KQL Search

// Looking for sign-ins of first-party apps that do not apply to a closed CA policies (e.g., to require MFA or device compliance to all users and all apps),
// enriched with details about delegated permissions, EntraOps classification, and known bypasses by EntraScopes.com or Microsoft documentation.
// The query needs to be executed in Microsoft Defender XDR Advanced Hunting (with integrated Sentinel workspace).
let EntraScopesBypasses = externaldata(AppID: string, ProtectionBypass: string, ResourcesAndScopes: string, CurrentState: string, Description: string)['https://entrascopes.com/bypasses.json'] with(format='singlejson')
    | mv-expand ResourcesAndScope = parse_json(ResourcesAndScopes)
    | mv-expand ResourceId = bag_keys(ResourcesAndScope)
    | extend Scopes = parse_json(ResourcesAndScope.[tostring(ResourceId)])
    | project ApplicationId = tostring(AppID), tostring(ResourceId), Scopes, ProtectionBypass, CurrentBypassState = CurrentState, BypassDescription = Description
    | mv-expand parse_json(ProtectionBypass)
    | extend CaControlValue = case(
        ProtectionBypass == "CompliantDevice", "RequireCompliantDevice",
        ProtectionBypass == "Multifactor", "Mfa",
        ProtectionBypass
    )    
    | summarize KnownBypassControls = array_sort_asc(make_set(CaControlValue)), KnownBypassAppRoles = array_sort_asc(make_set(Scopes)) by ApplicationId, ResourceId, CurrentBypassState, BypassDescription
    ;
let EntraScopes = externaldata(apps: dynamic)['https://entrascopes.com/firstpartyscopes.json'] with(format='singlejson')
    | mv-expand ApplicationId = bag_keys(apps)
    | extend ApplicationId = tostring(ApplicationId)
    | extend IsFoci = tobool(apps[ApplicationId].foci)
    | project ApplicationId, IsFoci;
// The following bypasses are by design and documented: https://learn.microsoft.com/en-us/entra/identity/conditional-access/concept-conditional-access-cloud-apps#conditional-access-behavior-when-an-all-resources-policy-has-an-app-exclusion
let KnownBypassForNativeSpaByDesign = dynamic(['email','openid','offline_access','profile','User.Read','People.Read']); 
let KnownBypassForConfidentialClientByDesign = dynamic(['email', 'offline_access', 'openid', 'profile', 'User.Read', 'User.Read.All', 'User.ReadBasic.All', 'People.Read', 'People.Read.All', 'GroupMember.Read.All', 'Member.Read.Hidden']);
// Define which CA controls should be included
let IncludedControls = dynamic(['Mfa','RequireCompliantDevice']); // For example 'Mfa', 'RequireCompliantDevice' or 'Block'
// Define exclusions for CA policies (by policy name) that should not be considered
let ExcludedPolicies = dynamic(['']);
// Define which applications have been explicitly excluded from Closed CA Policies (All Cloud Apps) and assigned in Excluded Cloud Apps (e.g., Windows 365 App/Portal for device compliance bypass)
let ExcludedAppId = dynamic(['']);
// Lookup EntraOps classification
let SensitiveMsGraphPermissions = externaldata(EAMTierLevelName: string, Category: string, AppRoleDisplayName: string)["https://raw.githubusercontent.com/Cloud-Architekt/AzurePrivilegedIAM/main/Classification/Classification_AppRoles.json"] with(format='multijson');
AADSignInEventsBeta
| where IsGuestUser == "0" and ErrorCode == "0"
| where ApplicationId !in (ExcludedAppId)
| mv-apply BypassPolicy = parse_json(ConditionalAccessPolicies) to typeof(dynamic) on (
    where (
    BypassPolicy.includeRulesSatisfied contains "allApps" and BypassPolicy.displayName !in~ (ExcludedPolicies)
    and ((BypassPolicy.excludeRulesSatisfied contains "appId" and (parse_json(BypassPolicy)["result"] == "notApplied")) or parse_json(BypassPolicy)["result"] == "failure"))
    and BypassPolicy.enforcedGrantControls[0] in (IncludedControls)
)
| extend BypassPolicyName = tostring(parse_json(BypassPolicy)["displayName"])
| extend BypassPolicyControl = parse_json(BypassPolicy)["enforcedGrantControls"]
// Filter for Conditional Access Policies which includes user and not applied or failed policy status on successful sign-in
| where parse_json(BypassPolicy)["includeRulesSatisfied"] contains "userId" or parse_json(BypassPolicy)["includeRulesSatisfied"] contains "allUsers"
| where parse_json(BypassPolicy)["excludeRulesSatisfied"] contains "appId" or parse_json(BypassPolicy)["result"] == "failure"
// Filter and enrichment to EntraScopes, remove the line if you like to see also non-first party apps or any app which is not listed in EntraScopes
| join kind = inner (EntraScopes ) on ApplicationId
| join kind = leftouter (
    union SigninLogs, AADNonInteractiveUserSignInLogs
    | extend AuthProcessDetails = replace_string(AuthenticationProcessingDetails, " " , "")
    | extend AuthProcessDetails = replace_string(AuthProcessDetails, "\r\n" , "")
    // Used client credentials as indicator for Confidential Client
    | extend IsConfidentialClient = iff(ClientCredentialType != "none" or isnotempty(ClientCredentialType), true, false)
    | parse AuthProcessDetails with * "OauthScopeInfo\",\"value\":\"" OauthScopeInfo "\"}" *
    | extend OAuthDelegatedScope = replace_string(OauthScopeInfo, '\\', '')
    | mv-expand parse_json(OAuthDelegatedScope)
    | extend AppRoleDisplayName = tostring(OAuthDelegatedScope)   
    | join kind=leftouter(
            SensitiveMsGraphPermissions
            | project AppRolePermissionTierLevel = tostring(EAMTierLevelName), AppRoleCategory = tostring(Category), tostring(AppRoleDisplayName)
    ) on AppRoleDisplayName
    | extend OAuthDelegatedScope = case(
        isnotempty(AppRoleDisplayName),
        bag_pack_columns(AppRoleDisplayName, AppRolePermissionTierLevel, AppRoleCategory),
        ''
    )
    | extend AadMsGraphAppRoles = iff(ResourceDisplayName == "Microsoft Graph" or ResourceDisplayName == "Windows Azure Active Directory", AppRoleDisplayName, "")
    | summarize OAuthDelegatedScopes = make_set(OAuthDelegatedScope), AadMsGraphAppRoles = make_set(AadMsGraphAppRoles), AppRoles = make_set(AppRoleDisplayName) by CorrelationId, RequestId = OriginalRequestId, UniqueTokenIdentifier, IsConfidentialClient
) on CorrelationId, RequestId
| extend AffectedCaPolicy = bag_pack_columns(BypassPolicy)
| join kind = leftouter ( EntraScopesBypasses ) on ApplicationId, ResourceId
| extend MatchedSignInBypassAppRoles = set_intersect(AppRoles, KnownBypassAppRoles)
| extend MatchedSignInBypassAppRolesByDesign = iff(
    IsConfidentialClient == true, set_intersect(AadMsGraphAppRoles, KnownBypassForConfidentialClientByDesign),
    set_intersect(AadMsGraphAppRoles, KnownBypassForNativeSpaByDesign)
    )
| extend MatchedSignInBypassControl = set_intersect(BypassPolicyControl, KnownBypassControls)
| extend MatchedKnownBypass = case(
    array_length(AppRoles) == array_length(MatchedSignInBypassAppRoles), "Full - listed in Entrascopes.com",
    isnotempty(MatchedSignInBypassAppRoles), "Partial - listed in Entrascopes.com",
    array_length(AppRoles) == array_length(MatchedSignInBypassAppRolesByDesign), "Full - Excluded by Microsoft as low privilege scopes from policy enforcement",
    isnotempty(MatchedSignInBypassControl), "Partial - Excluded by Microsoft as low privilege scopes from policy enforcement",
    isempty(OAuthDelegatedScopes[0]), "None - Bypass does not include delegated API permissions",
    isnotempty(OAuthDelegatedScopes), "None - Bypass includes delegated API permissions",
    "None"
)
| extend Resource = bag_pack_columns(ResourceDisplayName, ResourceId, ResourceTenantId, OAuthDelegatedScopes)
| extend MatchedCriterias = bag_pack_columns(MatchedSignInBypassAppRoles, MatchedSignInBypassControl)
| extend MatchedCriterias = case(
    MatchedKnownBypass contains "listed in Entrascopes.com", bag_pack_columns(MatchedSignInBypassAppRoles, MatchedSignInBypassControl),
    MatchedKnownBypass contains "Excluded by Microsoft", bag_pack_columns(MatchedSignInBypassAppRolesByDesign, BypassPolicyControl),
    ''
)
| summarize SignInStartTime = min(Timestamp), SignInEndTime = max(Timestamp), MatchedCriterias = make_set(MatchedCriterias), Resources = make_set(Resource), AffectedCaPolicies = make_set(AffectedCaPolicy), BypassControl = array_sort_asc(make_set(BypassPolicyControl)), KnownBypassControls = make_set(KnownBypassControls), NumberOfSignIns = dcount(CorrelationId), AffectedRequestIds = make_set(RequestId), AffectedUniqueTokenIds = make_set(UniqueTokenIdentifier)
            by Application, ApplicationId, CurrentBypassState, IsFoci, IsConfidentialClient, MatchedKnownBypass, BypassDescription
| project-reorder Application, ApplicationId, MatchedKnownBypass, MatchedCriterias, CurrentBypassState, BypassDescription, IsFoci, IsConfidentialClient, Resources, NumberOfSignIns, BypassControl, KnownBypassControls, AffectedCaPolicies, AffectedRequestIds, AffectedUniqueTokenIds
| sort by Application asc