KQL Search

id: f6a7b8c9-d0e1-4f2a-3b4c-5d6e7f8a9b0c
name: "SigninLogs — Concurrent Sessions from Multiple Countries (Same User)"
version: 1.0.0
kind: Scheduled
description: |
  Detects a single user successfully signing in from 2 or more distinct countries within a 30-minute window. Unlike ML-based impossible travel this is deterministic, requires no Entra ID P2, and catches concurrent attacker + victim sessions running in parallel from different geos. MITRE ATT&CK: T1078 (Valid Accounts).
severity: High
requiredDataConnectors:
  - connectorId: AzureActiveDirectory
    dataTypes:
      - SigninLogs
queryFrequency: PT1H
queryPeriod: PT1H
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
  - CredentialAccess
relevantTechniques:
  - T1078
query: |

    // ---- Network Allowlist (exclude trusted IPs / CIDR / ranges) --------------
    let _allow = materialize(union isfuzzy=true (print R="" | take 0), (_GetWatchlist('NetworkAllowlist') | project R = tostring(IPOrRange)) | where isnotempty(R));
    let _allowCIDR  = toscalar(_allow | where not(R matches regex @'^\d+\.\d+\.\d+\.\d+-\d+\.\d+\.\d+\.\d+$') | extend R = iff(R has '/', R, strcat(R, '/32')) | summarize make_list(R));
    let _allowRange = toscalar(_allow | where R matches regex @'^\d+\.\d+\.\d+\.\d+-\d+\.\d+\.\d+\.\d+$' | summarize make_list(R));
    let _ExcludeAllowlistedIPs = (T:(IPAddress:string)) {
        T
        | extend IPAddress = tostring(IPAddress)
        | where array_length(_allowCIDR) == 0 or isnull(ipv4_is_in_any_range(IPAddress, _allowCIDR)) or not(ipv4_is_in_any_range(IPAddress, _allowCIDR))
        | mv-apply _r = _allowRange to typeof(string) on (
            extend _lo = tostring(split(_r,'-')[0]), _hi = tostring(split(_r,'-')[1])
            | extend _inRange = ipv4_compare(IPAddress, _lo) >= 0 and ipv4_compare(IPAddress, _hi) <= 0
            | summarize _anyInRange = max(toint(_inRange)))
        | where isnull(_anyInRange) or _anyInRange == 0
        | project-away _anyInRange
    };
    // ---------------------------------------------------------------------------
    let lookback   = 1h;
    let maxWindowM = 30;
    SigninLogs
    | invoke _ExcludeAllowlistedIPs()
    | where TimeGenerated > ago(lookback)
    | where ResultType == "0"
    | where isnotempty(Location) and Location != "Unknown"
    | summarize
        UniqueCountries = dcount(Location),
        Countries       = make_set(Location, 10),
        SourceIPs       = make_set(IPAddress, 10),
        Apps            = make_set(AppDisplayName, 5),
        FirstSignIn     = min(TimeGenerated),
        LastSignIn      = max(TimeGenerated)
      by UserPrincipalName
    | where UniqueCountries >= 2
    | extend WindowMinutes = datetime_diff("minute", LastSignIn, FirstSignIn)
    | where WindowMinutes <= maxWindowM
    | project
        TimeGenerated = FirstSignIn,
        UserPrincipalName, UniqueCountries,
        Countries, SourceIPs, WindowMinutes,
        Apps, LastSignIn
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: UserPrincipalName
customDetails:
  UniqueCountries: UniqueCountries
  Countries: Countries
  WindowMinutes: WindowMinutes
alertDetailsOverride:
  alertDisplayNameFormat: "Concurrent Multi-Country Sessions — {{UserPrincipalName}} in {{UniqueCountries}} countries ({{WindowMinutes}}min)"
  alertDescriptionFormat: "User {{UserPrincipalName}} authenticated from {{UniqueCountries}} different countries within {{WindowMinutes}} minutes — possible concurrent attacker session."
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: PT1H
    matchingMethod: AllEntities
    groupByEntities:
  - Account