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Introduction:
The traditional security perimeter has dissolved, shifting the attacker’s focus from network intrusion to identity compromise. A sophisticated technique exploiting Azure Active Directory and on-premises Active Directory trust, the Golden Ticket attack has evolved, allowing threat actors to forge Kerberos tickets for persistent, undetectable access across your hybrid cloud environment. This article deconstructs this critical attack vector and provides the essential commands to defend your identity infrastructure.
Learning Objectives:
- Understand the technical mechanics of the Azure AD Kerberos Gold Ticket attack.
- Learn to detect signs of Golden Ticket activity within both on-premises and cloud environments.
- Implement hardening measures to protect Kerberos authentication and break the attack chain.
You Should Know:
- Extracting the Azure AD Connect AD DS Account Password
The Azure AD Connect service uses an AD DS account to synchronize from on-premises AD to Azure AD. Compromising this account is the critical first step.
Command (Mimikatz):
lsadump::dcshadow /object:CN=AZUREADSSOACC,CN=Users,DC=domain,DC=local /attribute:krbtgt /value:<NTHash_of_OnPrem_krbtgt>
Step-by-step guide:
This advanced attack uses DCShadow to silently alter the `krbtgt` account’s password hash in Active Directory. First, the attacker must gain Domain Admin privileges. Using Mimikatz in DCShadow mode, they target the Azure AD Connect account object. The `/attribute:krbtgt` parameter specifies the change, and the `/value` is set to the NT hash of the on-premises krbtgt account. This forces the Azure AD Connect service to use a known, compromised secret for its Kerberos requests, enabling the forgery of tickets trusted by Azure AD.
- Forging the Kerberos Golden Ticket for Azure AD
With the compromised secret, the attacker can now create a forged Ticket-Granting Ticket (TGT).
Command (Mimikatz):
kerberos::golden /user:Administrator /domain:domain.local /sid:S-1-5-21-... /rc4:<AzureAD_SSO_Account_NTHash> /service:krbtgt /target:azuread.com /sids:S-1-5-21-...-518 /ptt
Step-by-step guide:
This Mimikatz command constructs the Golden Ticket. The `/user` and `/domain` are set to the desired impersonation context. The critical parameter is /rc4, which uses the NT hash of the compromised Azure AD SSO Account. The `/target:azuread.com` directs the ticket towards Azure AD resources. The `/sids` parameter includes the SID for the Microsoft Azure AD domain controllers, granting the necessary authorization. Finally, `/ptt` (Pass-the-Ticket) injects the forged ticket directly into the current session’s memory, ready for use.
3. Requesting an Access Token for Microsoft Services
The forged Kerberos ticket is then used to obtain a modern access token from Azure AD.
Command (PowerShell):
$kerbTicket = Get-KerberosTicket -Service 'HTTP/aws-prod-azureservices.azure.com' $accessToken = Get-AzureADAccessToken -KerberosTicket $kerbTicket -Resource 'https://graph.microsoft.com'
Step-by-step guide:
After the Golden Ticket is injected into the Kerberos cache, the attacker uses PowerShell to leverage it. `Get-KerberosTicket` (or a similar custom function) presents the forged ticket to the Azure AD Kerberos endpoint to request a service ticket. This service ticket is then exchanged for an OAuth 2.0 access token via the `Get-AzureADAccessToken` command, targeting a critical service like the Microsoft Graph API. This token is the key to accessing cloud resources.
4. Lateral Movement and Data Exfiltration
The access token grants the same permissions as a legitimate synchronized user.
Command (PowerShell – Microsoft Graph):
Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/users" -Headers @{Authorization = "Bearer $accessToken"}
Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/groups" -Headers @{Authorization = "Bearer $accessToken"}
Get-Message -Mailbox <TargetUser> -AccessToken $accessToken
Step-by-step guide:
With a valid access token, the attacker can perform any API call the compromised identity is authorized for. The first command fetches a list of all users in the directory. The second enumerates all groups. The third, a hypothetical cmdlet, represents accessing a user’s mailbox. These commands demonstrate how an attacker can perform reconnaissance and exfiltrate sensitive data directly from the cloud using the stolen token, all without triggering traditional network-based alarms.
5. Detecting Golden Ticket Activity On-Premises
Early detection is critical. Monitor for anomalous Kerberos TGT requests.
Command (Windows Security Log – XPath Query):
<QueryList> <Query Id="0" Path="Security"> <Select Path="Security"> [System[(EventID=4768 or EventID=4769)]] and [EventData[Data[@Name='TicketEncryptionType']='0x17']] and [EventData[Data[@Name='TicketOptions']='0x40810000']] </Select> </Query> </QueryList>
Step-by-step guide:
This custom XPath query for the Windows Event Viewer filters Kerberos TGT events (4768/4769). It looks for tickets using the `0x17` (RC4) encryption type, which is weaker and often used in attacks, combined with the `0x40810000` ticket options which are indicative of a renewal or forwardable ticket. A TGT request with these specific attributes, especially for a highly privileged account, is a strong indicator of Golden Ticket usage.
6. Monitoring for Azure AD Connect Account Anomalies
Detect compromise at the source by monitoring the Azure AD Connect account.
Command (PowerShell – Active Directory):
Get-ADUser -Identity "AZUREADSSOACC$" -Properties | Select-Object Name, LastLogonDate, LogonCount, PasswordLastSet, ServicePrincipalName
Get-WinEvent -LogName 'Security' | Where-Object {$<em>.Id -eq 4672 -and $</em>.Message -like "AZUREADSSOACC"}
Step-by-step guide:
The first command retrieves key properties of the Azure AD Connect computer account. Look for unexpected `PasswordLastSet` timestamps or a sudden increase in LogonCount. The second command searches the Security log for special privileges being assigned to this account (Event ID 4672). Any direct logon or privilege assignment to this account is highly unusual and warrants immediate investigation.
7. Implementing the Ultimate Mitigation: Cloud-Only Authentication
The most effective way to prevent this hybrid attack is to eliminate the dependency.
Command (PowerShell – Azure AD):
Set-MsolDomainAuthentication -DomainName "contoso.com" -Authentication Managed -FederationBrandName $null Disable-ADFSServerApplicationGroup -TargetApplicationGroup "Microsoft Office 365 Identity Platform"
Step-by-step guide:
These commands transition your domain from federated authentication (like ADFS or Pass-through Authentication) to cloud-only, password hash synchronization with Azure AD Seamless Single Sign-On. `Set-MsolDomainAuthentication` changes the domain’s federation settings to “Managed”. This severs the direct Kerberos trust chain that the Golden Ticket exploit relies on, moving the primary authentication authority to the cloud and rendering a compromised on-premises `krbtgt` useless for attacking Azure AD.
What Undercode Say:
- The attack surface has irrevocably shifted from the network perimeter to the identity layer. A single compromised on-premises service account can now lead to a full cloud breach.
- Defenders must adopt an “assume breach” mentality, focusing on detection and response within the identity plane rather than solely preventing initial entry. The sophistication of this attack demonstrates that perimeter-based thinking is obsolete.
The Azure AD Kerberos Gold Ticket is a paradigm-shifting attack. It proves that in a hybrid world, the security of your cloud is intrinsically tied to the security of your on-premises domain. Relying on legacy authentication protocols like Kerberos without additional, robust controls (such as certificate-based authentication and continuous access evaluation) creates a critical vulnerability. Organizations can no longer treat their identity providers as a secondary concern; they are the primary battleground. Investing in advanced identity protection, strict conditional access policies, and a rapid detection capability for identity-based anomalies is no longer optional—it is the core of modern cybersecurity.
Prediction:
The success of the Azure AD Golden Ticket attack will catalyze a rapid evolution in offensive tradecraft, moving entirely to the identity plane. We predict a surge in AI-powered identity attacks, where machine learning models will be used to analyze user behavior, generate convincing, context-aware login attempts, and automate the discovery of misconfigured conditional access policies. Furthermore, as Passwordless and FIDO2 security keys become more prevalent, attackers will pivot to targeting the underlying registration and trust-establishment processes, attempting to compromise device attestations or social engineer users into re-registering credentials to a malicious actor-controlled endpoint. The future of hacking is not breaking in; it’s logging in.
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IT/Security Reporter URL:
Reported By: Tarak Bach – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
