SlackAudit - Unknown User Agent

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Id	3b11f06e-4afd-4ae6-8477-c61136619ac8
Rulename	SlackAudit - Unknown User Agent
Description	This query helps to detect who trying to connect to the Slack Workspace with unknown User Agent.
Severity	Low
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	SlackAuditAPI
Kind	Scheduled
Query frequency	24h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SlackAudit/Analytic Rules/SlackAuditUnknownUA.yaml
Version	1.0.1
Arm template	3b11f06e-4afd-4ae6-8477-c61136619ac8.json

KQL

let lbperiod = 14d;
let known_UAs = SlackAudit
| where TimeGenerated > ago(lbperiod)
| where isnotempty(UserAgentOriginal)
| summarize makeset(UserAgentOriginal);
SlackAudit
| where UserAgentOriginal !in (known_UAs)
| extend AccountCustomEntity = SrcUserName

YAML

description: |
    'This query helps to detect who trying to connect to the Slack Workspace with unknown User Agent.'
kind: Scheduled
queryFrequency: 24h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SlackAudit/Analytic Rules/SlackAuditUnknownUA.yaml
status: Available
triggerOperator: gt
severity: Low
relevantTechniques:
- T1071
triggerThreshold: 0
name: SlackAudit - Unknown User Agent
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
requiredDataConnectors:
- connectorId: SlackAuditAPI
  dataTypes:
  - SlackAudit_CL
id: 3b11f06e-4afd-4ae6-8477-c61136619ac8
queryPeriod: 14d
tactics:
- CommandAndControl
version: 1.0.1
query: |
  let lbperiod = 14d;
  let known_UAs = SlackAudit
  | where TimeGenerated > ago(lbperiod)
  | where isnotempty(UserAgentOriginal)
  | summarize makeset(UserAgentOriginal);
  SlackAudit
  | where UserAgentOriginal !in (known_UAs)
  | extend AccountCustomEntity = SrcUserName

ARM