New user created and added to the built-in administrators group
| Id | aa1eff90-29d4-49dc-a3ea-b65199f516db |
| Rulename | New user created and added to the built-in administrators group |
| Description | Identifies when a user account was created and then added to the builtin Administrators group in the same day. This should be monitored closely and all additions reviewed. |
| 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/UserCreatedAddedToBuiltinAdmins_1d.yaml |
| Version | 1.2.1 |
| Arm template | aa1eff90-29d4-49dc-a3ea-b65199f516db.json |
(union isfuzzy=true
(SecurityEvent
| where EventID == 4720
| where AccountType == "User"
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserAccountName = TargetUserName, CreatedUserDomainName = TargetDomainName, CreatedUserSid = TargetSid,
AccountUsedToCreateUser = SubjectAccount, CreatedByAccountName = SubjectUserName, CreatedByDomainName = SubjectDomainName, SidofAccountUsedToCreateUser = SubjectUserSid
),
(WindowsEvent
| where EventID == 4720
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName)
| extend Activity="4720 - A user account was created."
| extend TargetSid = tostring(EventData.TargetSid)
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserAccountName = TargetUserName, CreatedUserDomainName = TargetDomainName, CreatedUserSid = TargetSid,
AccountUsedToCreateUser = SubjectAccount, CreatedByAccountName = SubjectUserName, CreatedByDomainName = SubjectDomainName, SidofAccountUsedToCreateUser = SubjectUserSid
)
)
| join kind=inner
(
(union isfuzzy=true
(SecurityEvent
| where AccountType == "User"
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732
// TargetSid is the builin Admins group: S-1-5-32-544
| where TargetSid == "S-1-5-32-544"
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount),
GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, AddedByAccountName = SubjectUserName, AddedByDomainName = SubjectDomainName,
CreatedUserSid = MemberSid
),
( WindowsEvent
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732 and EventData has "S-1-5-32-544"
//TargetSid is the builin Admins group: S-1-5-32-544
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend TargetSid = tostring(EventData.TargetSid)
| where TargetSid == "S-1-5-32-544"
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend Activity="4732 - A member was added to a security-enabled local group."
| extend MemberSid = tostring(EventData.MemberSid)
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount),
GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, AddedByAccountName = SubjectUserName, AddedByDomainName = SubjectDomainName,
CreatedUserSid = MemberSid
)
)
)
on CreatedUserSid
//Create User first, then the add to the group.
| project Computer, CreatedUserTime, CreatedUserEventID, CreatedUserActivity, CreatedUser, CreatedUserSid, CreatedUserAccountName, CreatedUserDomainName,
GroupAddTime, GroupAddEventID, GroupAddActivity, GroupName, GroupSid,
AccountUsedToCreateUser, SidofAccountUsedToCreateUser, CreatedByAccountName, CreatedByDomainName,
AccountThatAddedUser, SIDofAccountThatAddedUser, AddedByAccountName, AddedByDomainName
| extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
| project-away DomainIndex
queryPeriod: 1d
queryFrequency: 1d
name: New user created and added to the built-in administrators group
id: aa1eff90-29d4-49dc-a3ea-b65199f516db
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountUsedToCreateUser
identifier: FullName
- columnName: CreatedByAccountName
identifier: Name
- columnName: CreatedByDomainName
identifier: NTDomain
- entityType: Account
fieldMappings:
- columnName: AccountThatAddedUser
identifier: FullName
- columnName: AddedByAccountName
identifier: Name
- columnName: AddedByDomainName
identifier: NTDomain
- entityType: Account
fieldMappings:
- columnName: CreatedUser
identifier: FullName
- columnName: CreatedUserAccountName
identifier: Name
- columnName: CreatedUserDomainName
identifier: NTDomain
- entityType: Account
fieldMappings:
- columnName: CreatedUserSid
identifier: Sid
- entityType: Host
fieldMappings:
- columnName: Computer
identifier: FullName
- columnName: HostName
identifier: HostName
- columnName: HostNameDomain
identifier: NTDomain
query: |
(union isfuzzy=true
(SecurityEvent
| where EventID == 4720
| where AccountType == "User"
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserAccountName = TargetUserName, CreatedUserDomainName = TargetDomainName, CreatedUserSid = TargetSid,
AccountUsedToCreateUser = SubjectAccount, CreatedByAccountName = SubjectUserName, CreatedByDomainName = SubjectDomainName, SidofAccountUsedToCreateUser = SubjectUserSid
),
(WindowsEvent
| where EventID == 4720
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName)
| extend Activity="4720 - A user account was created."
| extend TargetSid = tostring(EventData.TargetSid)
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserAccountName = TargetUserName, CreatedUserDomainName = TargetDomainName, CreatedUserSid = TargetSid,
AccountUsedToCreateUser = SubjectAccount, CreatedByAccountName = SubjectUserName, CreatedByDomainName = SubjectDomainName, SidofAccountUsedToCreateUser = SubjectUserSid
)
)
| join kind=inner
(
(union isfuzzy=true
(SecurityEvent
| where AccountType == "User"
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732
// TargetSid is the builin Admins group: S-1-5-32-544
| where TargetSid == "S-1-5-32-544"
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount),
GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, AddedByAccountName = SubjectUserName, AddedByDomainName = SubjectDomainName,
CreatedUserSid = MemberSid
),
( WindowsEvent
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732 and EventData has "S-1-5-32-544"
//TargetSid is the builin Admins group: S-1-5-32-544
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend TargetSid = tostring(EventData.TargetSid)
| where TargetSid == "S-1-5-32-544"
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend Activity="4732 - A member was added to a security-enabled local group."
| extend MemberSid = tostring(EventData.MemberSid)
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount),
GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, AddedByAccountName = SubjectUserName, AddedByDomainName = SubjectDomainName,
CreatedUserSid = MemberSid
)
)
)
on CreatedUserSid
//Create User first, then the add to the group.
| project Computer, CreatedUserTime, CreatedUserEventID, CreatedUserActivity, CreatedUser, CreatedUserSid, CreatedUserAccountName, CreatedUserDomainName,
GroupAddTime, GroupAddEventID, GroupAddActivity, GroupName, GroupSid,
AccountUsedToCreateUser, SidofAccountUsedToCreateUser, CreatedByAccountName, CreatedByDomainName,
AccountThatAddedUser, SIDofAccountThatAddedUser, AddedByAccountName, AddedByDomainName
| extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
| project-away DomainIndex
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserCreatedAddedToBuiltinAdmins_1d.yaml
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvents
- connectorId: WindowsForwardedEvents
dataTypes:
- WindowsEvent
relevantTechniques:
- T1098
- T1078
metadata:
support:
tier: Community
categories:
domains:
- Security - Others
- Identity
source:
kind: Community
author:
name: Microsoft Security Research
description: |
'Identifies when a user account was created and then added to the builtin Administrators group in the same day.
This should be monitored closely and all additions reviewed.'
tactics:
- Persistence
- PrivilegeEscalation
severity: Low
triggerThreshold: 0
version: 1.2.1
kind: Scheduled
triggerOperator: gt
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/aa1eff90-29d4-49dc-a3ea-b65199f516db')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/aa1eff90-29d4-49dc-a3ea-b65199f516db')]",
"properties": {
"alertRuleTemplateName": "aa1eff90-29d4-49dc-a3ea-b65199f516db",
"customDetails": null,
"description": "'Identifies when a user account was created and then added to the builtin Administrators group in the same day.\nThis should be monitored closely and all additions reviewed.'\n",
"displayName": "New user created and added to the built-in administrators group",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountUsedToCreateUser",
"identifier": "FullName"
},
{
"columnName": "CreatedByAccountName",
"identifier": "Name"
},
{
"columnName": "CreatedByDomainName",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountThatAddedUser",
"identifier": "FullName"
},
{
"columnName": "AddedByAccountName",
"identifier": "Name"
},
{
"columnName": "AddedByDomainName",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "CreatedUser",
"identifier": "FullName"
},
{
"columnName": "CreatedUserAccountName",
"identifier": "Name"
},
{
"columnName": "CreatedUserDomainName",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "CreatedUserSid",
"identifier": "Sid"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "Computer",
"identifier": "FullName"
},
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "HostNameDomain",
"identifier": "NTDomain"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserCreatedAddedToBuiltinAdmins_1d.yaml",
"query": "(union isfuzzy=true\n (SecurityEvent\n | where EventID == 4720\n | where AccountType == \"User\"\n | project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer), \n CreatedUser = tolower(TargetAccount), CreatedUserAccountName = TargetUserName, CreatedUserDomainName = TargetDomainName, CreatedUserSid = TargetSid, \n AccountUsedToCreateUser = SubjectAccount, CreatedByAccountName = SubjectUserName, CreatedByDomainName = SubjectDomainName, SidofAccountUsedToCreateUser = SubjectUserSid\n ),\n (WindowsEvent\n | where EventID == 4720\n | extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n | extend AccountType=case(EventData.SubjectUserName endswith \"$\" or SubjectUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", isempty(SubjectUserSid), \"\", \"User\")\n | where AccountType == \"User\"\n | extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n | extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)\n | extend TargetAccount = strcat(EventData.TargetDomainName,\"\\\\\", EventData.TargetUserName)\n | extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName) \n | extend Activity=\"4720 - A user account was created.\"\n | extend TargetSid = tostring(EventData.TargetSid)\n | project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer), \n CreatedUser = tolower(TargetAccount), CreatedUserAccountName = TargetUserName, CreatedUserDomainName = TargetDomainName, CreatedUserSid = TargetSid, \n AccountUsedToCreateUser = SubjectAccount, CreatedByAccountName = SubjectUserName, CreatedByDomainName = SubjectDomainName, SidofAccountUsedToCreateUser = SubjectUserSid\n )\n )\n| join kind=inner\n(\n (union isfuzzy=true\n (SecurityEvent \n | where AccountType == \"User\"\n // 4732 - A member was added to a security-enabled local group\n | where EventID == 4732\n // TargetSid is the builin Admins group: S-1-5-32-544\n | where TargetSid == \"S-1-5-32-544\"\n | project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount), \n GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, AddedByAccountName = SubjectUserName, AddedByDomainName = SubjectDomainName,\n CreatedUserSid = MemberSid\n ),\n ( WindowsEvent \n // 4732 - A member was added to a security-enabled local group\n | where EventID == 4732 and EventData has \"S-1-5-32-544\"\n //TargetSid is the builin Admins group: S-1-5-32-544\n | extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n | extend AccountType=case(EventData.SubjectUserName endswith \"$\" or SubjectUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", isempty(SubjectUserSid), \"\", \"User\")\n | where AccountType == \"User\"\n | extend TargetSid = tostring(EventData.TargetSid)\n | where TargetSid == \"S-1-5-32-544\"\n | extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n | extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)\n | extend TargetAccount = strcat(EventData.TargetDomainName,\"\\\\\", EventData.TargetUserName)\n | extend Activity=\"4732 - A member was added to a security-enabled local group.\"\n | extend MemberSid = tostring(EventData.MemberSid)\n | project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount), \n GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, AddedByAccountName = SubjectUserName, AddedByDomainName = SubjectDomainName,\n CreatedUserSid = MemberSid\n )\n )\n)\non CreatedUserSid\n//Create User first, then the add to the group.\n| project Computer, CreatedUserTime, CreatedUserEventID, CreatedUserActivity, CreatedUser, CreatedUserSid, CreatedUserAccountName, CreatedUserDomainName,\nGroupAddTime, GroupAddEventID, GroupAddActivity, GroupName, GroupSid,\nAccountUsedToCreateUser, SidofAccountUsedToCreateUser, CreatedByAccountName, CreatedByDomainName, \nAccountThatAddedUser, SIDofAccountThatAddedUser, AddedByAccountName, AddedByDomainName\n| extend HostName = tostring(split(Computer, \".\")[0]), DomainIndex = toint(indexof(Computer, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)\n| project-away DomainIndex\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Low",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence",
"PrivilegeEscalation"
],
"techniques": [
"T1078",
"T1098"
],
"templateVersion": "1.2.1",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}