Cisco WSA - Multiple attempts to download unwanted file

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Id	46b6c6fc-2c1a-4270-be10-9d444d83f027
Rulename	Cisco WSA - Multiple attempts to download unwanted file
Description	Detects when multiple attempts to download unwanted file occur.
Severity	Medium
Tactics	InitialAccess
Techniques	T1189
Required data connectors	SyslogAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic Rules/CiscoWSAMultipleUnwantedFileTypes.yaml
Version	1.0.2
Arm template	46b6c6fc-2c1a-4270-be10-9d444d83f027.json

KQL

let threshold = 2;
CiscoWSAEvent
| where DvcAction =~ 'BLOCK_ADMIN_FILE_TYPE'
| summarize i_src = makeset(SrcIpAddr) by UrlOriginal, bin(TimeGenerated, 15m)
| where array_length(i_src) >= threshold
| extend IPCustomEntity = i_src, UrlCustomEntity = UrlOriginal

YAML

query: |
  let threshold = 2;
  CiscoWSAEvent
  | where DvcAction =~ 'BLOCK_ADMIN_FILE_TYPE'
  | summarize i_src = makeset(SrcIpAddr) by UrlOriginal, bin(TimeGenerated, 15m)
  | where array_length(i_src) >= threshold
  | extend IPCustomEntity = i_src, UrlCustomEntity = UrlOriginal  
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: UrlCustomEntity
  entityType: URL
triggerOperator: gt
description: |
    'Detects when multiple attempts to download unwanted file occur.'
tactics:
- InitialAccess
severity: Medium
queryFrequency: 1h
kind: Scheduled
name: Cisco WSA - Multiple attempts to download unwanted file
triggerThreshold: 0
status: Available
id: 46b6c6fc-2c1a-4270-be10-9d444d83f027
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
relevantTechniques:
- T1189
version: 1.0.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic Rules/CiscoWSAMultipleUnwantedFileTypes.yaml
queryPeriod: 1h

ARM