Description
This query detects a password spraying attack, where a single machine has performed a large number of failed login attempts, with a large number of different accounts.
For each account, the attacker uses just a few attempts to prevent account lockout. This query uses the DeviceLogonEvents per machine to detect a password spraying attacks.
The machine against which the password spraying is performed (can be DC, a server or even an endpoint) needs to be enrolled in Microsoft Defender for Endpoint.
- Type de règle
- Scheduled
- Version
- 1.0.1
- Statut déclaré
- Available
- Fréquence
- 1d
- Période analysée
- 1d
- Déclenchement
- gt 0
Couverture MITRE déclarée
Sources déclarées
Métadonnées du fichier source. Aucune dépendance déduite du KQL.
Connecteurs
Types de données
Requête KQL
Requête originale, sans modification.
let thresholdForUniqueFailedAccounts = 20;
let upperBoundOfFailedLogonsPerAccount = 10;
let ratioSuccessFailedLogons = 0.5;
let timeframe = 1d;
DeviceLogonEvents
| where Timestamp >= ago(timeframe)
| where LogonType != "Unlock" and ActionType in ("LogonSuccess", "LogonFailed")
| where not(isempty( RemoteIP) and isempty( RemoteDeviceName))
| extend LocalLogon=parse_json(AdditionalFields)
| where RemoteIPType != "Loopback"
| summarize SuccessLogonCount = countif(ActionType == "LogonSuccess"), FailedLogonCount = countif(ActionType == "LogonFailed"),
UniqueAccountFailedLogons=dcountif(AccountName, ActionType == "LogonFailed"), FirstFailed=minif(Timestamp, ActionType == "LogonFailed"),
LastFailed=maxif(Timestamp, ActionType == "LogonFailed"), LastTimestamp=arg_max(Timestamp, tostring(ReportId)) by RemoteIP, DeviceName // RemoteIP is the source of the logon attempt.
| project-rename IPAddress=RemoteIP
| where UniqueAccountFailedLogons > thresholdForUniqueFailedAccounts and SuccessLogonCount*ratioSuccessFailedLogons < FailedLogonCount and UniqueAccountFailedLogons*upperBoundOfFailedLogonsPerAccount > FailedLogonCount
Entités déclarées
Contenus associés
Liens établis à partir des identifiants déclarés et des manifests des solutions.
Traçabilité de la source
GitHubLes valeurs affichées proviennent des fichiers du dépôt Azure/Azure-Sentinel. Elles décrivent le modèle publié, pas la configuration de votre workspace.
- Commit
7ca9800↗- Identifiant source
e00f72ab-fea1-4a31-9ecc-eea6397cd38d
GSTEP / SUIVI DU CATALOGUE
Ajouté au catalogue : 16 sept. 2026 · 05:49 UTC
Dernier changement observé : 16 sept. 2026 · 05:49 UTC