AZURE ADVANCED THREAT PROTECTION DEPLOYMENT AND TROUBLESHOOTING

This article is contributed. See the original author and article here.

Hi IT Pros,

Recently, I search the internet and could not find the document for Azure ATP Setup and Troubleshooting. So, I prepare the document for our convenient reference and deployment in the future.

Please check it out and give your feedback.

AZURE ADVANCED THREAT PROTECTION

DEPLOYMENT AND TROUBLESHOOTING

The setup procedure for Azure Advanced Threat Protection – AATP, includes the following steps:

Prepare Domain for AATP operation.
Install Sensors for Domain Controllers
Configure AATP
Troubleshoot and Test.

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A. Prepare Domain for Azure ATP (ATTP)

Creating the group Managed Service Accounts (gMSA) for ATTP.

In Windows Server 2012 and later Domain, services or service administrators do not need to manage password synchronization between service instances when using group Managed Service Accounts (gMSA).

You provision the gMSA in AD and then configure the service which supports Managed Service Accounts.

You can provision a gMSA using the *-ADServiceAccount cmdlets which are part of the Active Directory module. Service identity configuration on the host is supported by:

Same APIs as sMSA, so products which support sMSA will support gMSA
Services which use Service Control Manager to configure logon identity
Services which use the IIS manager for application pools to configure identity
Tasks using Task Scheduler.

gMSA Prerequisite:

gMSA required KDS Root Key. It is used by the KDS service on DCs (along with other information) to generate passwords. It is required only once per forest.

a) To Create KDS Root key:

Add-KdsRootKey -EffectiveImmediately

Will need time for key to be propagated to all other DCs,

b) To create a gMSA using the New-ADServiceAccount cmdlet

On the Windows Server 2012 domain controller or later, Run AD Powershell:

New-ADServiceAccount ITFarm1 -DNSHostName ITFarm1.contoso.com

-PrincipalsAllowedToRetrieveManagedPassword DC01$

-KerberosEncryptionType RC4, AES128, AES256

-ServicePrincipalNames http/ITFarm1.contoso.com/contoso.com, http/ITFarm1.contoso.com/contoso, http/ITFarm1/contoso.com, http/ITFarm1/contoso

Name	ITFarm1
DNSHostName	DC01.contoso.com
KerberosEncryptionType	None, RC4, AES128, AES256
ManagedPasswordIntervalInDays	Password change interval in days (default is 30 days if not provided)
PrincipalsAllowedToRetrieveManagedPassword	The computer accounts of the member hosts or the security group that the member hosts are a member of
SamAccountName	NetBIOS name for the service if not same as Name
ServicePrincipalNames	Service Principal Names (SPNs) for the service http/ITFarm1.contoso.com/contoso.com, http/ITFarm1.contoso.com/contoso, http/ITFarm1/contoso.com, http/ITFarm1/contoso, MSSQLSvc/ITFarm1.contoso.com:1433, MSSQLSvc/ITFarm1.contoso.com:INST01

Note: The password change interval can only be set during creation and cannot change later.

To create a gMSA for outbound authentication only using the New-ADServiceAccount cmdlet

New-ADServiceAccount ITFarm1 -RestrictToOutboundAuthenticationOnly – PrincipalsAllowedToRetrieveManagedPassword DC01$

c) Add member hosts to gMSA

Get-ADServiceAccount [-Identity] ITFarm1 -Properties PrincipalsAllowedToRetrieveManagedPassword

Set-ADServiceAccount [-Identity] ITFarm1

-PrincipalsAllowedToRetrieveManagedPassword DC01$,DC02$,DC03$

Better option:

You could create AD Security Group “SensorDCs” whose members are Sensor DCs and set AD service account to allow retrieving password:

Set-ADServiceAccount ITFarm1 -PrincipalsAllowedToRetrieveManagedPassword SensorDCs

B. Installing Sensor for All Domain Controllers

Prerequisites for Domain Controllers:

Make sure Microsoft .Net Framework 4.7 or later is installed on the machine. If Microsoft .Net Framework 4.7 or later isn’t installed, the Azure ATP sensor setup package installs it, which may require a reboot of the server.
Quick check if the Domain Controllers have enough CPU and Memory for Sensor to collect traffic packets and analyze them. The following CPU and Random Access Memory (RAM) capacity refers to the sensor’s own consumption, not the domain controller capacity.

Packets per second	CPU (cores)*	Memory (GB)**
0-1k	0.25	2.50
1k-5k	0.75	6.00
5k-10k	1.00	6.50
10k-20k	2.00	9.00
20k-50k	3.50	9.50
50k-75k	3.50	9.50
75k-100k	3.50	9.50

* This includes physical cores, not hyper-threaded cores.
** Random-access memory (RAM)

The recommended and simplest way to determine capacity for your Azure ATP deployment is to use the Azure ATP Sizing Tool downloadable from Github, see the Domain controller traffic estimator

a. Create Azue ATP Instance

New AATP Instance will be created:

Your Azure ATP instance is automatically named with the Azure AD initial domain name and created in the data center located closest to your Azure AD.

Click Configuration, Manage role groups, and use the Azure AD Admin Center link to manage your role groups.

b. Connect AATP Instance to AD Forest

The first time you open the Azure ATP portal, the following screen appears:

c. Download and Install the Sensor to DC

Download and copy the Access key. The access key is required for the Azure ATP sensor to connect to your Azure ATP instance (one-time-password for sensor deployment).

Under Configure the sensor, enter the installation path and the access key that you copied from the previous step, based on your environment:

Azure ATP sensor service and Azure ATP sensor updater service are now available in Windows Services as shown:

Finish, reboot the DC Sensor Server.

If the domain controller is the first deployed sensor, you will need to wait at least 15 minutes to allow the database backend to finish initial deployment of the necessary microservices.

If you experience any error during installation process, please refer to the Troubleshooting section (section IV)

d. To check if Sensor is working correctly:

Installing AATP Sensor on Core Server:

Support for Windows 2016, 2019 Server Core (nano editions are not supported)
“Azure ATP sensor Setup.exe” /quiet NetFrameworkCommandLineArguments=”/q” AccessKey=”<Access Key>”
Or by Powershell

./”Azure ATP sensor Setup.exe” /quiet NetFrameworkCommandLineArguments=”/q” AccessKey=”<Access Key>”

To Update Sensor:

“Azure ATP sensor Setup.exe” [/quiet] [/Help] [NetFrameworkCommandLineArguments=”/q”]

C. Configure AATP

a. To Configure detection Exclusions and Honeytoken

Honeytoken accounts, which are used as traps for malicious actors – any authentication associated with these honeytoken accounts (normally dormant), triggers an alert.

Honeytokens can exist in many forms, from a dead, fake account to a database entry that would only be selected by malicious queries, making the concept ideally suited to ensuring data integrity. A particular example of a honeytoken is a fake email address used to track if a mailing list has been stolen.

From the Azure ATP portal, click on the settings icon.
Under Detection, click Entity tags.
Under Honeytoken accounts, enter the Honeytoken account name and click the + sign. The Honeytoken accounts field is searchable and automatically displays entities in your network. Click Save.

Add Sensitive Accounts:

Sensitive Accounts: Enter the account you want to monitor lateral movement, modification change, high privilege accounts.

Sensitive groups: Enter the account you want to monitor lateral movement, modification change, high privilege administrative group.

Click Exclusions. Enter a user account or IP address to be excluded from the detection, for each type of threat.
Click the plus sign. The Add entity (user or computer) field is searchable and will autofill with entities in your network. For more information, see Excluding entities from detections and the security alert guide.

Click Save.

b. To receive notifications to a specific email address:

In the Azure ATP portal, select the “settings” icon
Click Notifications.
Under Mail notifications, specify which notifications should be sent via email – they can be sent for new alerts (suspicious activities) and new health issues.
Click Save.

c. Configure the Collection of Audit Events in GPO

Azure Advanced Threat Protection (Azure ATP) detection relies on specific Windows Event log entries to enhance some detections and provide additional information on who performed specific actions such as NTLM logons, security group modifications and others.

You can use the Default Domain Controllers Policy or a dedicated GPO to set the following audit policies:

go to Computer Configuration > Policies > Windows Settings > Security Settings
Go to Advanced Audit Policy Configuration
Audit Policies.

Under Audit Policies, edit each of the following policies
select Configure the following audit events for both Success and Failure events.

GPO SETTINGS
Audit policy	Subcategory	Triggers event IDs
Account Logon	Audit Credential Validation	4776
Account Management	Audit Computer Account Management	4743
Account Management	Audit Distribution Group Management	4753, 4763
Account Management	Audit Security Group Management	4728, 4729, 4730, 4732, 4733, 4756, 4757, 4758
Account Management	Audit User Account Management	4726
System	Audit Security System Extension	7045

c. Configure the Collection of Event 8004 NTLM Authentication:

Go to Local Policies > Security Options.
Under Security Options, configure the specified security policies, as follows:

Network security: Restrict NTLM: Outgoing NTLM traffic to remote servers	Audit all
Network security: Restrict NTLM: Audit NTLM authentication in this domain	Enable all
Network security: Restrict NTLM: Audit Incoming NTLM Traffic	Enable auditing for all accounts

D. Troubleshoot and Test AATP result

a. To Test AATP

You could simulate the attacks from fake virus script and files at the following link :

https://securitycenter.microsoft.com/tutorials/all

View responses from AATP portal at https://portal.cloudappsecurity.com

InvestigateActivity logs

b. Troubleshooting

AATP logs ‘ locations:

Azure ATP Deployment logs

The Azure ATP deployment logs are located in the temp directory for the user who installed the product. C:UsersAdministratorAppDataLocalTemp (or one directory above %temp%).

Azure ATP logs

C:Program FilesAzure Advanced Threat Protection Sensorversion numberLogs.

Microsoft.Tri.Sensor.log – This log contains everything that happens in the Azure ATP sensor (including resolution and errors).
Microsoft.Tri.Sensor-Errors.log – This log contains just the errors that are caught by the ATP sensor.
Microsoft.Tri.Sensor.Updater.log – This log is used for the sensor updater process (automatically updated).

The knowns issue related to AATP setup and Configuration as follow:

Sensor Installation error, error ID 1068:

Solution: Reboot is needed to start sensor service.

Sensor Installation error, “Sensor Failure Communication”

System.Net.Http.HttpRequestException: An error occurred while sending the request. —>

or System.Net.WebException: Unable to connect to the remote server —>

or System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond…

Solution: Make sure that communication is not blocked for localhost, on TCP port 444

Sensor Installation error on DC with NIC Teaming

NIC Teaming for AATP required Npcap driver with WinPcap mode.

Solution:

Uninstall Sensor,
Install the Npcap version 0.9984 installer from https://nmap.org/npcap/
using the GUI installer, deselect the loopback support and

select WinPcap mode.

Reinstall the sensor package.

Sensor installation error on DC with Multi Processor Group mode

For Windows Operating systems 2008R2 and 2012, Azure ATP Sensor is not supported in a Multi Processor Group mode.

Suggested possible workarounds:

If hyper threading is on, turn it off. This may reduce the number of logical cores enough to avoid needing to run in Multi Processor Group mode.

If your machine has less than 64 logical cores and is running on a HP host, you may be able to change the NUMA Group Size Optimization BIOS setting from the default of Clustered to Flat.

Create AD Service Account with “key does not exist” error

Solution: You will need to create KDS Root key if get error: “Key does not exist”

More info:

Azure ATP setup

Server Core setup:

https://docs.microsoft.com/en-us/azure-advanced-threat-protection/atp-silent-installation

Azure ATP Configuration

https://docs.microsoft.com/en-us/azure-advanced-threat-protection/install-atp-step5

Troubleshooting

https://docs.microsoft.com/en-us/azure-advanced-threat-protection/troubleshooting-atp-known-issues#:~:text=Troubleshooting%20Azure%20ATP%20Known%20Issues%201%20Sensor%20failure,virtual%20machine%20sensor%20issue.%20…%20More%20items…%20

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Thanks for reading this blog. Our next discussion topic would be the “AATP Operation” blog article.

Happy AATP Monitoring!

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