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Hello KQL

Date: 25. January 2022

Hosts - Gianni - Alex

Guest - @rodtrent

Show Content - Show Presentation - Show Recording


This was the very first show of the KQL Cafe. where we first shared our mission with the community and explained how we plan to run the show.

Our Mission for KQL Cafe

  • A Community to make the world a better place with KQL
  • Learn, share and practice the KQL language


  • Where do we KQL?
  • Your Playground Options
  • KQL Basics | Top 8 Operators
  • KQL Tables | How to find new things
  • Working with IOCs
  • Features worth mentioning
  • Todays guest speaker: Rod Trent
  • What did you do with KQL this month?
  • KQL Challenge of the month

Where do we KQL

Alex and Gianni provided an overview of the Microsoft Products where we can use KQL

  • Microsoft 365 Defender
  • Microsoft Sentinel
  • Log Analytics
  • Data Explorer
  • Microsoft Endpoint Configuration Manager (CMPivot)

KQL Playground options

If you don't have access to Azure, don't worry, you can learn KQL for free using the publicely available Log Analytics demo environment.

KQL Basics

To get you started, Gianni provided an overview on the Top 8 KQL operators

The sample queries used by Gianni can be found here

KQL how to find new things

Alex provided some examples how to find new tables or attributes stored within Microsoft Sentinel or Microsoft Defender 365. No rocked sciense here, just look around, take a table of interest and first look at the attributes, then find out what data is in these tables. As an example take the the DeviceEvents table from Microsoft Defender for Endpoint and run the following KQL query to find all ActionTypes

| Distinct ActionType

Working with IOCs

Gianni demonstrated a KQL query where he uses the externaldata operator to fetch ASN information from a file stored on GitHub and then uses that data to find possible matches within the AzureAD sign-in logs.

You can find the query here

Features worth mentioning

The Query Explorer in Log Analytics has been replaced by Azure QueryPacks, Alex basically explained what's described in the above referenced Tech Community Article.

Todays guest speaker: Rod Trent

We were very pleased to have Rod Trent as our very first guest speaker. Rod Trent is a Senior Cloud Security Advocate @ Microsoft and he's as crazy about KQL as we are.

Rod Trent talked with us about the importance of KQL and the impact it can make on your IT career. It's like with PowerShell, these day, when using any of the above mentioned technologies, you must learn KQL. In fact that's why Rod started the Must Learn KQL series

And we're happy that Rod has made available the KQL Cafe Edition of the Must Learn KQL Coffee Mug that we will send to our upcomming guest speakers at the KQL Cafe show.


  • Rod Trent blog:
  • Must Learn KQL series:
  • GitHub:
  • LinkedIn Profile:
  • Twitter:

What did you do with KQL this month?

In this part of the episode we invite the community to talk about what they did with KQL recently. To get things started, Alex demonstrated his query to pull Windows OS End of Service information from the Threat and Vulnerability tables in Microsoft Defender for Endpoint. You can find the query here: MDE - EOS Windows versions

Rod shared these links:

  • Common Security Log Costs by Vendor:
  • Data Per Computer:
  • Data Per Syslog Server:

KQL Challenge of the month

For this month the KQL challenge of the month is about IOCs. Try creating a query that uses IOC data stored in a watchlist or use the external data operator and then join the data with your Sign-in logs, DeviceNetworkEvents or any other data you have in your or in the public Log Analytics workspace.

Feel free to submit your query prior the next show.

To get you started, below is an example from Gianni.

let List = (externaldata(Netblock:string, Company:string, Count:int) [@""] with (ignoreFirstRecord=true, format="SCsv"));
| where ResultType in(0, 50125, 50140, 70043, 70044)
| evaluate ipv4_lookup(List, IPAddress, Netblock)
| project-reorder TimeGenerated, Identity, UserPrincipalName, ClientAppUsed, AppDisplayName, IPAddress, Company, DeviceDetail 

let List = (externaldata(Netblock:string, Company:string, Count:int) [@""] with (ignoreFirstRecord=true, format="SCsv"));
| evaluate ipv4_lookup(List, ClientIP, Netblock)
| project-reorder TimeGenerated


  • SQL to KQL cheat sheet:
  • Must Learn KQL:
  • KQL Playground:
  • The “merch” store:
  • The tie fighter KQL query: