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StealthTalk - Password brute force
Description
Identifies a brute-force authentication attempt against a single StealthTalk user account. The StealthTalk anti-brute-force subsystem emits a `MultiFailLogin` event when consecutive failed attempts trigger an automatic account lockout. This rule fires when the reported number of consecutive failures is 9 or more, distinguishing a credential-guessing attack from an isolated user error. The lockout duration (`LoginBlockingSeconds`) is surfaced as a custom detail so the SOC analyst can prioritise by attack persistence.
- Rule type
- Scheduled
- Version
- 1.0.0
- Declared status
- Available
- Query frequency
- 15m
- Query period
- 5h
- Trigger
- gt 0
Declared MITRE coverage
Declared sources
Metadata from the source file. No dependencies inferred from KQL.
Connectors
Data types
KQL query
Original query, unchanged.
let LookbackPeriod = 5h;
let MinFailedAttempts = 9;
StealthTalkAnomalousAuth_CL
| where TimeGenerated >= ago(LookbackPeriod)
| where EventType == "MultiFailLogin"
| where PassedAttempts >= MinFailedAttempts
| extend
BlockingMinutes = LoginBlockingSeconds / 60,
AlertName = "PasswordBruteForce",
AlertDetails = strcat(
"User ", UserId,
" had ", PassedAttempts, " consecutive failed login attempts",
" on device ", DeviceId, ".",
" Account blocked for ", LoginBlockingSeconds, " seconds",
" (", LoginBlockingSeconds / 60, " min)."
)
| project
TimeGenerated, UserId, DeviceId,
PassedAttempts, LoginBlockingSeconds, BlockingMinutes,
AppVersion, RawEventId, AlertName, AlertDetails
Declared entities
Related content
Links established from declared identifiers and solution manifests.
Source provenance
GitHubDisplayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.
- Commit
629d1d3↗- Source identifier
b8e5f3a2-9c4d-4d1f-8a7b-3c2d1e0f9a8b
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC