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@@ -56,10 +56,10 @@ tags:
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- src_ip
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risk_score: 54
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security_domain: threat
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manual_test: This search needs a specific number of events in a time window for the alert to trigger and events split up in CI testing while updating timestamp.
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1110.003/aws_mulitple_failed_console_login/aws_cloudtrail.json
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source: aws_cloudtrail
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sourcetype: aws:cloudtrail
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update_timestamp: true
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@@ -77,6 +77,7 @@ tags:
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- All_Changes.command
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risk_score: 18
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security_domain: threat
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manual_test: This search needs the baseline to be run first to create a lookup
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tests:
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- name: True Positive Test
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attack_data:
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@@ -77,6 +77,7 @@ tags:
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- All_Changes.command
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risk_score: 42
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security_domain: threat
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manual_test: This search needs the baseline to be run first to create a lookup
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tests:
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- name: True Positive Test
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attack_data:
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@@ -76,6 +76,7 @@ tags:
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- All_Changes.command
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risk_score: 42
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security_domain: threat
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manual_test: This search needs the baseline to be run first to create a lookup
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tests:
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- name: True Positive Test
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attack_data:
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@@ -77,6 +77,7 @@ tags:
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- All_Changes.command
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risk_score: 42
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security_domain: threat
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manual_test: This search needs the baseline to be run first to create a lookup
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tests:
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- name: True Positive Test
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attack_data:
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@@ -41,9 +41,10 @@ tags:
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- SubcategoryGuid
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risk_score: 60
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security_domain: endpoint
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manual_test: This search uses a lookup provided by Enterprise Security and needs to be manually tested
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/disable_gpo/windows-security-xml.log
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source: XmlWinEventLog:Security
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sourcetype: xmlwineventlog
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sourcetype: xmlwineventlog
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@@ -4,7 +4,7 @@ version: 1
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date: "2022-11-18"
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author: Dean Luxton
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type: TTP
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status: production
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status: experimental
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data_source: []
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description:
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This analytic detects the addition of the permissions necessary to perform a DCSync attack.
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@@ -13,7 +13,7 @@ description:
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- DS-Replication-Get-Changes-All
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Certain Sync operations may require the additional permission of DS-Replication-Get-Changes-In-Filtered-Set.
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By default, adding DCSync permissions via the Powerview Add-ObjectACL operation adds all 3. This alert identifies where this trifecta has been met, and also where just the base level requirements have been met.
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search: '`wineventlog_security` | rex field=AttributeValue max_match=10000 \"OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;(?P<DSRGetChangesFiltered_user_sid>S-1-[0-59]-\d{2}-\d{8,10}-\d{8,10}-\d{8,10}-[1-9]\d{3})\)\"| table _time dest src_user DSRGetChanges_user_sid DSRGetChangesAll_user_sid DSRGetChangesFiltered_user_sid| mvexpand DSRGetChanges_user_sid| eval minDCSyncPermissions=if(DSRGetChanges_user_sid=DSRGetChangesAll_user_sid,\"true\",\"false\"), fullSet=if(DSRGetChanges_user_sid=DSRGetChangesAll_user_sid AND DSRGetChanges_user_sid=DSRGetChangesFiltered_user_sid,\"true\",\"false\")| where minDCSyncPermissions=\"true\" | lookup identity_lookup_expanded objectSid as DSRGetChanges_user_sid OUTPUT sAMAccountName as user | rename DSRGetChanges_user_sid as userSid | stats min(_time) as _time values(user) as user by dest src_user userSid minDCSyncPermissions fullSet| `windows_ad_domain_replication_acl_addition_filter`'
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search: '`wineventlog_security` | rex field=AttributeValue max_match=10000 \"OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;(?P<DSRGetChangesFiltered_user_sid>S-1-[0-59]-\d{2}-\d{8,10}-\d{8,10}-\d{8,10}-[1-9]\d{3})\)\"| table _time dest src_user DSRGetChanges_user_sid DSRGetChangesAll_user_sid DSRGetChangesFiltered_user_sid| mvexpand DSRGetChanges_user_sid| eval minDCSyncPermissions=if(DSRGetChanges_user_sid=DSRGetChangesAll_user_sid,\"true\",\"false\"), fullSet=if(DSRGetChanges_user_sid=DSRGetChangesAll_user_sid AND DSRGetChanges_user_sid=DSRGetChangesFiltered_user_sid,\"true\",\"false\")| where minDCSyncPermissions=\"true\" | lookup identity_lookup_expanded objectSid as DSRGetChanges_user_sid OUTPUT sAMAccountName as user | rename DSRGetChanges_user_sid as userSid | stats min(_time) as _time values(user) as user by dest src_user userSid minDCSyncPermissions fullSet| `windows_ad_domain_replication_acl_addition_filter`'
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how_to_implement:
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To successfully implement this search, you need to be ingesting the eventcode 5136. The Advanced Security Audit policy setting
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`Audit Directory Services Changes` within `DS Access` needs to be enabled, alongside a SACL for `everybody` to `Write All Properties`
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@@ -61,6 +61,7 @@ tags:
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- ObjectClass
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risk_score: 80
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security_domain: endpoint
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manual_test: This search uses a lookup provided by Enterprise Security and needs to be manually tested.
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tests:
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- name: True Positive Test
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attack_data:
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@@ -66,6 +66,7 @@ tags:
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- Logon_ID
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risk_score: 90
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security_domain: endpoint
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manual_test: This search uses a lookup provided by Enterprise Security and needs to be manually tested.
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tests:
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- name: True Positive Test
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attack_data:
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