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 | 1.1.3 |
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), CreatedUserSid = TargetSid, AccountUsedToCreateUser = strcat(SubjectAccount), SidofAccountUsedToCreateUser = SubjectUserSid
),
(WindowsEvent
| where EventID == 4720
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend Activity="4720 - A user account was created."
| extend TargetSid = tostring(EventData.TargetSid)
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserSid = TargetSid, AccountUsedToCreateUser = strcat(SubjectAccount), SidofAccountUsedToCreateUser = SubjectUserSid
))
| join ((union isfuzzy=true
(SecurityEvent
| where AccountType == "User"
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732
// TargetSid is the builin Admins group: S-1-5-32-544
| where TargetSid == "S-1-5-32-544"
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount),
GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, CreatedUserSid = MemberSid
),
( WindowsEvent
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732 and EventData has "S-1-5-32-544"
//TargetSid is the builin Admins group: S-1-5-32-544
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" 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 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, CreatedUserSid = MemberSid)
))
on CreatedUserSid
//Create User first, then the add to the group.
| project Computer, CreatedUserTime, CreatedUserEventID, CreatedUserActivity, CreatedUser, CreatedUserSid, GroupAddTime, GroupAddEventID,
GroupAddActivity, AccountUsedToCreateUser, GroupName, GroupSid, AccountThatAddedUser, SIDofAccountThatAddedUser
| extend timestamp = CreatedUserTime, AccountCustomEntity = CreatedUser, HostCustomEntity = Computer
triggerOperator: gt
version: 1.1.3
query: |
(union isfuzzy=true
(SecurityEvent
| where EventID == 4720
| where AccountType == "User"
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserSid = TargetSid, AccountUsedToCreateUser = strcat(SubjectAccount), SidofAccountUsedToCreateUser = SubjectUserSid
),
(WindowsEvent
| where EventID == 4720
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| extend Activity="4720 - A user account was created."
| extend TargetSid = tostring(EventData.TargetSid)
| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer),
CreatedUser = tolower(TargetAccount), CreatedUserSid = TargetSid, AccountUsedToCreateUser = strcat(SubjectAccount), SidofAccountUsedToCreateUser = SubjectUserSid
))
| join ((union isfuzzy=true
(SecurityEvent
| where AccountType == "User"
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732
// TargetSid is the builin Admins group: S-1-5-32-544
| where TargetSid == "S-1-5-32-544"
| project GroupAddTime = TimeGenerated, GroupAddEventID = EventID, GroupAddActivity = Activity, Computer = toupper(Computer), GroupName = tolower(TargetAccount),
GroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, CreatedUserSid = MemberSid
),
( WindowsEvent
// 4732 - A member was added to a security-enabled local group
| where EventID == 4732 and EventData has "S-1-5-32-544"
//TargetSid is the builin Admins group: S-1-5-32-544
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend AccountType=case(EventData.SubjectUserName endswith "$" 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 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, CreatedUserSid = MemberSid)
))
on CreatedUserSid
//Create User first, then the add to the group.
| project Computer, CreatedUserTime, CreatedUserEventID, CreatedUserActivity, CreatedUser, CreatedUserSid, GroupAddTime, GroupAddEventID,
GroupAddActivity, AccountUsedToCreateUser, GroupName, GroupSid, AccountThatAddedUser, SIDofAccountThatAddedUser
| extend timestamp = CreatedUserTime, AccountCustomEntity = CreatedUser, HostCustomEntity = Computer
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
- columnName: CreatedUserSid
identifier: Sid
- entityType: Host
fieldMappings:
- columnName: HostCustomEntity
identifier: FullName
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserCreatedAddedToBuiltinAdmins_1d.yaml
queryFrequency: 1d
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvents
- connectorId: WindowsForwardedEvents
dataTypes:
- WindowsEvent
metadata:
source:
kind: Community
author:
name: Shain
categories:
domains:
- Security - Others
- Identity
support:
tier: Community
name: New user created and added to the built-in administrators group
queryPeriod: 1d
severity: Low
kind: Scheduled
tactics:
- Persistence
- PrivilegeEscalation
id: aa1eff90-29d4-49dc-a3ea-b65199f516db
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.'
relevantTechniques:
- T1098
- T1078
triggerThreshold: 0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/aa1eff90-29d4-49dc-a3ea-b65199f516db')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/aa1eff90-29d4-49dc-a3ea-b65199f516db')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "New user created and added to the built-in administrators group",
"description": "'Identifies when a user account was created and then added to the builtin Administrators group in the same day.\nThis should be monitored closely and all additions reviewed.'\n",
"severity": "Low",
"enabled": true,
"query": "(union isfuzzy=true\n(SecurityEvent\n| where EventID == 4720\n| where AccountType == \"User\"\n| project CreatedUserTime = TimeGenerated, CreatedUserEventID = EventID, CreatedUserActivity = Activity, Computer = toupper(Computer), \nCreatedUser = tolower(TargetAccount), CreatedUserSid = TargetSid, AccountUsedToCreateUser = strcat(SubjectAccount), SidofAccountUsedToCreateUser = SubjectUserSid\n),\n(WindowsEvent\n| where EventID == 4720\n| extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n| extend AccountType=case(EventData.SubjectUserName endswith \"$\" 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 TargetAccount = strcat(EventData.TargetDomainName,\"\\\\\", EventData.TargetUserName)\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), \nCreatedUser = tolower(TargetAccount), CreatedUserSid = TargetSid, AccountUsedToCreateUser = strcat(SubjectAccount), SidofAccountUsedToCreateUser = SubjectUserSid\n))\n| join ((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), \nGroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, 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 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), \nGroupSid = TargetSid, AccountThatAddedUser = SubjectAccount, SIDofAccountThatAddedUser = SubjectUserSid, CreatedUserSid = MemberSid)\n))\non CreatedUserSid\n//Create User first, then the add to the group.\n| project Computer, CreatedUserTime, CreatedUserEventID, CreatedUserActivity, CreatedUser, CreatedUserSid, GroupAddTime, GroupAddEventID, \nGroupAddActivity, AccountUsedToCreateUser, GroupName, GroupSid, AccountThatAddedUser, SIDofAccountThatAddedUser \n| extend timestamp = CreatedUserTime, AccountCustomEntity = CreatedUser, HostCustomEntity = Computer\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence",
"PrivilegeEscalation"
],
"techniques": [
"T1098",
"T1078"
],
"alertRuleTemplateName": "aa1eff90-29d4-49dc-a3ea-b65199f516db",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "FullName"
},
{
"columnName": "CreatedUserSid",
"identifier": "Sid"
}
],
"entityType": "Account"
},
{
"fieldMappings": [
{
"columnName": "HostCustomEntity",
"identifier": "FullName"
}
],
"entityType": "Host"
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserCreatedAddedToBuiltinAdmins_1d.yaml",
"templateVersion": "1.1.3"
}
}
]
}