Tag: SilverTicket

Mar 09

Sneaky Active Directory Persistence #16: Computer Accounts & Domain Controller Silver Tickets

The content in this post describes a method by which an attacker could persist administrative access to Active Directory after having Domain Admin level rights for about 5 minutes. All posts in my Sneaky Active Directory Persistence Tricks series This post explores how an attacker could leverage computer account credentials to persist in an enterprise …

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Jan 05

Mimikatz Update Fixes Forged Kerberos Ticket Domain Field Anomaly – Golden Ticket Invalid Domain Field Event Detection No Longer Works

In late 2014, I discovered that the domain field in many events in the Windows security event log are not properly populated when forged Kerberos tickets are used. The key indicator is that the domain field is blank or contains the FQDN instead of the short (netbios) name and depending on the tool used to …

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Dec 31

Cracking Kerberos TGS Tickets Using Kerberoast – Exploiting Kerberos to Compromise the Active Directory Domain

Microsoft’s Kerberos implementation in Active Directory has been targeted over the past couple of years by security researchers and attackers alike. The issues are primarily related to the legacy support in Kerberos when Active Directory was released in the year 2000 with Windows Server 2000. This legacy support is enabled when using Kerberos RC4 encryption …

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Nov 17

How Attackers Use Kerberos Silver Tickets to Exploit Systems

Usually Golden Tickets (forged Kerberos TGTs) get all the press, but this post is about Silver Tickets and how attackers use them to exploit systems. I have talked about how Silver Tickets can be used to persist and even re-exploit an Active Directory enterprise in presentations at security conferences this year. This post continues this …

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Sep 26

Sneaky Active Directory Persistence Tricks

The content in this post links to several methods through which an attacker could persist administrative access to Active Directory after having Domain Admin level rights for 5 minutes. While there are an infinite number of actions an attacker can perform after compromising an enterprise, there are a finite number of pathways. In this series, …

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Aug 02

DEF CON 23 (2015) Red vs Blue: Modern Active Directory Attacks & Defense Talk Detail

This week at DEF CON 23, I will be speaking about Active Directory attack & defense in my talk “Red vs Blue: Modern Active Directory Attacks & Defense”. This is the 4th iteration of this talk and includes the latest updates to attack methods and defensive strategies.This DEF CON version has a new segment I …

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Jul 26

Black Hat USA 2015 Red vs Blue Active Directory Attack & Defense Talk Detail

Next week at Black Hat USA 2015, I will be speaking about Active Directory attack & defense in my talk “Red vs Blue: Modern Active Directory Attacks Detection and Protection”. This is the 3rd iteration of this talk and includes the latest updates to attack methods and defensive strategies. I’m including lots of updates and …

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May 03

Detecting Forged Kerberos Ticket (Golden Ticket & Silver Ticket) Use in Active Directory

Over the last 6 months, I have been researching forged Kerberos tickets, specifically Golden Tickets, Silver Tickets, and TGTs generated by MS14-068 exploit code (a type of Golden Ticket). I generated forged Kerberos tickets using Mimikatz (Mimikatz Command Reference) and MS14-068 exploits and logged the results. Over the course of several weeks, I identified anomalies …

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Nov 22

Mimikatz and Active Directory Kerberos Attacks

NOTE: While this page will remain, the majority of the Mimikatz information in this page is now in the “Unofficial Mimikatz Guide & Command Reference” which will be updated on a regular basis. Mimikatz is the latest, and one of the best, tool to gather credential data from Windows systems. In fact I consider Mimikatz …

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