SuccessThenFail_DiffIP_SameUserandApp.yaml

id: 02ef8d7e-fc3a-4d86-a457-650fa571d8d2
name: Successful logon from IP and failure from a different IP
description: |
  'Identifies when a user account successfully logs onto an Azure App from one IP and within 10 mins failed to logon to the same App via a different IP (may indicate a malicious attempt at password guessing with known account). UEBA added for context.'
severity: Medium 
requiredDataConnectors:
  - connectorId: AzureActiveDirectory
    dataTypes:
      - SigninLogs
  - connectorId: AzureActiveDirectory
    dataTypes:
      - AADNonInteractiveUserSignInLogs
  - connectorId: BehaviorAnalytics
    dataTypes:
      - BehaviorAnalytics
  - connectorId: BehaviorAnalytics
    dataTypes:
      - IdentityInfo
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
status: Available
tactics:
  - CredentialAccess
  - InitialAccess
relevantTechniques:
  - T1110
  - T1078
query: |
  let riskScoreCutoff = 20; //Adjust this based on volume of results
  let logonDiff = 10m; let aadFunc = (tableName:string){ table(tableName)
  | where ResultType == "0"
  | where AppDisplayName !in ("Office 365 Exchange Online", "Skype for Business Online") // To remove false-positives, add more Apps to this array
  // ---------- Fix for SuccessBlock to also consider IPv6
  | extend SuccessIPv6Block = strcat(split(IPAddress, ":")[0], ":", split(IPAddress, ":")[1], ":", split(IPAddress, ":")[2], ":", split(IPAddress, ":")[3])
  | extend SuccessIPv4Block = strcat(split(IPAddress, ".")[0], ".", split(IPAddress, ".")[1])
  // ------------------
  | project SuccessLogonTime = TimeGenerated, UserPrincipalName, SuccessIPAddress = IPAddress, SuccessLocation = Location, AppDisplayName, SuccessIPBlock = iff(IPAddress contains ":", strcat(split(IPAddress, ":")[0], ":", split(IPAddress, ":")[1]), strcat(split(IPAddress, ".")[0], ".", split(IPAddress, ".")[1])), Type
  | join kind= inner (
      table(tableName)
      | where ResultType !in ("0", "50140")
      | where ResultDescription !~ "Other"
      | where AppDisplayName !in ("Office 365 Exchange Online", "Skype for Business Online")
      | project FailedLogonTime = TimeGenerated, UserPrincipalName, FailedIPAddress = IPAddress, FailedLocation = Location, AppDisplayName, ResultType, ResultDescription, Type 
  ) on UserPrincipalName, AppDisplayName
  | where SuccessLogonTime < FailedLogonTime and FailedLogonTime - SuccessLogonTime <= logonDiff and FailedIPAddress !startswith SuccessIPBlock
  | summarize FailedLogonTime = max(FailedLogonTime), SuccessLogonTime = max(SuccessLogonTime) by UserPrincipalName, SuccessIPAddress, SuccessLocation, AppDisplayName, FailedIPAddress, FailedLocation, ResultType, ResultDescription, Type
  | extend timestamp = SuccessLogonTime
  | extend UserPrincipalName = tolower(UserPrincipalName)};
  let aadSignin = aadFunc("SigninLogs");
  let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
  union isfuzzy=true aadSignin, aadNonInt
  | extend Name = tostring(split(UserPrincipalName,'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName,'@',1)[0])
  // UEBA context below - make sure you have these 2 datatypes, otherwise the query will not work. If so, comment all that is below.
  | join kind=leftouter (
      IdentityInfo
      | summarize LatestReportTime = arg_max(TimeGenerated, *) by AccountUPN
      | project AccountUPN, Tags, JobTitle, GroupMembership, AssignedRoles, UserType, IsAccountEnabled
      | summarize
          Tags = make_set(Tags, 1000),
          GroupMembership = make_set(GroupMembership, 1000),
          AssignedRoles = make_set(AssignedRoles, 1000),
          UserType = make_set(UserType, 1000),
          UserAccountControl = make_set(UserType, 1000)
      by AccountUPN
      | extend UserPrincipalName=tolower(AccountUPN)
  ) on UserPrincipalName
  | join kind=leftouter (
      BehaviorAnalytics
      | where ActivityType in ("FailedLogOn", "LogOn")
      | where isnotempty(SourceIPAddress)
      | project UsersInsights, DevicesInsights, ActivityInsights, InvestigationPriority, SourceIPAddress
      | project-rename FailedIPAddress = SourceIPAddress
      | summarize
          UsersInsights = make_set(UsersInsights, 1000),
          DevicesInsights = make_set(DevicesInsights, 1000),
          IPInvestigationPriority = sum(InvestigationPriority)
      by FailedIPAddress)
  on FailedIPAddress
  | extend UEBARiskScore = IPInvestigationPriority
  | where  UEBARiskScore > riskScoreCutoff
  | sort by UEBARiskScore desc 
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: UserPrincipalName
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SuccessIPAddress
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: FailedIPAddress
version: 2.1.9
kind: Scheduled