User account added to built in domain local or global group
Id | a35f2c18-1b97-458f-ad26-e033af18eb99 |
Rulename | User account added to built in domain local or global group |
Description | Identifies when a user account has been added to a privileged built in domain local group or global group such as the Enterprise Admins, Cert Publishers or DnsAdmins. Be sure to verify this is an expected addition. |
Severity | Low |
Tactics | Persistence PrivilegeEscalation |
Techniques | T1098 T1078 |
Required data connectors | SecurityEvents WindowsForwardedEvents WindowsSecurityEvents |
Kind | Scheduled |
Query frequency | 1d |
Query period | 1d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserAccountAddedToPrivlegeGroup_1h.yaml |
Version | 1.3.5 |
Arm template | a35f2c18-1b97-458f-ad26-e033af18eb99.json |
// For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups
let WellKnownLocalSID = "S-1-5-32-5[0-9][0-9]$";
let WellKnownGroupSID = "S-1-5-21-[0-9]*-[0-9]*-[0-9]*-5[0-9][0-9]$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1102$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1103$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-498$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1000$";
union isfuzzy=true
(
SecurityEvent
// 4728 - A member was added to a security-enabled global group
// 4732 - A member was added to a security-enabled local group
// 4756 - A member was added to a security-enabled universal group
| where EventID in (4728, 4732, 4756)
| where AccountType == "User"
| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
// Exclude Remote Desktop Users group: S-1-5-32-555
| where TargetSid !in ("S-1-5-32-555")
| extend SimpleMemberName = substring(MemberName, 3, indexof_regex(MemberName, @",OU|,CN") - 3)
| project TimeGenerated, EventID, Activity, Computer, SimpleMemberName, MemberName, MemberSid, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, SubjectUserName, SubjectUserSid
),
(
WindowsEvent
// 4728 - A member was added to a security-enabled global group
// 4732 - A member was added to a security-enabled local group
// 4756 - A member was added to a security-enabled universal group
| where EventID in (4728, 4732, 4756) and not(EventData has "S-1-5-32-555")
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend AccountType=case(Account endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| extend MemberName = tostring(EventData.MemberName)
| where AccountType == "User"
| extend TargetSid = tostring(EventData.TargetSid)
| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
// Exclude Remote Desktop Users group: S-1-5-32-555
| where TargetSid !in ("S-1-5-32-555")
| extend SimpleMemberName = substring(MemberName, 3, indexof_regex(MemberName, @",OU|,CN") - 3)
| extend MemberSid = tostring(EventData.MemberSid)
| extend TargetUserName = tostring(EventData.TargetUserName)
| extend TargetDomainName = tostring(EventData.TargetDomainName)
| extend UserPrincipalName = tostring(EventData.UserPrincipalName)
| extend SubjectUserName = tostring(EventData.SubjectUserName)
| project TimeGenerated, EventID, Computer, SimpleMemberName, MemberName, MemberSid, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, SubjectUserName, SubjectUserSid
)
id: a35f2c18-1b97-458f-ad26-e033af18eb99
queryPeriod: 1d
severity: Low
kind: Scheduled
query: |
// For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups
let WellKnownLocalSID = "S-1-5-32-5[0-9][0-9]$";
let WellKnownGroupSID = "S-1-5-21-[0-9]*-[0-9]*-[0-9]*-5[0-9][0-9]$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1102$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1103$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-498$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1000$";
union isfuzzy=true
(
SecurityEvent
// 4728 - A member was added to a security-enabled global group
// 4732 - A member was added to a security-enabled local group
// 4756 - A member was added to a security-enabled universal group
| where EventID in (4728, 4732, 4756)
| where AccountType == "User"
| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
// Exclude Remote Desktop Users group: S-1-5-32-555
| where TargetSid !in ("S-1-5-32-555")
| extend SimpleMemberName = substring(MemberName, 3, indexof_regex(MemberName, @",OU|,CN") - 3)
| project TimeGenerated, EventID, Activity, Computer, SimpleMemberName, MemberName, MemberSid, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, SubjectUserName, SubjectUserSid
),
(
WindowsEvent
// 4728 - A member was added to a security-enabled global group
// 4732 - A member was added to a security-enabled local group
// 4756 - A member was added to a security-enabled universal group
| where EventID in (4728, 4732, 4756) and not(EventData has "S-1-5-32-555")
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend AccountType=case(Account endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| extend MemberName = tostring(EventData.MemberName)
| where AccountType == "User"
| extend TargetSid = tostring(EventData.TargetSid)
| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
// Exclude Remote Desktop Users group: S-1-5-32-555
| where TargetSid !in ("S-1-5-32-555")
| extend SimpleMemberName = substring(MemberName, 3, indexof_regex(MemberName, @",OU|,CN") - 3)
| extend MemberSid = tostring(EventData.MemberSid)
| extend TargetUserName = tostring(EventData.TargetUserName)
| extend TargetDomainName = tostring(EventData.TargetDomainName)
| extend UserPrincipalName = tostring(EventData.UserPrincipalName)
| extend SubjectUserName = tostring(EventData.SubjectUserName)
| project TimeGenerated, EventID, Computer, SimpleMemberName, MemberName, MemberSid, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, SubjectUserName, SubjectUserSid
)
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: SimpleMemberName
entityType: Account
- fieldMappings:
- identifier: FullName
columnName: Computer
entityType: Host
triggerThreshold: 0
metadata:
categories:
domains:
- Security - Others
- Identity
author:
name: Shain
source:
kind: Community
support:
tier: Community
description: |
'Identifies when a user account has been added to a privileged built in domain local group or global group
such as the Enterprise Admins, Cert Publishers or DnsAdmins. Be sure to verify this is an expected addition.'
name: User account added to built in domain local or global group
relevantTechniques:
- T1098
- T1078
queryFrequency: 1d
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsForwardedEvents
dataTypes:
- WindowsEvent
tactics:
- Persistence
- PrivilegeEscalation
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserAccountAddedToPrivlegeGroup_1h.yaml
version: 1.3.5
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a35f2c18-1b97-458f-ad26-e033af18eb99')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a35f2c18-1b97-458f-ad26-e033af18eb99')]",
"properties": {
"alertRuleTemplateName": "a35f2c18-1b97-458f-ad26-e033af18eb99",
"customDetails": null,
"description": "'Identifies when a user account has been added to a privileged built in domain local group or global group\nsuch as the Enterprise Admins, Cert Publishers or DnsAdmins. Be sure to verify this is an expected addition.'\n",
"displayName": "User account added to built in domain local or global group",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "SimpleMemberName",
"identifier": "FullName"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "Computer",
"identifier": "FullName"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserAccountAddedToPrivlegeGroup_1h.yaml",
"query": "// For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups\nlet WellKnownLocalSID = \"S-1-5-32-5[0-9][0-9]$\";\nlet WellKnownGroupSID = \"S-1-5-21-[0-9]*-[0-9]*-[0-9]*-5[0-9][0-9]$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1102$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1103$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-498$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1000$\";\nunion isfuzzy=true\n(\nSecurityEvent\n// 4728 - A member was added to a security-enabled global group\n// 4732 - A member was added to a security-enabled local group\n// 4756 - A member was added to a security-enabled universal group\n| where EventID in (4728, 4732, 4756)\n| where AccountType == \"User\"\n| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID\n// Exclude Remote Desktop Users group: S-1-5-32-555\n| where TargetSid !in (\"S-1-5-32-555\")\n| extend SimpleMemberName = substring(MemberName, 3, indexof_regex(MemberName, @\",OU|,CN\") - 3)\n| project TimeGenerated, EventID, Activity, Computer, SimpleMemberName, MemberName, MemberSid, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, SubjectUserName, SubjectUserSid\n),\n(\nWindowsEvent\n// 4728 - A member was added to a security-enabled global group\n// 4732 - A member was added to a security-enabled local group\n// 4756 - A member was added to a security-enabled universal group\n| where EventID in (4728, 4732, 4756) and not(EventData has \"S-1-5-32-555\")\n| extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n| extend Account = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend AccountType=case(Account endswith \"$\" or SubjectUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", isempty(SubjectUserSid), \"\", \"User\")\n| extend MemberName = tostring(EventData.MemberName)\n| where AccountType == \"User\"\n| extend TargetSid = tostring(EventData.TargetSid)\n| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID\n// Exclude Remote Desktop Users group: S-1-5-32-555\n| where TargetSid !in (\"S-1-5-32-555\")\n| extend SimpleMemberName = substring(MemberName, 3, indexof_regex(MemberName, @\",OU|,CN\") - 3)\n| extend MemberSid = tostring(EventData.MemberSid)\n| extend TargetUserName = tostring(EventData.TargetUserName)\n| extend TargetDomainName = tostring(EventData.TargetDomainName)\n| extend UserPrincipalName = tostring(EventData.UserPrincipalName)\n| extend SubjectUserName = tostring(EventData.SubjectUserName)\n| project TimeGenerated, EventID, Computer, SimpleMemberName, MemberName, MemberSid, TargetUserName, TargetDomainName, TargetSid, UserPrincipalName, SubjectUserName, SubjectUserSid\n)\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Low",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence",
"PrivilegeEscalation"
],
"techniques": [
"T1078",
"T1098"
],
"templateVersion": "1.3.5",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}