Adding Azure EntraID rules #1463
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| Original file line number | Diff line number | Diff line change |
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| from panther_msft_helpers import azure_rule_context, azure_success | ||
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| def rule(event): | ||
| if not azure_success(event) or event.get("operationName") != "Invite external user": | ||
| return False | ||
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| user_who_sent_invite = event.deep_get( | ||
| "properties", "initiatedBy", "user", "userPrincipalName", default="" | ||
| ) | ||
| user_who_received_invite = event.deep_walk( | ||
| "properties", "additionalDetails", "value", return_val="last", default="" | ||
| ) | ||
| domain = user_who_sent_invite.split("@")[-1] | ||
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| different_domain = not user_who_received_invite.endswith(domain) | ||
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| return different_domain | ||
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| def title(event): | ||
| user_who_sent_invite = event.deep_get( | ||
| "properties", "initiatedBy", "user", "userPrincipalName", default="" | ||
| ) | ||
| user_who_received_invite = event.deep_walk( | ||
| "properties", "additionalDetails", "value", return_val="last", default="" | ||
| ) | ||
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| return ( | ||
| f"{user_who_sent_invite} invited {user_who_received_invite} to join as an EntraID member." | ||
| ) | ||
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| def alert_context(event): | ||
| return azure_rule_context(event) |
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| Original file line number | Diff line number | Diff line change | ||||
|---|---|---|---|---|---|---|
| @@ -0,0 +1,294 @@ | ||||||
| AnalysisType: rule | ||||||
| Filename: azure_invite_external_users.py | ||||||
| RuleID: "Azure.Audit.InviteExternalUsers" | ||||||
| DisplayName: "Azure Invite External Users" | ||||||
| Enabled: true | ||||||
| LogTypes: | ||||||
| - Azure.Audit | ||||||
| Severity: Low | ||||||
| Description: > | ||||||
| This detection looks for a Azure users inviting external users | ||||||
| Reports: | ||||||
| MITRE ATT&CK: | ||||||
| - TA0001:T1078 | ||||||
| Runbook: > | ||||||
| Verify the user permissions and investigate the external user details. If unauthorized, revoke access and block further invites. Update security policies. | ||||||
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| Reference: https://learn.microsoft.com/en-us/entra/identity/authentication/overview-authentication | ||||||
| SummaryAttributes: | ||||||
| - properties:ServicePrincipalName | ||||||
| - properties:UserPrincipalName | ||||||
|
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| - properties:ipAddress | ||||||
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| Tests: | ||||||
| - Name: Successful Invite external user | ||||||
| ExpectedResult: true | ||||||
| Log: | ||||||
| { | ||||||
| "callerIpAddress": "1.1.1.1", | ||||||
| "category": "AuditLogs", | ||||||
| "correlationId": "123456789", | ||||||
| "durationMs": 0, | ||||||
| "Level": 4, | ||||||
| "operationName": "Invite external user", | ||||||
| "operationVersion": "1.0", | ||||||
| "properties": { | ||||||
| "activityDateTime": "2024-09-23 14:33:09.049661100", | ||||||
| "activityDisplayName": "Invite external user", | ||||||
| "additionalDetails": [ | ||||||
| { | ||||||
| "key": "oid", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "tid", | ||||||
| "value": "0123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "ipaddr", | ||||||
| "value": "1.2.3.4" | ||||||
| }, | ||||||
| { | ||||||
| "key": "wids", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "InvitationId", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "invitedUserEmailAddress", | ||||||
| "value": "[email protected]" | ||||||
| } | ||||||
| ], | ||||||
| "category": "UserManagement", | ||||||
| "correlationId": "123456789", | ||||||
| "id": "Invited Users_123456789", | ||||||
| "initiatedBy": { | ||||||
| "user": { | ||||||
| "id": "123456789", | ||||||
| "ipAddress": "1.2.3.4.5", | ||||||
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| "roles": [], | ||||||
| "userPrincipalName": "[email protected]" | ||||||
| } | ||||||
| }, | ||||||
| "loggedByService": "Invited Users", | ||||||
| "operationType": "Add", | ||||||
| "result": "success", | ||||||
| "targetResources": [ | ||||||
| { | ||||||
| "administrativeUnits": [], | ||||||
| "displayName": "Zeus.Theboss", | ||||||
| "id": "123456789", | ||||||
| "type": "User" | ||||||
| } | ||||||
| ] | ||||||
| }, | ||||||
| "resourceId": "/tenants/123456789/providers/Microsoft.aadiam", | ||||||
| "resultSignature": "None", | ||||||
| "tenantId": "123456789", | ||||||
| "time": "2024-12-10 14:33:09.049661100" | ||||||
| } | ||||||
| - Name: Same org successful invite | ||||||
| ExpectedResult: false | ||||||
| Log: | ||||||
| { | ||||||
| "callerIpAddress": "1.1.1.1", | ||||||
| "category": "AuditLogs", | ||||||
| "correlationId": "123456789", | ||||||
| "durationMs": 0, | ||||||
| "Level": 4, | ||||||
| "operationName": "Invite external user", | ||||||
| "operationVersion": "1.0", | ||||||
| "properties": { | ||||||
| "activityDateTime": "2024-09-23 14:33:09.049661100", | ||||||
| "activityDisplayName": "Invite external user", | ||||||
| "additionalDetails": [ | ||||||
| { | ||||||
| "key": "oid", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "tid", | ||||||
| "value": "0123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "ipaddr", | ||||||
| "value": "1.2.3.4" | ||||||
| }, | ||||||
| { | ||||||
| "key": "wids", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "InvitationId", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "invitedUserEmailAddress", | ||||||
| "value": "[email protected]" | ||||||
| } | ||||||
| ], | ||||||
| "category": "UserManagement", | ||||||
| "correlationId": "123456789", | ||||||
| "id": "Invited Users_123456789", | ||||||
| "initiatedBy": { | ||||||
| "user": { | ||||||
| "id": "123456789", | ||||||
| "ipAddress": "1.2.3.4.5", | ||||||
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| "roles": [], | ||||||
| "userPrincipalName": "[email protected]" | ||||||
| } | ||||||
| }, | ||||||
| "loggedByService": "Invited Users", | ||||||
| "operationType": "Add", | ||||||
| "result": "success", | ||||||
| "targetResources": [ | ||||||
| { | ||||||
| "administrativeUnits": [], | ||||||
| "displayName": "Zeus.Theboss", | ||||||
| "id": "123456789", | ||||||
| "type": "User" | ||||||
| } | ||||||
| ] | ||||||
| }, | ||||||
| "resourceId": "/tenants/123456789/providers/Microsoft.aadiam", | ||||||
| "resultSignature": "None", | ||||||
| "tenantId": "123456789", | ||||||
| "time": "2024-12-10 14:33:09.049661100" | ||||||
| } | ||||||
| - Name: Unsuccessful invite | ||||||
| ExpectedResult: false | ||||||
| Log: | ||||||
| { | ||||||
| "callerIpAddress": "1.1.1.1", | ||||||
| "category": "AuditLogs", | ||||||
| "correlationId": "123456789", | ||||||
| "durationMs": 0, | ||||||
| "Level": 4, | ||||||
| "operationName": "Invite external user", | ||||||
| "operationVersion": "1.0", | ||||||
| "properties": { | ||||||
| "activityDateTime": "2024-09-23 14:33:09.049661100", | ||||||
| "activityDisplayName": "Invite external user", | ||||||
| "additionalDetails": [ | ||||||
| { | ||||||
| "key": "oid", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "tid", | ||||||
| "value": "0123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "ipaddr", | ||||||
| "value": "1.2.3.4" | ||||||
| }, | ||||||
| { | ||||||
| "key": "wids", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "InvitationId", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "invitedUserEmailAddress", | ||||||
| "value": "[email protected]" | ||||||
| } | ||||||
| ], | ||||||
| "category": "UserManagement", | ||||||
| "correlationId": "123456789", | ||||||
| "id": "Invited Users_123456789", | ||||||
| "initiatedBy": { | ||||||
| "user": { | ||||||
| "id": "123456789", | ||||||
| "ipAddress": "1.2.3.4.5", | ||||||
|
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| "roles": [], | ||||||
| "userPrincipalName": "[email protected]" | ||||||
| } | ||||||
| }, | ||||||
| "loggedByService": "Invited Users", | ||||||
| "operationType": "Add", | ||||||
| "result": "failed", | ||||||
| "targetResources": [ | ||||||
| { | ||||||
| "administrativeUnits": [], | ||||||
| "displayName": "Zeus.Theboss", | ||||||
| "id": "123456789", | ||||||
| "type": "User" | ||||||
| } | ||||||
| ] | ||||||
| }, | ||||||
| "resourceId": "/tenants/123456789/providers/Microsoft.aadiam", | ||||||
| "resultSignature": "None", | ||||||
| "tenantId": "123456789", | ||||||
| "time": "2024-12-10 14:33:09.049661100" | ||||||
| } | ||||||
| - Name: Not external invite | ||||||
| ExpectedResult: false | ||||||
| Log: | ||||||
| { | ||||||
| "callerIpAddress": "1.1.1.1", | ||||||
| "category": "AuditLogs", | ||||||
| "correlationId": "123456789", | ||||||
| "durationMs": 0, | ||||||
| "Level": 4, | ||||||
| "operationName": "Invite Internal User", | ||||||
| "operationVersion": "1.0", | ||||||
| "properties": { | ||||||
| "activityDateTime": "2024-09-23 14:33:09.049661100", | ||||||
| "activityDisplayName": "Invite external user", | ||||||
| "additionalDetails": [ | ||||||
| { | ||||||
| "key": "oid", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "tid", | ||||||
| "value": "0123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "ipaddr", | ||||||
| "value": "1.2.3.4" | ||||||
| }, | ||||||
| { | ||||||
| "key": "wids", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "InvitationId", | ||||||
| "value": "123456789" | ||||||
| }, | ||||||
| { | ||||||
| "key": "invitedUserEmailAddress", | ||||||
| "value": "[email protected]" | ||||||
| } | ||||||
| ], | ||||||
| "category": "UserManagement", | ||||||
| "correlationId": "123456789", | ||||||
| "id": "Invited Users_123456789", | ||||||
| "initiatedBy": { | ||||||
| "user": { | ||||||
| "id": "123456789", | ||||||
| "ipAddress": "1.2.3.4.5", | ||||||
|
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| "roles": [], | ||||||
| "userPrincipalName": "[email protected]" | ||||||
| } | ||||||
| }, | ||||||
| "loggedByService": "Invited Users", | ||||||
| "operationType": "Add", | ||||||
| "result": "success", | ||||||
| "targetResources": [ | ||||||
| { | ||||||
| "administrativeUnits": [], | ||||||
| "displayName": "Zeus.Theboss", | ||||||
| "id": "123456789", | ||||||
| "type": "User" | ||||||
| } | ||||||
| ] | ||||||
| }, | ||||||
| "resourceId": "/tenants/123456789/providers/Microsoft.aadiam", | ||||||
| "resultSignature": "None", | ||||||
| "tenantId": "123456789", | ||||||
| "time": "2024-12-10 14:33:09.049661100" | ||||||
| } | ||||||
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I would remove this entirely; the field isn't present in any of your sample logs, so it will always be
nulland not useful