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Group created then added to built in domain local or global group

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Ida7564d76-ec6b-4519-a66b-fcc80c42332b
RulenameGroup created then added to built in domain local or global group
DescriptionIdentifies when a recently created Group was 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.

References: For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups.
SeverityMedium
TacticsPersistence
PrivilegeEscalation
TechniquesT1098
T1078
Required data connectorsSecurityEvents
WindowsForwardedEvents
WindowsSecurityEvents
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/GroupCreatedAddedToPrivlegeGroup_1h.yaml
Version1.1.7
Arm templatea7564d76-ec6b-4519-a66b-fcc80c42332b.json
Deploy To Azure
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$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1000$";
let GroupAddition = (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"
// Exclude Remote Desktop Users group: S-1-5-32-555
| where TargetSid !in ("S-1-5-32-555")
| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, GroupAddComputer = Computer, 
GroupAddTargetAccount = TargetAccount, GroupAddTargetUserName = TargetUserName, GroupAddTargetDomainName = TargetDomainName, GroupAddTargetSid = TargetSid, 
GroupAddSubjectAccount = SubjectAccount, GroupAddSubjectUserName = SubjectUserName, GroupAddSubjectDomainName = SubjectDomainName, GroupAddSubjectUserSid = SubjectUserSid, 
GroupSid = MemberSid
),
(
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"
// Exclude Remote Desktop Users group: S-1-5-32-555
| extend TargetSid = tostring(EventData.TargetSid)
| where TargetSid !in ("S-1-5-32-555")
| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend MemberSid = tostring(EventData.MemberSid)
| extend Activity= "GroupAddActivity"
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, GroupAddComputer = Computer, 
GroupAddTargetAccount = TargetAccount, GroupAddTargetUserName = tostring(EventData.TargetUserName), GroupAddTargetDomainName = tostring(EventData.TargetDomainName), GroupAddTargetSid = TargetSid, 
GroupAddSubjectAccount = Account, GroupAddSubjectUserName = tostring(EventData.SubjectUserName), GroupAddSubjectDomainName = tostring(EventData.SubjectDomainName), GroupAddSubjectUserSid = SubjectUserSid, 
GroupSid = MemberSid
));
let GroupCreated = (union isfuzzy=true  
(SecurityEvent
// 4727 - A security-enabled global group was created
// 4731 - A security-enabled local group was created
// 4754 - A security-enabled universal group was created
| where EventID in ("4727", "4731", "4754")
| where AccountType =~ "User"
| project GroupCreateTime = TimeGenerated, GroupCreateEventID = EventID, GroupCreateActivity = Activity, GroupCreateComputer = Computer, 
GroupCreateTargetAccount = TargetAccount, GroupCreateTargetUserName = TargetUserName, GroupCreateTargetDomainName = TargetDomainName,
GroupCreateSubjectAccount = SubjectAccount, GroupCreateSubjectUserName = SubjectUserName, GroupCreateSubjectDomainName = SubjectDomainName, GroupCreateSubjectUserSid = SubjectUserSid, 
GroupSid = TargetSid
),
(WindowsEvent
// 4727 - A security-enabled global group was created
// 4731 - A security-enabled local group was created
// 4754 - A security-enabled universal group was created
| where EventID in ("4727", "4731", "4754")
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend AccountType=case(Account endswith "$", "Machine", iff(SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", iff(isempty(SubjectUserSid), "", "User")))
| where AccountType =~ "User"
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend SubjectAccount = strcat(EventData.SubjectDomainName,"\\", EventData.SubjectUserName)  
| extend TargetSid = tostring(EventData.TargetSid) 
| extend Activity= "GroupAddActivity"
| project GroupCreateTime = TimeGenerated, GroupCreateEventID = EventID, GroupCreateActivity = Activity, GroupCreateComputer = Computer, 
GroupCreateTargetAccount = TargetAccount, GroupCreateTargetUserName = tostring(EventData.TargetUserName), GroupCreateTargetDomainName = tostring(EventData.TargetDomainName), 
GroupCreateSubjectAccount = SubjectAccount, GroupCreateSubjectUserName = tostring(EventData.SubjectUserName), GroupCreateSubjectDomainName = tostring(EventData.SubjectDomainName),GroupCreateSubjectUserSid = SubjectUserSid, 
GroupSid = TargetSid
));
GroupCreated
| join (
GroupAddition
) on GroupSid
| extend GroupCreateHostName = tostring(split(GroupCreateComputer , ".")[0]), DomainIndex = toint(indexof(GroupCreateComputer , '.'))
| extend GroupCreateHostNameDomain = iff(DomainIndex != -1, substring(GroupCreateComputer , DomainIndex + 1), GroupCreateComputer)
| extend GroupAddHostName = tostring(split(GroupAddComputer , ".")[0]), DomainIndex = toint(indexof(GroupAddComputer , '.'))
| extend GroupAddHostNameDomain = iff(DomainIndex != -1, substring(GroupAddComputer , DomainIndex + 1), GroupAddComputer)
| project-away DomainIndex
triggerOperator: gt
tactics:
- Persistence
- PrivilegeEscalation
queryPeriod: 1h
kind: Scheduled
relevantTechniques:
- T1098
- T1078
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/GroupCreatedAddedToPrivlegeGroup_1h.yaml
queryFrequency: 1h
description: |
  'Identifies when a recently created Group was 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.
  References: For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups.'  
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
- dataTypes:
  - WindowsEvent
  connectorId: WindowsForwardedEvents
version: 1.1.7
triggerThreshold: 0
severity: Medium
metadata:
  author:
    name: Microsoft Security Research
  categories:
    domains:
    - Security - Others
  source:
    kind: Community
  support:
    tier: Community
id: a7564d76-ec6b-4519-a66b-fcc80c42332b
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: GroupCreateSubjectAccount
    identifier: FullName
  - columnName: GroupCreateSubjectUserName
    identifier: Name
  - columnName: GroupCreateSubjectDomainName
    identifier: NTDomain
- entityType: Account
  fieldMappings:
  - columnName: GroupCreateTargetAccount
    identifier: FullName
  - columnName: GroupAddSubjectUserName
    identifier: Name
  - columnName: GroupAddSubjectDomainName
    identifier: NTDomain
- entityType: Host
  fieldMappings:
  - columnName: GroupCreateComputer
    identifier: FullName
  - columnName: GroupCreateHostName
    identifier: HostName
  - columnName: GroupCreateHostNameDomain
    identifier: DnsDomain
- entityType: Host
  fieldMappings:
  - columnName: GroupAddComputer
    identifier: FullName
  - columnName: GroupAddHostName
    identifier: HostName
  - columnName: GroupAddHostNameDomain
    identifier: DnsDomain
name: Group created then added to built in domain local or global group
query: |
  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$|S-1-5-21-[0-9]*-[0-9]*-[0-9]*-1000$";
  let GroupAddition = (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"
  // Exclude Remote Desktop Users group: S-1-5-32-555
  | where TargetSid !in ("S-1-5-32-555")
  | where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
  | project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, GroupAddComputer = Computer, 
  GroupAddTargetAccount = TargetAccount, GroupAddTargetUserName = TargetUserName, GroupAddTargetDomainName = TargetDomainName, GroupAddTargetSid = TargetSid, 
  GroupAddSubjectAccount = SubjectAccount, GroupAddSubjectUserName = SubjectUserName, GroupAddSubjectDomainName = SubjectDomainName, GroupAddSubjectUserSid = SubjectUserSid, 
  GroupSid = MemberSid
  ),
  (
  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"
  // Exclude Remote Desktop Users group: S-1-5-32-555
  | extend TargetSid = tostring(EventData.TargetSid)
  | where TargetSid !in ("S-1-5-32-555")
  | where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID
  | extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
  | extend MemberSid = tostring(EventData.MemberSid)
  | extend Activity= "GroupAddActivity"
  | project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, GroupAddComputer = Computer, 
  GroupAddTargetAccount = TargetAccount, GroupAddTargetUserName = tostring(EventData.TargetUserName), GroupAddTargetDomainName = tostring(EventData.TargetDomainName), GroupAddTargetSid = TargetSid, 
  GroupAddSubjectAccount = Account, GroupAddSubjectUserName = tostring(EventData.SubjectUserName), GroupAddSubjectDomainName = tostring(EventData.SubjectDomainName), GroupAddSubjectUserSid = SubjectUserSid, 
  GroupSid = MemberSid
  ));
  let GroupCreated = (union isfuzzy=true  
  (SecurityEvent
  // 4727 - A security-enabled global group was created
  // 4731 - A security-enabled local group was created
  // 4754 - A security-enabled universal group was created
  | where EventID in ("4727", "4731", "4754")
  | where AccountType =~ "User"
  | project GroupCreateTime = TimeGenerated, GroupCreateEventID = EventID, GroupCreateActivity = Activity, GroupCreateComputer = Computer, 
  GroupCreateTargetAccount = TargetAccount, GroupCreateTargetUserName = TargetUserName, GroupCreateTargetDomainName = TargetDomainName,
  GroupCreateSubjectAccount = SubjectAccount, GroupCreateSubjectUserName = SubjectUserName, GroupCreateSubjectDomainName = SubjectDomainName, GroupCreateSubjectUserSid = SubjectUserSid, 
  GroupSid = TargetSid
  ),
  (WindowsEvent
  // 4727 - A security-enabled global group was created
  // 4731 - A security-enabled local group was created
  // 4754 - A security-enabled universal group was created
  | where EventID in ("4727", "4731", "4754")
  | extend SubjectUserSid = tostring(EventData.SubjectUserSid)
  | extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
  | extend AccountType=case(Account endswith "$", "Machine", iff(SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", iff(isempty(SubjectUserSid), "", "User")))
  | where AccountType =~ "User"
  | extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
  | extend SubjectAccount = strcat(EventData.SubjectDomainName,"\\", EventData.SubjectUserName)  
  | extend TargetSid = tostring(EventData.TargetSid) 
  | extend Activity= "GroupAddActivity"
  | project GroupCreateTime = TimeGenerated, GroupCreateEventID = EventID, GroupCreateActivity = Activity, GroupCreateComputer = Computer, 
  GroupCreateTargetAccount = TargetAccount, GroupCreateTargetUserName = tostring(EventData.TargetUserName), GroupCreateTargetDomainName = tostring(EventData.TargetDomainName), 
  GroupCreateSubjectAccount = SubjectAccount, GroupCreateSubjectUserName = tostring(EventData.SubjectUserName), GroupCreateSubjectDomainName = tostring(EventData.SubjectDomainName),GroupCreateSubjectUserSid = SubjectUserSid, 
  GroupSid = TargetSid
  ));
  GroupCreated
  | join (
  GroupAddition
  ) on GroupSid
  | extend GroupCreateHostName = tostring(split(GroupCreateComputer , ".")[0]), DomainIndex = toint(indexof(GroupCreateComputer , '.'))
  | extend GroupCreateHostNameDomain = iff(DomainIndex != -1, substring(GroupCreateComputer , DomainIndex + 1), GroupCreateComputer)
  | extend GroupAddHostName = tostring(split(GroupAddComputer , ".")[0]), DomainIndex = toint(indexof(GroupAddComputer , '.'))
  | extend GroupAddHostNameDomain = iff(DomainIndex != -1, substring(GroupAddComputer , DomainIndex + 1), GroupAddComputer)
  | project-away DomainIndex  
{
  "$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/a7564d76-ec6b-4519-a66b-fcc80c42332b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a7564d76-ec6b-4519-a66b-fcc80c42332b')]",
      "properties": {
        "alertRuleTemplateName": "a7564d76-ec6b-4519-a66b-fcc80c42332b",
        "customDetails": null,
        "description": "'Identifies when a recently created Group was 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.\nReferences: For AD SID mappings - https://docs.microsoft.com/windows/security/identity-protection/access-control/active-directory-security-groups.'\n",
        "displayName": "Group created then added to built in domain local or global group",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "GroupCreateSubjectAccount",
                "identifier": "FullName"
              },
              {
                "columnName": "GroupCreateSubjectUserName",
                "identifier": "Name"
              },
              {
                "columnName": "GroupCreateSubjectDomainName",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "GroupCreateTargetAccount",
                "identifier": "FullName"
              },
              {
                "columnName": "GroupAddSubjectUserName",
                "identifier": "Name"
              },
              {
                "columnName": "GroupAddSubjectDomainName",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "GroupCreateComputer",
                "identifier": "FullName"
              },
              {
                "columnName": "GroupCreateHostName",
                "identifier": "HostName"
              },
              {
                "columnName": "GroupCreateHostNameDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "GroupAddComputer",
                "identifier": "FullName"
              },
              {
                "columnName": "GroupAddHostName",
                "identifier": "HostName"
              },
              {
                "columnName": "GroupAddHostNameDomain",
                "identifier": "DnsDomain"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/GroupCreatedAddedToPrivlegeGroup_1h.yaml",
        "query": "let 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$\";\nlet GroupAddition = (union isfuzzy=true   \n(SecurityEvent \n// 4728 - A member was added to a security-enabled global group\n// 4732 - A member was added to a security-enabled local group\n// 4756 - A member was added to a security-enabled universal group  \n| where EventID in (\"4728\", \"4732\", \"4756\")\n| where AccountType =~ \"User\"\n// Exclude Remote Desktop Users group: S-1-5-32-555\n| where TargetSid !in (\"S-1-5-32-555\")\n| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID\n| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, GroupAddComputer = Computer, \nGroupAddTargetAccount = TargetAccount, GroupAddTargetUserName = TargetUserName, GroupAddTargetDomainName = TargetDomainName, GroupAddTargetSid = TargetSid, \nGroupAddSubjectAccount = SubjectAccount, GroupAddSubjectUserName = SubjectUserName, GroupAddSubjectDomainName = SubjectDomainName, GroupAddSubjectUserSid = SubjectUserSid, \nGroupSid = MemberSid\n),\n(\nWindowsEvent \n// 4728 - A member was added to a security-enabled global group\n// 4732 - A member was added to a security-enabled local group\n// 4756 - A member was added to a security-enabled universal group  \n| where EventID in (\"4728\", \"4732\", \"4756\")  and not(EventData has \"S-1-5-32-555\")\n| extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n| extend Account = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend AccountType=case(Account endswith \"$\" 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// Exclude Remote Desktop Users group: S-1-5-32-555\n| extend TargetSid = tostring(EventData.TargetSid)\n| where TargetSid !in (\"S-1-5-32-555\")\n| where TargetSid matches regex WellKnownLocalSID or TargetSid matches regex WellKnownGroupSID\n| extend TargetAccount = strcat(EventData.TargetDomainName,\"\\\\\", EventData.TargetUserName)\n| extend MemberSid = tostring(EventData.MemberSid)\n| extend Activity= \"GroupAddActivity\"\n| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, GroupAddComputer = Computer, \nGroupAddTargetAccount = TargetAccount, GroupAddTargetUserName = tostring(EventData.TargetUserName), GroupAddTargetDomainName = tostring(EventData.TargetDomainName), GroupAddTargetSid = TargetSid, \nGroupAddSubjectAccount = Account, GroupAddSubjectUserName = tostring(EventData.SubjectUserName), GroupAddSubjectDomainName = tostring(EventData.SubjectDomainName), GroupAddSubjectUserSid = SubjectUserSid, \nGroupSid = MemberSid\n));\nlet GroupCreated = (union isfuzzy=true  \n(SecurityEvent\n// 4727 - A security-enabled global group was created\n// 4731 - A security-enabled local group was created\n// 4754 - A security-enabled universal group was created\n| where EventID in (\"4727\", \"4731\", \"4754\")\n| where AccountType =~ \"User\"\n| project GroupCreateTime = TimeGenerated, GroupCreateEventID = EventID, GroupCreateActivity = Activity, GroupCreateComputer = Computer, \nGroupCreateTargetAccount = TargetAccount, GroupCreateTargetUserName = TargetUserName, GroupCreateTargetDomainName = TargetDomainName,\nGroupCreateSubjectAccount = SubjectAccount, GroupCreateSubjectUserName = SubjectUserName, GroupCreateSubjectDomainName = SubjectDomainName, GroupCreateSubjectUserSid = SubjectUserSid, \nGroupSid = TargetSid\n),\n(WindowsEvent\n// 4727 - A security-enabled global group was created\n// 4731 - A security-enabled local group was created\n// 4754 - A security-enabled universal group was created\n| where EventID in (\"4727\", \"4731\", \"4754\")\n| extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n| extend Account = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend AccountType=case(Account endswith \"$\", \"Machine\", iff(SubjectUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", iff(isempty(SubjectUserSid), \"\", \"User\")))\n| where AccountType =~ \"User\"\n| extend TargetAccount = strcat(EventData.TargetDomainName,\"\\\\\", EventData.TargetUserName)\n| extend SubjectAccount = strcat(EventData.SubjectDomainName,\"\\\\\", EventData.SubjectUserName)  \n| extend TargetSid = tostring(EventData.TargetSid) \n| extend Activity= \"GroupAddActivity\"\n| project GroupCreateTime = TimeGenerated, GroupCreateEventID = EventID, GroupCreateActivity = Activity, GroupCreateComputer = Computer, \nGroupCreateTargetAccount = TargetAccount, GroupCreateTargetUserName = tostring(EventData.TargetUserName), GroupCreateTargetDomainName = tostring(EventData.TargetDomainName), \nGroupCreateSubjectAccount = SubjectAccount, GroupCreateSubjectUserName = tostring(EventData.SubjectUserName), GroupCreateSubjectDomainName = tostring(EventData.SubjectDomainName),GroupCreateSubjectUserSid = SubjectUserSid, \nGroupSid = TargetSid\n));\nGroupCreated\n| join (\nGroupAddition\n) on GroupSid\n| extend GroupCreateHostName = tostring(split(GroupCreateComputer , \".\")[0]), DomainIndex = toint(indexof(GroupCreateComputer , '.'))\n| extend GroupCreateHostNameDomain = iff(DomainIndex != -1, substring(GroupCreateComputer , DomainIndex + 1), GroupCreateComputer)\n| extend GroupAddHostName = tostring(split(GroupAddComputer , \".\")[0]), DomainIndex = toint(indexof(GroupAddComputer , '.'))\n| extend GroupAddHostNameDomain = iff(DomainIndex != -1, substring(GroupAddComputer , DomainIndex + 1), GroupAddComputer)\n| project-away DomainIndex\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078",
          "T1098"
        ],
        "templateVersion": "1.1.7",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}