Name:Windows Multiple Account Passwords Changed id:faefb681-14be-4f0d-9cac-0bc0160c7280 version:4 date:2024-09-30 author:Mauricio Velazco, Splunk status:production type:TTP Description:The following analytic detects instances where more than five unique Windows account passwords are changed within a 10-minute interval. It leverages Event Code 4724 from the Windows Security Event Log, using the wineventlog_security dataset to monitor and count distinct TargetUserName values. This behavior is significant as rapid password changes across multiple accounts are unusual and may indicate unauthorized access or internal compromise. If confirmed malicious, this activity could lead to widespread account compromise, unauthorized access to sensitive information, and potential disruption of services. Data_source:
-Windows Event Log Security 4724
search:`wineventlog_security` EventCode=4724 status=success | bucket span=10m _time | stats count dc(user) as unique_users values(user) as user by EventCode signature _time src_user SubjectDomainName TargetDomainName Logon_ID | where unique_users > 5 | `windows_multiple_account_passwords_changed_filter`
how_to_implement:To successfully implement this search, you need to be ingesting Domain Controller events with the Windows TA. The Advanced Security Audit policy setting `Audit User Account Management` within `Account Management` needs to be enabled. known_false_positives:Service accounts may be responsible for the creation, deletion or modification of accounts for legitimate purposes. Filter as needed. References: -https://attack.mitre.org/techniques/T1098/ drilldown_searches: name:'View the detection results for - "$src_user$"' search:'%original_detection_search% | search src_user = "$src_user$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$src_user$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$src_user$") starthoursago=168 | 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:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Azure Active Directory Persistence' asset_type:Endpoint confidence:60 impact:40 message:User $src_user$ changed the passwords of multiple accounts in a short period of time. mitre_attack_id: - 'T1098' - 'T1078' observable: name:'src_user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'EventCode' - 'success' - 'TargetUserName' - 'SubjectUserName' - 'src_user' - 'SubjectDomainName' - 'TargetDomainName' - 'Logon_ID' - 'user' risk_score:24 security_domain:endpoint
