Cisco Duo Admin Login Unusual Country

SPLUNK detection rule by Patrick Bareiss, Splunk · Apache-2.0

The following analytic detects instances where a Duo admin login originates from a country outside of the United States, which may indicate suspicious or unauthorized access attempts. Please adjust as needed to your environment. It works by analyzing Duo activity logs for admin login actions and filtering out events where the access device's country is not within the expected region. By correlating user, device, browser, and location details, the analytic highlights anomalies in geographic login patterns. This behavior is critical for a SOC to identify because admin accounts have elevated privileges, and access from unusual countries can be a strong indicator of credential compromise, account takeover, or targeted attacks. Early detection of such activity enables rapid investigation and response, reducing the risk of unauthorized changes, data breaches, or further lateral movement within the environment. The impact of this attack can be severe, potentially allowing attackers to bypass security controls, alter configurations, or exfiltrate sensitive information.

name: Cisco Duo Admin Login Unusual Country
id: 1bf631d1-44a0-472b-98c4-2975b8b281df
version: 6
creation_date: '2025-07-10'
modification_date: '2026-05-13'
author: Patrick Bareiss, Splunk
status: production
type: TTP
description: The following analytic detects instances where a Duo admin login originates from a country outside of the United States, which may indicate suspicious or unauthorized access attempts. Please adjust as needed to your environment. It works by analyzing Duo activity logs for admin login actions and filtering out events where the access device's country is not within the expected region. By correlating user, device, browser, and location details, the analytic highlights anomalies in geographic login patterns. This behavior is critical for a SOC to identify because admin accounts have elevated privileges, and access from unusual countries can be a strong indicator of credential compromise, account takeover, or targeted attacks. Early detection of such activity enables rapid investigation and response, reducing the risk of unauthorized changes, data breaches, or further lateral movement within the environment. The impact of this attack can be severe, potentially allowing attackers to bypass security controls, alter configurations, or exfiltrate sensitive information.
data_source:
    - Cisco Duo Activity
search: |-
    `cisco_duo_activity` "action.name"=admin_login NOT access_device.location.country IN ("United States")
      | rename actor.name as user access_device.ip.address as src_ip
      | stats count min(_time) as firstTime max(_time) as lastTime
        BY access_device.browser access_device.browser_version src_ip
           access_device.location.city access_device.location.country access_device.location.state
           access_device.os access_device.os_version actor.details
           actor.type outcome.result user
      | `security_content_ctime(firstTime)`
      | `security_content_ctime(lastTime)`
      | `cisco_duo_admin_login_unusual_country_filter`
how_to_implement: The analytic leverages Duo activity logs to be ingested using the Cisco Security Cloud App (https://splunkbase.splunk.com/app/7404).
known_false_positives: No false positives have been identified at this time.
references:
    - https://splunkbase.splunk.com/app/7404
drilldown_searches:
    - name: View the detection results for - "$user$"
      search: '%original_detection_search% | search  user = "$user$"'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
    - name: View risk events for the last 7 days for - "$user$"
      search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
      earliest_offset: 7d
      latest_offset: "0"
finding:
    title: A user $user$ has logged in using an unusual country using browser $access_device.browser$ from $src_ip$.
    entity:
        field: user
        type: user
        score: 50
threat_objects:
    - field: access_device.browser
      type: http_user_agent
    - field: src_ip
      type: ip_address
analytic_story:
    - Cisco Duo Suspicious Activity
asset_type: Identity
mitre_attack_id:
    - T1556
product:
    - Splunk Enterprise
    - Splunk Enterprise Security
    - Splunk Cloud
category: application
security_domain: identity
tests:
    - name: True Positive Test
      attack_data:
        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1556/cisco_duo_unusual_admin_login/cisco_duo_activity.json
          source: duo
          sourcetype: cisco:duo:activity
      test_type: unit

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fa2368e4-1627-430e-9412-47507a1857c4

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