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kqlMITfrom Azure/Azure-Sentinel

Authentication Attempt from New Country

Detects when there is a login attempt from a country that has not seen a successful login in the previous 14 days. Threat actors may attempt to authenticate with credentials from compromised accounts - monitoring attempts from anomalous locations may help identify these attempts. Authentication attempts should be investigated to ensure the activity was legitimate and if there is other similar activity. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins

Quality
100
FP risk
—
Forks
0
Views
0
ATT&CK techniques
T1078.004
Rule sourceDetections/SigninLogs/AuthenticationAttemptfromNewCountry.yaml
let CombinedSignInLogs = union isfuzzy=True AADNonInteractiveUserSignInLogs, SigninLogs;
  // Combine AADNonInteractiveUserSignInLogs and SigninLogs into a single table
  // Fetch Azure IP address ranges data from a JSON file hosted on GitHub
  let AzureRanges = externaldata(changeNumber: string, cloud: string, values: dynamic)
  ["https://raw.githubusercontent.com/microsoft/mstic/master/PublicFeeds/MSFTIPRanges/ServiceTags_Public.json"] with(format='multijson')
  // Load Azure IP address ranges from the JSON file hosted on GitHub
  | mv-expand values
  // Expand the values column into separate rows
  | extend Name = values.name, AddressPrefixes = tostring(values.properties.addressPrefixes);
  // Create additional columns for the name and address prefixes
  // Identify known locations to be excluded from analysis
  let ExcludedKnownLocations = CombinedSignInLogs
  // Filter the combined logs based on the specified time range
  | where TimeGenerated between (ago(14d)..ago(1d))
  // Filter by specific ResultType
  | where ResultType == 0
  // Summarize the logs by location
  | summarize by Location;
  // Find sign-in locations matching specific criteria
  let MatchedLocations = materialize(CombinedSignInLogs
  // Filter the combined logs based on the specified time range
  | where TimeGenerated > ago(1d)
  // Exclude specific ResultTypes
  | where ResultType !in (50126, 50053, 50074, 70044)
  // Exclude known locations
  | where Location !in (ExcludedKnownLocations));
  // Match IP addresses of matched locations with Azure IP address ranges
  let MatchedIPs = MatchedLocations
  // Use the 'ipv4_lookup' function to match IP addresses with Azure IP address ranges
  | evaluate ipv4_lookup(AzureRanges, IPAddress, AddressPrefixes)
  // Project only the IPAddress column
  | project IPAddress;
  // Exclude IP addresses that are already matched with Azure IP address ranges
  let MaxSetSize = 5; // Set the maximum size limit for make_set
  let ExcludedIPs = MatchedLocations
  // Filter out IP addresses that are already matched
  | where not (IPAddress in (MatchedIPs))
  // Exclude empty or null Location values
  | where isnotempty(Location)
  // Handle dynamic and string column values for LocationDetails and DeviceDetail
  | extend LocationDetails_dynamic = column_ifexists("LocationDetails_dynamic", "")
  | extend DeviceDetail_dynamic = column_ifexists("DeviceDetail_dynamic", "")
  | extend LocationDetails = iif(isnotempty(LocationDetails_dynamic), LocationDetails_dynamic, parse_json(LocationDetails_string))
  | extend DeviceDetail = iif(isnotempty(DeviceDetail_dynamic), DeviceDetail_dynamic, parse_json(DeviceDetail_string))
  // Extract location details (city and state)
  | extend City = tostring(LocationDetails.city)
  | extend State = tostring(LocationDetails.state)
  | extend Place = strcat(City, " - ", State)
  | extend DeviceId = tostring(DeviceDetail.deviceId)
  | extend Result = strcat(tostring(ResultType), " - ", ResultDescription)
  // Summarize the data based on UserPrincipalName, Location, and Category
  | summarize FirstSeen=min(TimeGenerated), LastSeen=max(TimeGenerated),
  make_set(Result, MaxSetSize), make_set(IPAddress, MaxSetSize),
  make_set(UserAgent, MaxSetSize), make_set(Place, MaxSetSize),
  make_set(DeviceId, MaxSetSize) by UserPrincipalName, Location, Category
  // Extract the username prefix and suffix from UserPrincipalName
  | extend Name = tostring(split(UserPrincipalName,'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName,'@',1)[0]);
  ExcludedIPs // Output the final result set
  | extend IP = set_IPAddress[0]
Authentication Attempt from New Country · KQL rule | DetectionLint