A host is potentially running a crypto miner ASIM Web Session schema

let threatCategory="Cryptominer";
let knownUserAgentsIndicators = materialize(externaldata(UserAgent:string, Category:string)
    [ @"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/UnusualUserAgents.csv"] 
        with(format="csv", ignoreFirstRecord=True));
let knownUserAgents=toscalar(knownUserAgentsIndicators | where Category==threatCategory | where isnotempty(UserAgent) | summarize make_list(UserAgent));
let customUserAgents=toscalar(_GetWatchlist("UnusualUserAgents") | where SearchKey==threatCategory | extend UserAgent=column_ifexists("UserAgent","") | where isnotempty(UserAgent) | summarize make_list(UserAgent));
let fullUAList = array_concat(knownUserAgents,customUserAgents);
_Im_WebSession(httpuseragent_has_any=fullUAList)
| summarize N_Events=count() by  SrcIpAddr, Url, TimeGenerated, HttpUserAgent, SrcUsername
| extend AccountName = tostring(split(SrcUsername, "@")[0]), AccountUPNSuffix = tostring(split(SrcUsername, "@")[1])

name: A host is potentially running a crypto miner (ASIM Web Session schema)
queryFrequency: 15m
kind: Scheduled
description: |
    'This rule identifies a web request with a user agent header known to belong to a crypto miner. This indicates a crypto miner may have infected the client machine.<br>You can add custom crypto mining indicating User-Agent headers using a watchlist, for more information refer to the [UnusualUserAgents Watchlist](https://aka.ms/ASimUnusualUserAgentsWatchlist).<br><br>   This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
id: 8cbc3215-fa58-4bd6-aaaa-f0029c351730
triggerOperator: gt
version: 1.1.4
metadata:
  source:
    kind: Community
  categories:
    domains:
    - Security - Threat Protection
  author:
    name: Yaron
  support:
    tier: Community
entityMappings:
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
- entityType: IP
  fieldMappings:
  - columnName: SrcIpAddr
    identifier: Address
- entityType: Account
  fieldMappings:
  - columnName: SrcUsername
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
tags:
- ParentAlert: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/CiscoUmbrella/CiscoUmbrellaCryptoMinerUserAgentDetected.yaml
  version: 1.0.0
- SchemaVersion: 0.2.1
  Schema: ASimWebSession
relevantTechniques:
- T1496
tactics:
- Impact
triggerThreshold: 0
queryPeriod: 15m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimWebSession/UnusualUACryptoMiners.yaml
requiredDataConnectors:
- dataTypes:
  - SquidProxy_CL
  connectorId: SquidProxy
- dataTypes:
  - CommonSecurityLog
  connectorId: Zscaler
eventGroupingSettings:
  aggregationKind: AlertPerResult
query: |
  let threatCategory="Cryptominer";
  let knownUserAgentsIndicators = materialize(externaldata(UserAgent:string, Category:string)
      [ @"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/UnusualUserAgents.csv"] 
          with(format="csv", ignoreFirstRecord=True));
  let knownUserAgents=toscalar(knownUserAgentsIndicators | where Category==threatCategory | where isnotempty(UserAgent) | summarize make_list(UserAgent));
  let customUserAgents=toscalar(_GetWatchlist("UnusualUserAgents") | where SearchKey==threatCategory | extend UserAgent=column_ifexists("UserAgent","") | where isnotempty(UserAgent) | summarize make_list(UserAgent));
  let fullUAList = array_concat(knownUserAgents,customUserAgents);
  _Im_WebSession(httpuseragent_has_any=fullUAList)
  | summarize N_Events=count() by  SrcIpAddr, Url, TimeGenerated, HttpUserAgent, SrcUsername
  | extend AccountName = tostring(split(SrcUsername, "@")[0]), AccountUPNSuffix = tostring(split(SrcUsername, "@")[1])  
severity: Medium
customDetails:
  UserAgent: HttpUserAgent
alertDetailsOverride:
  alertDisplayNameFormat: The host {{SrcIpAddr}} is potentially running a crypto miner
  alertDescriptionFormat: The host at address {{SrcIpAddr}} sent an HTTP request to the URL {{Url}} with the HTTP user agent header {{HttpUserAgent}}. This user agent is known to be used by crypto miners and indicates crypto mining activity on the client.