How to setup a Canarytoken and receive incident alerts on Azure Sentinel

Published Dec 08 2020 07:33 AM 5,047 Views
Microsoft

With Azure Sentinel you can receive all sorts of security telemetry, events, alerts, and incidents from many different and unique sources. Those sources can be firewall logs, security events, audit logs from identity and cloud platforms. In addition, you can create digital trip wires and send that data to Azure Sentinel. Ross Bevington first explained this concept for Azure Sentinel in “Creating digital tripwires with custom threat intelligence feeds for Azure Sentinel”. Today you can walkthrough and expand your threat detection capabilities in Azure Sentinel using Honey Tokens or in this case Canarytokens.

 

What is a Honey Token? A honey token is a digital artifact like a Word Document, Windows Folder, or JavaScript file that when opened or accessed will act as a digital trip wire and alert you to being used. When used the honey token might make a GET HTTP call to a public facing URL or IP. The so that an attacker would want to investigate and exfiltrate the artifact but also ensuring you reduce false positives from normal users. One way to do this is creating a separate folder from the normal directory structure. This could take the form of naming a Word document High Potential Accounts.docx. And then placing it in a Sales share but inside two more nested directories.

 

The other key is to make the digital artifact searchable or easily found, you want the attacker to see the token and access it. You can also sprinkle these honey tokens through out the network and in different use cases beyond. The key here is ensuring that the honey token is in a visible location and can directory searched upon by normal user credentials.

 

As with most things a balanced approach should be taken with honey token names and placement. Think through where in the cyber kill chain you want the digital trip wire, and ways to make the token enticing to an attacker but will also reduce false positives from normal employees and routines.

 

Honey Tokens are not a new concept but the following approach described to use a service called Canarytokens is a bit newer. Canarytokens is a free service provided by Thinkist that generates different types of tokens and provides the back end trip wire logging and recording. The service allows you to focus on the naming and placement specific to your industry and buisness rather then building a Public facing URL that logs and collects the tokens being tripped. Thinkist also has a paid service as well that includes many useful features.

 

In the below example you will walk through creating a free Canarytoken (honey token as described) but through a Canary service and use it to update Azure Sentinel when it is triggered.

 

To begin with you can deploy a Logic App Ingest-CanaryTokens here. The Logic App will act a listener and will provide a URL you can use in the Canarytoken generation.

 

To Deploy the Logic App fill in your Azure Sentinel Workspace ID and Key.

 

deployla.png

 

Once deployed go to the Logic App and in the Overview click on the blue link: See trigger history

 

laurl.png

 

Copy the URL from the following field: Callback url [POST]

 

laurl2.png

 

With this LogicApp and a Callback listening URL you can now generate a Canarytoken.

 

To create the Canarytoken go to the following website: Canarytokens

 

  1. Choose Microsoft Word Document
  2. Fill out your email address and enter a <SPACE> and paste the Logic App Callback URL
  3. In the final field enter a description, - see below

 

You will use description to also host your Entities for Azure Sentinel. You can use a comma as a separator between the entity information you want to capture upon tripping the wire.

 

Be sure to be descriptive to what Server\Share or OneDrive the Canarytoken will be placed. Because you will generate several different tokens the descriptive notes will come in the alert that is triggered ensuring you will be able to dive further on that Server or Service to investigate further activity of the attacker.

 

In this example you could use:

Name Descriptor  Azure Sentinel parsed column name  
Computername The Computername where Canarytoken is hosted CanaryHost  
Public IP

the public ip of internet access where token is hosted. Can be used to correlate if token is launched within data center or known public ip of server

CanaryPublicIP
 
Private IP

Private ip of computer where token is hosted could be used to correlate additional logs in Firewalls and other IP based logs

CanaryPrivateIP  
Share Path

The share path this Canarytoken is hosted at, helps indicate where a scan or data was compromised at.

CanaryShare  
Description

helps provide addition context for SOC Analyst about purpose of Canarytoken and it’s placement

CanaryDescription  

 

*EXAMPLE:

 

FS01,42.27.91.181,10.0.3.4,T:\departments\sales\hipo\specials,token placed on FS01 available to all corporate employees and vendors

 

     4. Once Completed click Create my Canarytoken

 

gentoken.png

 

Check out the further use cases for the Canarytokens to be placed. Go ahead and Download your MS Word file.

 

downloadtoken.png

 

Notice the file name that downloads is the Canarytoken id itself. This word document name really is not that compelling for an attacker to discover, exfiltrate, and investigate. You should rename the file immediately to something more compelling.

 

You want to grab the attention of the attacker searching for valuable information. Remember the overall arching goal for most attackers is obtaining key corporate data. The Canarytoken is helping alert to the violation of confidentiality, integrity and availability of key corporate data. Names like Project Moonshot placed in NextGeneration folder could help entice. Document name like High Potential Account List in a Sales team folder may also do the trick. Be creative to your industry and business as to what data could be valuable.

 

In this example we used White Glove Customer Accounts.docx

 

renametoken.png

 

To make the document seem more legitimate you can use a website Mockaroo - Random Data Generator and API Mocking Tool | JSON / CSV / SQL / Excel to generate random and fictious data easily. Here you can create what appears to be a customer account list with account numbers and email addresses.

 

mockaroogendata.png

 

Once you fill out the fields you want go ahead and download a CSV sample by clicking Download Data green button. Open with Excel and be sure to manipulate the Rows and Columns to make it nicely formatted. With the table looking presentable copy the content in Excel and Open the Word Document Canarytoken and paste the content in and save the document.

 

pastedwordtoken.PNG

 

You now have a Canarytoken that looks authentic and hopefully will not arouse the suspicion of the attacker but will be visible and entice them greatly to exfiltrate and open it. Continue to examine Mockaroo and the data you can generate it is a very easy to use and helpful tool.

 

Now find a home for the word document in a File Share on a File Server, or as an email attachment in your executives mailbox – again think back to the description you gave it and follow that to where it is placed so in the worst case you are attacked this can tip you off to where on your network to focus your investigation further in Azure Sentinel’s logs and events you are collecting.

 

To test this open the Word Document on your computer or on another server or computer with word. When Microsoft Word opens a .1 by .1 header and footer image with a open URL will execute a GET HTTP call to the appropriate CanaryToken endpoint you created earlier. Once this occurs you will receive an email with details like below.

 

email.png

 

Be sure to also check out the More info on this token here link, which will provide more geo information on the public ip that opened the document and also if it came off a known Tor browser or not.

 

canaryhistory.png

 

You can also download a JSON or CSV file of the detailed information found in the Incidents generated when the Canarytoken was opened.

 

In addition to the email the Logic App listener will be invoked which will take the Incident Data and enrich it a little further and send it to Azure Sentinel into a custom logs table named CanaryTokens_CL.

 

lalogsearch.png

 

Some of those enriched fields include geo information on the public ip address that triggered the Canarytoken. There is also parsed information from the memo field to include specifics around the Canarytokens placement in your environment and objectives and some logic to tell you if the canary was triggered on host. Finally string fields for URLs have been populated for you to review the management and history of the Canarytoken if you need to pivot from Azure Sentinel to the Canarytoken specifically while investigating.

 

You can now use Azure Sentinel to raise a High Priority incident and work the incident with case management. You can also correlate logs and data with other Azure Sentinel data collected further helping you investigate the incident.

 

An example Scheduled query rule in Azure Sentinel you can use following along this walkthrough. Step by step instructions Here

 

 

 

 

 

 

 

 

id: 27dda424-1dbe-4236-9dd5-c484b23111a5
name: Canarytoken Triggered
description: |
  'A Canarytoken has been triggered in your enviroment, this may be an early sign of attacker intent and activity, 
    please follow up with Azure Sentinel logs and incidents accordingly along with the Server this Canarytoken was hosted on.
    Reference: https://blog.thinkst.com/p/canarytokensorg-quick-free-detection.html'
severity: High
requiredDataConnectors:
  - connectorId: Custom
    dataTypes:
      - CanaryTokens_CL
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Discovery
  - Collection
  - Exfiltration
relevantTechniques:
query: |
CanaryTokens_CL
| extend Canarydata = parse_csv(memo_s)
| extend CanaryHost = tostring(Canarydata[0]), CanaryPublicIP = tostring(Canarydata[1]), CanaryPrivateIP = tostring(Canarydata[2]), CanaryShare = tostring(Canarydata[3]), CanaryDescription = tostring(Canarydata[4])
| extend CanaryExcutedonHost = iif(CanaryPublicIP == src_ip_s, true, false)
| extend timestamp = TimeGenerated, IPCustomEntity = src_ip_s //,AccountCustomEntity = user_s, HostCustomEntity = computer_s
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity

 

 

 

 

 

 

 

 

 

Once you have created the rule, open the Canarytoken word document one more time to generate an alert.

 

Within 15 minutes or so a new Azure Sentinel Incident for the Canarytoken being trigged will appear, your SOC can now use the Logs fed into Azure Sentinel to correlate and investigate further.

 

incident.png

 

In addition the Investigate Graph is also populated with the Public IP Address of where this was triggered.

 

investigate.png

 

Please tweak the Custom Entities to your liking. Another way is to point where the Canarytoken was placed to bolster the pivot of the Investigation graph. The above alert sample parses the memo field you added early with commas when generating the initial Canarytoken.

 

parsealert.png

 

In this article you learned about honey tokens and a Canary service and how to use Canarytokens in your environment and integrate the enriched alerts into Azure Sentinel raising awareness of a potential attacker and data exfiltration that may have occurred.

 

You have just scratched the surface with the concept of honey tokens. If you are interested in learning more in depth I highly recommend Chris Sander’s book Intrusion Detection Honeypots which is a excellent resource.

 

Special thanks to:

@Ofer Shezaf for reviewing this post

@Chris Sanders for inspiration and information on the topic of Honey Tokens

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