if we have used dynamic fields in timelines before and what the implications are. With the best practices and guidelines being followed, key:value pairs like Esql.source_ip_values may show up in timelines whereas Esql.activity_fidelity_score is likely unique to this rule. That would only be for alerts too, not raw telemetry and may not be valuable to pivoting and triaging.

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Good point, they seem to be supported in the UI when modifying the rule, but I agree we should double check before merging.

Screenshot 2025-09-04 at 12 04 55 PM

field_names = [
"Esql.timestamp_first_seen",
"Esql.timestamp_last_seen",
"Esql.activity_type",
"Esql.activity_fidelity_score",
"Esql.event_count",
"Esql.aws_cloudtrail_user_identity_arn_values",
"Esql.aws_cloudtrail_user_identity_access_key_id_values",
"Esql.event_action_values",
"Esql.event_provider_values",
"Esql.source_ip_values",
"Esql.user_agent_original_values",
"Esql.source_ip_user_agent_pair_values",
"Esql.source_geo_city_name_values",
"Esql.source_ip_city_pair_values",
"Esql.source_network_org_name_values",
"Esql.source_ip_network_pair_values",
"Esql.source_ip_count_distinct",
"Esql.user_agent_original_count_distinct",
"Esql.source_geo_city_name_count_distinct",
"Esql.source_network_org_name_count_distinct"
]


[[rule.threat]]
framework = "MITRE ATT&CK"
Expand Down
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