Questions tagged [active-directory]

Active Directory (AD) is a directory service created by Microsoft for Windows domain networks. It provides a central location for network administration and security.

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52 views

How NTLM SSO is preformed on smartcard Kerberos logon?

I have been researching kerberos and ntlm for the last couple of days and still got one thing unresolved. After an interactive logon with kerberos, you will have in the cached credentials both ...
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56 views

Ways to exploit AD in context of Domain Computer account not as Domain user account?

There are hundreds of articles if we search "how to exploit AD Environment?" but if you read them, you will find that every article focuses on the context of the domain user Account. Now I ...
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Risk associated with Exchange email address as username when AD authentication is enabled

In my existing setup, we have Exchange Server joined with Windows Active Directory. Both the username and email address are the same for user accounts. Our support party also recommended using this ...
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91 views

What legitimate services uses SAMR queries? And how to verify?

Recently I noticed that every few days, at (almost) the same time, one host is querying the Domain Controller for group members using SAMR calls. I am trying to understand why its happening ...
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94 views

Hardware for password cracking

I'm planning to extend my pentest services to Password Cracking, to be more precise: Cracking Active Directory Passwords, extracted from the customers Active Directory in order to check users ...
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22 views

RAP as a Service vs other freeware software tools

Microsoft offers RAP as a Service for various platforms like AD, Exchange, Windows Servers/Desktops etc. Does anyone have an insight about these services from Microsoft vs other free tools like for AD ...
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48 views

Non-malicious root causes for multiple failed logon in windows domain

While monitoring SIEM alerts, I saw that there was more than 200 failed logon for a user to several hosts in the domain. Obviously, it was triggered as a brute-force attempt. Assuming it was not an ...
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Should I consider migrating away from OAuth 2.0 Implicit Flow for an internal application relying on Azure AD?

I have recently migrated an internal application (API + SPA) security from Windows Authentication (done by IIS) to Azure A/D authentication using the implicit flow. Now, every user must enter an e-...
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105 views

Why do administrators create passwords vulnerable to kerberoasting? [closed]

I was researching a kerberoasting attack on the Active Directory domain. To create the stand, I used a Domain Controller on Windows Server 2016 and one client machine on Windows 10. SQL Server was ...
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How do you protect against Active Directory Golden Ticket Attacks?

I'm looking at hardening our AD. One concern I have is around Golden Ticket Attacks using Mimikatz and the likes (https://attack.stealthbits.com/how-golden-ticket-attack-works). One of the things that ...
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Should one Windows Server serve both high and low trust devices?

The high and low-trust devices themselves are separated by VLANs, however they both need to be connected to an Active Directory. The only way for the low-trust VLAN to access the high-trust VLAN would ...
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57 views

Azure Ad B2C Users access resources in other directory

I have two directories in Azure. The first one contains all the customers of our company, who are registered in Azure Ad B2C. These users must be separated from the other directory, which contains ...
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68 views

Discover AD accounts with LM Hashes

During a recent security audit, we found that a handful of accounts still have credentials identified as stored in LM hash format. For us, these were ancient service accounts and the like - easy ...
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715 views

Is it possible make a Pass-The-Hash attack with Responder?

The tool Responder written in Python permits to listen on a specific network card requests and automatically poisoning victims the steal hash NTLMv1 and hash NTLMv2. The attack Pass-The-Hash permits ...
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55 views

Apply policy to specific users OR computers

I was directed to post my question here from stackoverflow. Need some guidance implementing a policy. Specifically a block removable storage policy. Let's say I have 100 computers named PC1-PC100. PC1-...
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79 views

Login with AD credentials on behalf of a user

We have a web solution (running in IIS) where AD users and non-AD users need to log into. We sell this to companies and will run this on-prem only. non-AD-FS and only AD question (so no federation) I ...
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Are there any known attacks (technical or social) against enterprises where password resets are scheduled on fixed (known) intervals?

A company I know of has a password policy that requires employees to change passwords (on AD server) every 90 days. The vast majority of its new hires start on the 1st of the month. Thus, several ...
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224 views

How often should we force users to re-authenticate when not on the network?

Our company has rolled out MFA to our users. We are a Microsoft shop, so we are using Azure AD to handle MFA and authentication to things like email, Teams, Sharepoint, etc. By default, we've disabled ...
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80 views

Requiring an on-site visit to reset a password or get VPN access

This is a question born more from the user perspective but I'm wondering how it fits into a proper user creation and management policy. As a consultant I tend to work with various different clients ...
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27 views

Detecting multiple active login sessions to AD with workstation/DC event logs

I'm using Splunk to try to detect multiple Windows login sessions by a single user, as an indicator of compromise. However, I'm not sure how to go about this - I can ingest workstation logs (events ...
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2k views

RDP Authentication with domain credentials

There's something I don't get with RDP in a domain. During an authentication, if we're using a local account of the distant machine, then the creds are in the SAM so all good. But with a domain ...
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109 views

Is kerberos unconstrained delegation partially safer than constrained delegation?

When you're using unconstrained delegation, a service A is allowed to authenticate as the user B to any other service. This happens because the user B sends its TGS along with its TGT to the service A,...
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724 views

Manually creating computer account and SPN's in Kerberos (krb5) keytab file for Window Active Directory domain

Lots of articles on the net describes how you can join a Linux box to a Windows Active Directory domain, some using "realmd", some using samba and so forth. Others describe how you can do things ...
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678 views

Active Directory authentication with a Login form ASP.NET MVC5

I want to create a web application with a login form and authenticate with Active Directory account. Our users sometimes use a device that users cannot log in, so we don't want to use Windows ...
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95 views

Best practices or advice to convince IT admins not to map network drives in privileged sessions with users

We are currently trying to enhance the security posture of our company, and this means changing how some IT personnel work. Put precisely, our IT helpdesk currently have 2 separate accounts: 1 for ...
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203 views

How do companies authenticate internal users in internal systems?

Assuming that a company has an AD/LDAP server with accounts for all employees and has many internal systems that must authenticate those users, what would be a good solution in terms of security best ...
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1k views

Active Directory Pentesting Methodologies

I would like to ask about steps and methodologies for Active Directory pentesting. I used tools like responder, powerview, pingcastle and mimikatz, but maybe there are other methods that are useful.
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critical files to be monitored by file integrity monitoring solutions in active directory servers

We are implementing file integrity solution on Microsoft active directory servers, I need to know the critical paths(files and folders and registry keys) that need to be monitored for any change or ...
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122 views

Lateral Movement: What is the benefit of Windows Hello For Business?

I work as a security researcher, tonight I implemented Windows Hello For Business in our environment, because it is marketed as the "passwordless way of the future" and I wanted to see if it holds up ...
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110 views

Identity management in a mixed Linux/Windows environment

At places like Google, where some users use Linux and others use Windows and even Mac, how are they managing IDAM? For example have a single directory service (probably highly customised)? is it ...
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36 views

Security and distro list naming convention in AAD

Most naming convention standards for Active Directory I have come across so far have security groups starting with an underscore to allow the equivalent distribution list to be user-friendly. I am ...
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88 views

Windows Fine-Grained Password Policies (FGPP) - Set Policy Duration

Trying to determine if there's a way to configure an FGPP(the policy itself) to last/be enforced only for a specified period of time or ideally, until a triggering event occurs. E.g., create temp ...
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494 views

Active Directory GDPR classification

GDPR classifies data into Non-personal, Personal and Sensitive personal. Sensitive personal is further broken down to Genetic and biometric, Racial and ethnical, Religion and Philosophical etc. ...
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AD Security Group hunting

I have a problem that I have been pondering off and on for a while and I want to see if anyone has a better answer: Is there a way to see where an AD security group is used in an enterprise WITHOUT ...
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231 views

How to obtain Service Tickets (TGS) for Service Accounts with no SPNs (ServicePrincipalName) set?

The first step in a kerberoasting attack is to discover Service Accounts via AD enumeration. One way to do so is searching LDAP for any registered SPNs (Service Principal Names). However, from my ...
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128 views

Secure REST API that only works for users authenticated by App with SSO (OAuth?)

I somehow need to accomplish the following: User accesses a application written in JavaScript. Application uses SSO to identify the user who is logged into Windows. Application obtains the access ...
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229 views

How to decode kerberos tickets on wireshark? [closed]

It has been two days in a row that I spend hours trying to decrypt kerberos traffic using wireshark. For learning purposes, I want to be able to read the encrypted parts of tickets and authenticators ...
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91 views

AD user recreation, security issue

I have some users that prefer to create a new user account instead of resetting the password (or investigating why there is an issue with the account). Then delete the old account. I've personally ...
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203 views

ActiveDirectory PenTest Help [closed]

I'm popped in the middle of the domain with what appears to be a VERY solid network. Good policy, good security, a lot of the usual tactics won't work. I cant pass-the-hash, find any SYSVOL loot, or ...
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64 views

Good book detailing the security aspects of Microsoft Active Directory [closed]

I am attending training later this summer related to AD pentesting. As such, I wanted to ask for book recommendations which detail (in full or in part) the security aspects of Active Directory. The ...
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63 views

Execute internal penetration test without touching Active Directory

I'm part of a penetration testing team and part of my responsibilities for this quarter are organizing red team engagements for the rest of the year. This quarter, we've received buy-in from all org ...
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71 views

What is the logic behind Microsoft recommending that creation of “god group” / Tier -0 in their Red Forest model for AD?

Creating a Tier-0, which is basically a "God Group" in Red Forest AD model seems a bit off to me, so I was wondering about its logic.
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592 views

How to retrieve Kerberos Service tickets?

I am learning Kerberoasting see below are my steps that I am following. Step:1. Attacker will find the SPN's Step:2. After identifying we will request for TGS for that SPN. This is the script for ...
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145 views

Running jobs as local administrator vs domain administrator and their risks

I know for best practices we should always give an account least privilege and use that account to run jobs etc. However our windows jobs often require elevated privileges in order to perform the ...
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336 views

How is Privileged identity management (PIM) different from privileged access management (PAM)?

I am very confused about those two, I was trying to understand the difference but it all sounds the same from what I read online.
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449 views

Use Kerberos Golden Ticket with Metasploit

Having compromised a domain controller during testing, I now wish to create persistent domain admin access. Also, operational security is important for me as I don't want to be logging into netowkr ...
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93 views

How to intercept AD authentication attempts [closed]

My work Windows account keeps locking and the unlocking process is frustrating (you have to call the HelpDesk to request them account unlocking). They don't have any type of log and so they can't help ...
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1k views

How to crack AES-based Kerberos TGS tickets (Kerberoasting)?

All material I can find is related to RC4-based Kerberos TGS tickets, since these are easier to crack to obtain the service account's password. However, I want to attempt to crack AES-based Kerberos ...
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290 views

What is the security concerns of AzureAD?

We have lots of documents about Microsoft on-premise AD security problems and methodologies to find them and test them, but for AzureAD there is not much information about the possible problems and ...
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405 views

Getting VPN users to trust a non-global Root Certificate Authority on Windows in order to use TLS on intranet websites

Consider the following scenario, keeping in mind the restrictions: Your goal is to secure intranet-only web applications to start using https - so you need a certificate issued, so you can bind ...

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