Name:Windows Multiple Accounts Disabled id:5d93894e-befa-4429-abde-7fc541020b7b version:4 date:2024-09-30 author:Mauricio Velazco, Splunk status:production type:TTP Description:The following analytic identifies instances where more than five unique Windows accounts are disabled within a 10-minute window, as indicated by Event Code 4725 in the Windows Security Event Log. It leverages the wineventlog_security dataset, grouping data into 10-minute segments and tracking the count and distinct count of TargetUserName. This behavior is significant as it may indicate internal policy breaches or an external attacker's attempt to disrupt operations. If confirmed malicious, this activity could lead to widespread account lockouts, hindering user access and potentially disrupting business operations. Data_source:
-Windows Event Log Security 4725
search:`wineventlog_security` EventCode=4725 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_accounts_disabled_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:30 message:User $src_user$ disabled 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:18 security_domain:endpoint
