User account created and deleted within 10 mins
| Id | 4b93c5af-d20b-4236-b696-a28b8c51407f |
| Rulename | User account created and deleted within 10 mins |
| Description | Identifies when a user account is created and then deleted within 10 minutes. This can be an indication of compromise and an adversary attempting to hide in the noise. |
| Severity | Medium |
| Tactics | Persistence PrivilegeEscalation |
| Techniques | T1098 T1078 |
| Required data connectors | SecurityEvents WindowsForwardedEvents WindowsSecurityEvents |
| Kind | Scheduled |
| Query frequency | 1d |
| Query period | 25h |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserAccountCreatedDeleted_10m.yaml |
| Version | 1.2.1 |
| Arm template | 4b93c5af-d20b-4236-b696-a28b8c51407f.json |
let timeframe = 1d;
let spanoftime = 10m;
let threshold = 0;
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated > ago(timeframe+spanoftime)
// A user account was created
| where EventID == 4720
| where AccountType =~ "User"
| project creationTime = TimeGenerated, CreateEventID = EventID, CreateActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToCreate = SubjectAccount, CreatedBySubjectUserName = SubjectUserName, CreatedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToCreate = SubjectUserSid, UserPrincipalName
),
(
WindowsEvent
| where TimeGenerated > ago(timeframe+spanoftime)
// A user account was created
| 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 TargetSid = tostring(EventData.TargetSid)
| extend UserPrincipalName = tostring(EventData.UserPrincipalName)
| extend Activity = "4720 - A user account was created."
| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName)
| project creationTime = TimeGenerated, CreateEventID = EventID, CreateActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToCreate = SubjectAccount, CreatedBySubjectUserName = SubjectUserName, CreatedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToCreate = SubjectUserSid, UserPrincipalName
)
)
| join kind = inner
(
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated > ago(timeframe)
// A user account was deleted
| where EventID == 4726
| where AccountType == "User"
| project deletionTime = TimeGenerated, DeleteEventID = EventID, DeleteActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToDelete = SubjectAccount, DeletedBySubjectUserName = SubjectUserName, DeletedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDelete = SubjectUserSid, UserPrincipalName
),
(WindowsEvent
| where TimeGenerated > ago(timeframe)
// A user account was deleted
| where EventID == 4726
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend AccountType=case(SubjectAccount endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)
| extend TargetSid = tostring(EventData.TargetSid)
| extend UserPrincipalName = tostring(EventData.UserPrincipalName)
| extend Activity = "4726 - A user account was deleted."
| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName)
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| project deletionTime = TimeGenerated, DeleteEventID = EventID, DeleteActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToDelete = SubjectAccount, DeletedBySubjectUserName = SubjectUserName, DeletedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDelete = SubjectUserSid, UserPrincipalName
)
)
) on Computer, TargetAccount
| where deletionTime - creationTime < spanoftime
| extend TimeDelta = deletionTime - creationTime
| where tolong(TimeDelta) >= threshold
| project TimeDelta, creationTime, CreateEventID, CreateActivity, Computer, TargetAccount, TargetSid, UserPrincipalName, AccountUsedToCreate, SIDofAccountUsedToCreate,
deletionTime, DeleteEventID, DeleteActivity, AccountUsedToDelete, SIDofAccountUsedToDelete, TargetUserName, TargetDomainName,
CreatedBySubjectUserName, CreatedBySubjectDomainName, DeletedBySubjectUserName, DeletedBySubjectDomainName
| extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
| project-away DomainIndex
relevantTechniques:
- T1098
- T1078
id: 4b93c5af-d20b-4236-b696-a28b8c51407f
queryPeriod: 25h
tactics:
- Persistence
- PrivilegeEscalation
triggerThreshold: 0
version: 1.2.1
queryFrequency: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/UserAccountCreatedDeleted_10m.yaml
name: User account created and deleted within 10 mins
requiredDataConnectors:
- dataTypes:
- SecurityEvent
connectorId: SecurityEvents
- dataTypes:
- SecurityEvent
connectorId: WindowsSecurityEvents
- dataTypes:
- WindowsEvent
connectorId: WindowsForwardedEvents
severity: Medium
triggerOperator: gt
metadata:
categories:
domains:
- Security - Others
- Identity
author:
name: Microsoft Security Research
source:
kind: Community
support:
tier: Community
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountUsedToCreate
identifier: FullName
- columnName: CreatedBySubjectUserName
identifier: Name
- columnName: CreatedBySubjectDomainName
identifier: NTDomain
- entityType: Account
fieldMappings:
- columnName: AccountUsedToDelete
identifier: FullName
- columnName: DeletedBySubjectUserName
identifier: Name
- columnName: DeletedBySubjectDomainName
identifier: NTDomain
- entityType: Account
fieldMappings:
- columnName: TargetAccount
identifier: FullName
- columnName: TargetUserName
identifier: Name
- columnName: TargetDomainName
identifier: NTDomain
- entityType: Account
fieldMappings:
- columnName: TargetSid
identifier: Sid
- entityType: Host
fieldMappings:
- columnName: Computer
identifier: FullName
- columnName: HostName
identifier: HostName
- columnName: HostNameDomain
identifier: NTDomain
query: |
let timeframe = 1d;
let spanoftime = 10m;
let threshold = 0;
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated > ago(timeframe+spanoftime)
// A user account was created
| where EventID == 4720
| where AccountType =~ "User"
| project creationTime = TimeGenerated, CreateEventID = EventID, CreateActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToCreate = SubjectAccount, CreatedBySubjectUserName = SubjectUserName, CreatedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToCreate = SubjectUserSid, UserPrincipalName
),
(
WindowsEvent
| where TimeGenerated > ago(timeframe+spanoftime)
// A user account was created
| 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 TargetSid = tostring(EventData.TargetSid)
| extend UserPrincipalName = tostring(EventData.UserPrincipalName)
| extend Activity = "4720 - A user account was created."
| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName)
| project creationTime = TimeGenerated, CreateEventID = EventID, CreateActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToCreate = SubjectAccount, CreatedBySubjectUserName = SubjectUserName, CreatedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToCreate = SubjectUserSid, UserPrincipalName
)
)
| join kind = inner
(
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated > ago(timeframe)
// A user account was deleted
| where EventID == 4726
| where AccountType == "User"
| project deletionTime = TimeGenerated, DeleteEventID = EventID, DeleteActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToDelete = SubjectAccount, DeletedBySubjectUserName = SubjectUserName, DeletedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDelete = SubjectUserSid, UserPrincipalName
),
(WindowsEvent
| where TimeGenerated > ago(timeframe)
// A user account was deleted
| where EventID == 4726
| extend SubjectUserSid = tostring(EventData.SubjectUserSid)
| extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend AccountType=case(SubjectAccount endswith "$" or SubjectUserSid in ("S-1-5-18", "S-1-5-19", "S-1-5-20"), "Machine", isempty(SubjectUserSid), "", "User")
| where AccountType == "User"
| extend SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)
| extend TargetSid = tostring(EventData.TargetSid)
| extend UserPrincipalName = tostring(EventData.UserPrincipalName)
| extend Activity = "4726 - A user account was deleted."
| extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName)
| extend TargetAccount = strcat(EventData.TargetDomainName,"\\", EventData.TargetUserName)
| project deletionTime = TimeGenerated, DeleteEventID = EventID, DeleteActivity = Activity, Computer = toupper(Computer),
TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid,
AccountUsedToDelete = SubjectAccount, DeletedBySubjectUserName = SubjectUserName, DeletedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDelete = SubjectUserSid, UserPrincipalName
)
)
) on Computer, TargetAccount
| where deletionTime - creationTime < spanoftime
| extend TimeDelta = deletionTime - creationTime
| where tolong(TimeDelta) >= threshold
| project TimeDelta, creationTime, CreateEventID, CreateActivity, Computer, TargetAccount, TargetSid, UserPrincipalName, AccountUsedToCreate, SIDofAccountUsedToCreate,
deletionTime, DeleteEventID, DeleteActivity, AccountUsedToDelete, SIDofAccountUsedToDelete, TargetUserName, TargetDomainName,
CreatedBySubjectUserName, CreatedBySubjectDomainName, DeletedBySubjectUserName, DeletedBySubjectDomainName
| extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
| project-away DomainIndex
description: |
'Identifies when a user account is created and then deleted within 10 minutes. This can be an indication of compromise and
an adversary attempting to hide in the noise.'
kind: Scheduled
{
"$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/4b93c5af-d20b-4236-b696-a28b8c51407f')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4b93c5af-d20b-4236-b696-a28b8c51407f')]",
"properties": {
"alertRuleTemplateName": "4b93c5af-d20b-4236-b696-a28b8c51407f",
"customDetails": null,
"description": "'Identifies when a user account is created and then deleted within 10 minutes. This can be an indication of compromise and\nan adversary attempting to hide in the noise.'\n",
"displayName": "User account created and deleted within 10 mins",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountUsedToCreate",
"identifier": "FullName"
},
{
"columnName": "CreatedBySubjectUserName",
"identifier": "Name"
},
{
"columnName": "CreatedBySubjectDomainName",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountUsedToDelete",
"identifier": "FullName"
},
{
"columnName": "DeletedBySubjectUserName",
"identifier": "Name"
},
{
"columnName": "DeletedBySubjectDomainName",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "TargetAccount",
"identifier": "FullName"
},
{
"columnName": "TargetUserName",
"identifier": "Name"
},
{
"columnName": "TargetDomainName",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "TargetSid",
"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/UserAccountCreatedDeleted_10m.yaml",
"query": "let timeframe = 1d;\nlet spanoftime = 10m;\nlet threshold = 0;\n(union isfuzzy=true\n (SecurityEvent\n | where TimeGenerated > ago(timeframe+spanoftime)\n // A user account was created\n | where EventID == 4720\n | where AccountType =~ \"User\"\n | project creationTime = TimeGenerated, CreateEventID = EventID, CreateActivity = Activity, Computer = toupper(Computer), \n TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, \n AccountUsedToCreate = SubjectAccount, CreatedBySubjectUserName = SubjectUserName, CreatedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToCreate = SubjectUserSid, UserPrincipalName\n ),\n (\n WindowsEvent\n | where TimeGenerated > ago(timeframe+spanoftime)\n // A user account was created\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 TargetSid = tostring(EventData.TargetSid)\n | extend UserPrincipalName = tostring(EventData.UserPrincipalName)\n | extend Activity = \"4720 - A user account was created.\"\n | extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName) \n | project creationTime = TimeGenerated, CreateEventID = EventID, CreateActivity = Activity, Computer = toupper(Computer), \n TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, \n AccountUsedToCreate = SubjectAccount, CreatedBySubjectUserName = SubjectUserName, CreatedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToCreate = SubjectUserSid, UserPrincipalName\n )\n )\n| join kind = inner \n(\n (union isfuzzy=true\n (SecurityEvent\n | where TimeGenerated > ago(timeframe)\n // A user account was deleted\n | where EventID == 4726\n | where AccountType == \"User\"\n | project deletionTime = TimeGenerated, DeleteEventID = EventID, DeleteActivity = Activity, Computer = toupper(Computer), \n TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, \n AccountUsedToDelete = SubjectAccount, DeletedBySubjectUserName = SubjectUserName, DeletedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDelete = SubjectUserSid, UserPrincipalName\n ),\n (WindowsEvent\n | where TimeGenerated > ago(timeframe)\n // A user account was deleted\n | where EventID == 4726\n | extend SubjectUserSid = tostring(EventData.SubjectUserSid)\n | extend SubjectAccount = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n | extend AccountType=case(SubjectAccount 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 SubjectDomainName = tostring(EventData.SubjectDomainName), SubjectUserName = tostring(EventData.SubjectUserName)\n | extend TargetSid = tostring(EventData.TargetSid)\n | extend UserPrincipalName = tostring(EventData.UserPrincipalName)\n | extend Activity = \"4726 - A user account was deleted.\"\n | extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName) \n | extend TargetAccount = strcat(EventData.TargetDomainName,\"\\\\\", EventData.TargetUserName)\n | project deletionTime = TimeGenerated, DeleteEventID = EventID, DeleteActivity = Activity, Computer = toupper(Computer), \n TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, \n AccountUsedToDelete = SubjectAccount, DeletedBySubjectUserName = SubjectUserName, DeletedBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDelete = SubjectUserSid, UserPrincipalName\n )\n )\n) on Computer, TargetAccount\n| where deletionTime - creationTime < spanoftime\n| extend TimeDelta = deletionTime - creationTime\n| where tolong(TimeDelta) >= threshold\n| project TimeDelta, creationTime, CreateEventID, CreateActivity, Computer, TargetAccount, TargetSid, UserPrincipalName, AccountUsedToCreate, SIDofAccountUsedToCreate,\ndeletionTime, DeleteEventID, DeleteActivity, AccountUsedToDelete, SIDofAccountUsedToDelete, TargetUserName, TargetDomainName, \nCreatedBySubjectUserName, CreatedBySubjectDomainName, DeletedBySubjectUserName, DeletedBySubjectDomainName\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": "PT25H",
"severity": "Medium",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence",
"PrivilegeEscalation"
],
"techniques": [
"T1078",
"T1098"
],
"templateVersion": "1.2.1",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}