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AuthenticationMethodsChangedforPrivilegedAccount.yaml
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AuthenticationMethodsChangedforPrivilegedAccount.yaml
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id: 694c91ee-d606-4ba9-928e-405a2dd0ff0f
name: Authentication Methods Changed for Privileged Account
description: |
'Identifies authentication methods being changed for a privileged account. This could be an indication of an attacker adding an auth method to the account so they can have continued access.
Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1'
severity: High
requiredDataConnectors:
- connectorId: AzureActiveDirectory
dataTypes:
- AuditLogs
- connectorId: BehaviorAnalytics
dataTypes:
- IdentityInfo
queryFrequency: 2h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
status: Available
tactics:
- Persistence
relevantTechniques:
- T1098
tags:
- AADSecOpsGuide
query: |
let queryperiod = 14d;
let queryfrequency = 2h;
let security_info_actions = dynamic(["User registered security info", "User changed default security info", "User deleted security info", "Admin updated security info", "User reviewed security info", "Admin deleted security info", "Admin registered security info"]);
let VIPUsers = (
IdentityInfo
| where TimeGenerated > ago(queryperiod)
| mv-expand AssignedRoles
| where AssignedRoles contains 'Admin'
| summarize by AccountUPN);
AuditLogs
| where TimeGenerated > ago(queryfrequency)
| where Category =~ "UserManagement"
| where ActivityDisplayName in (security_info_actions)
| extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
| extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
| extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
| extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
| extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
| mv-apply TargetResource = TargetResources on
(
where TargetResource.type =~ "User"
| extend TargetUserPrincipalName = tostring(TargetResource.userPrincipalName)
)
| where TargetUserPrincipalName in~ (VIPUsers)
// Uncomment the line below if you are experiencing high volumes of Target entities. If this is uncommented, the Target column will not be mapped to an entity.
//| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason, MaxSize=8), Targets=make_set(Target, MaxSize=256) by Initiator, IP, Result
// Comment out this line below, if line above is used.
| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason, MaxSize=8) by InitiatingAppName, InitiatingAppServicePrincipalId,
InitiatingUserPrincipalName, InitiatingAadUserId, InitiatingIpAddress, TargetUserPrincipalName, Result
| extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1]),
TargetName = iff(tostring(TargetUserPrincipalName) has "[", "", tostring(split(TargetUserPrincipalName,'@',0)[0])), TargetUPNSuffix = iff(tostring(TargetUserPrincipalName) has "[", "", tostring(split(TargetUserPrincipalName,'@',1)[0]))
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: InitiatingAppName
- identifier: AadUserId
columnName: InitiatingAppServicePrincipalId
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: InitiatingUserPrincipalName
- identifier: Name
columnName: InitiatingAccountName
- identifier: UPNSuffix
columnName: InitiatingAccountUPNSuffix
- entityType: Account
fieldMappings:
- identifier: AadUserId
columnName: InitiatingAadUserId
- entityType: IP
fieldMappings:
- identifier: Address
columnName: InitiatingIpAddress
version: 1.1.1
kind: Scheduled