Detections/SecurityEvent/UserAccountEnabledDisabled_10m.yaml

id: 3d023f64-8225-41a2-9570-2bd7c2c4535e
name: User account enabled and disabled within 10 mins
description: |
  'Identifies when a user account is enabled and then disabled within 10 minutes. This can be an indication of compromise and an adversary attempting to hide in the noise.'
severity: Medium
requiredDataConnectors:
  - connectorId: SecurityEvents
    dataTypes:
      - SecurityEvent
  - connectorId: WindowsSecurityEvents
    dataTypes: 
      - SecurityEvents 
  - connectorId: WindowsForwardedEvents
    dataTypes: 
      - WindowsEvent  
queryFrequency: 1d
queryPeriod: 25h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Persistence
  - PrivilegeEscalation
relevantTechniques:
  - T1098
  - T1078
query: |
  let timeframe = 1d;
  let spanoftime = 10m;
  let threshold = 0;
    (union isfuzzy=true
      (SecurityEvent
      | where TimeGenerated > ago(timeframe+spanoftime)
      // A user account was enabled
      | where EventID == 4722
      | where AccountType =~ "User"
      | where TargetAccount !endswith "$"
      | project EnableTime = TimeGenerated, EnableEventID = EventID, EnableActivity = Activity, Computer = toupper(Computer), 
      TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, 
      AccountUsedToEnable = SubjectAccount, EnabledBySubjectUserName = SubjectUserName, EnabledBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToEnable = SubjectUserSid, UserPrincipalName
      ),
      (
      WindowsEvent
      | where TimeGenerated > ago(timeframe+spanoftime)
      // A user account was enabled
      | where EventID == 4722
      | extend SubjectUserSid = tostring(EventData.SubjectUserSid)
      | extend AccountType=case(EventData.SubjectUserName endswith "$" 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)
      | where TargetAccount !endswith "$"
      | extend Activity="4722 - A user account was enabled."
      | extend TargetUserName = tostring(EventData.TargetUserName), TargetDomainName = tostring(EventData.TargetDomainName) 
      | extend TargetSid = tostring(EventData.TargetSid)
      | extend UserPrincipalName = tostring(EventData.UserPrincipalName)
      | project EnableTime = TimeGenerated, EnableEventID = EventID, EnableActivity = Activity, Computer = toupper(Computer), 
      TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, 
      AccountUsedToEnable = SubjectAccount, EnabledBySubjectUserName = SubjectUserName, EnabledBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToEnable = SubjectUserSid, UserPrincipalName
      )
    )
  | join kind= inner (
    (union isfuzzy=true
      (SecurityEvent
      | where TimeGenerated > ago(timeframe)
      // A user account was disabled
      | where EventID == 4725
      | where AccountType =~ "User"
      | project DisableTime = TimeGenerated, DisableEventID = EventID, DisableActivity = Activity, Computer = toupper(Computer), 
      TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, 
      AccountUsedToDisable = SubjectAccount, DisabledBySubjectUserName = SubjectUserName, DisabledBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDisable = SubjectUserSid, UserPrincipalName
      ),
      (WindowsEvent
      | where TimeGenerated > ago(timeframe)
      // A user account was disabled
      | where EventID == 4725
      | extend SubjectUserSid = tostring(EventData.SubjectUserSid)
      | extend AccountType=case(EventData.SubjectUserName endswith "$" 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 TargetSid = tostring(EventData.TargetSid)
      | extend UserPrincipalName = tostring(EventData.UserPrincipalName)
      | extend Activity = "4725 - A user account was disabled."
      | project DisableTime = TimeGenerated, DisableEventID = EventID, DisableActivity = Activity, Computer = toupper(Computer), 
      TargetAccount = tolower(TargetAccount), TargetUserName, TargetDomainName, TargetSid, 
      AccountUsedToDisable = SubjectAccount, DisabledBySubjectUserName = SubjectUserName, DisabledBySubjectDomainName = SubjectDomainName, SIDofAccountUsedToDisable = SubjectUserSid, UserPrincipalName
      )
    )
  ) on Computer, TargetAccount
  | where DisableTime - EnableTime < spanoftime
  | extend TimeDelta = DisableTime - EnableTime
  | where tolong(TimeDelta) >= threshold
  | project TimeDelta, EnableTime, EnableEventID, EnableActivity, Computer, TargetAccount, TargetSid, TargetUserName, TargetDomainName, UserPrincipalName, 
  AccountUsedToEnable, SIDofAccountUsedToEnable, DisableTime, DisableEventID, DisableActivity, AccountUsedToDisable, SIDofAccountUsedToDisable, 
  EnabledBySubjectUserName, EnabledBySubjectDomainName, DisabledBySubjectUserName, DisabledBySubjectDomainName
  | extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
  | project-away DomainIndex
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AccountUsedToEnable
      - identifier: Name
        columnName: EnabledBySubjectUserName
      - identifier: NTDomain
        columnName: EnabledBySubjectDomainName
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AccountUsedToDisable
      - identifier: Name
        columnName: DisabledBySubjectUserName
      - identifier: NTDomain
        columnName: DisabledBySubjectDomainName
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: TargetAccount
      - identifier: Name
        columnName: TargetUserName
      - identifier: NTDomain
        columnName: TargetDomainName
  - entityType: Account
    fieldMappings:
      - identifier: Sid
        columnName: TargetSid
  - entityType: Host
    fieldMappings:
      - identifier: FullName
        columnName: Computer
      - identifier: HostName
        columnName: HostName
      - identifier: NTDomain
        columnName: HostNameDomain
version: 1.2.3
kind: Scheduled
metadata:
    source:
        kind: Community
    author:
        name: Microsoft Security Research
    support:
        tier: Community
    categories:
        domains: [ "Security - Others", "Identity" ]