Detection rules › Kusto
SlackAudit - Multiple failed logins for user
'Identifies multiple failed Slack logins for a user account within a short time window, which may indicate password guessing or brute-force activity.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access |
Rule body
id: 93a91c37-032c-4380-847c-957c001957ad
name: SlackAudit - Multiple failed logins for user
description: |
'Identifies multiple failed Slack logins for a user account within a short time window, which may indicate password
guessing or brute-force activity.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: SlackAuditAPI
dataTypes:
- SlackAudit_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- CredentialAccess
relevantTechniques:
- T1110
query: |
let threshold = 10;
SlackAudit
| where DvcAction in~ ('user_login_failed')
| summarize FailedLogins = count() by SrcUserName, bucket = bin(TimeGenerated, 5m)
| where FailedLogins > threshold
| extend AccountCustomEntity = SrcUserName
| project SrcUserName, bucket, FailedLogins, AccountCustomEntity
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
customDetails:
FailedLogins: FailedLogins
UserAccount: SrcUserName
TimeBucket: bucket
version: 1.0.1
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 10;
Stage 1: source
SlackAudit
Stage 2: where
| where DvcAction in~ ('user_login_failed')
Stage 3: summarize
| summarize FailedLogins = count() by SrcUserName, bucket = bin(TimeGenerated, 5m)
Stage 4: where
| where FailedLogins > threshold
Stage 5: extend
| extend AccountCustomEntity = SrcUserName
Stage 6: project
| project SrcUserName, bucket, FailedLogins, AccountCustomEntity
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
DvcAction | in |
| field:"DvcAction" kind:in value:"user_login_failed" |
FailedLogins | gt |
| field:"FailedLogins" kind:gt value:"10" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
AccountCustomEntity | project |
FailedLogins | project |
SrcUserName | project |
bucket | project |