Aug 11 2017
Microsoft provided several Active Directory PowerShell cmdlets with Windows Server 2008 R2 (and newer) which greatly simplify tasks which previously required putting together lengthy lines of code involving ADSI. On a Windows client, install the Remote Sever Administration Tools (RSAT) and ensure the Active Directory PowerShell module is installed. On a Windows server (2008 R2 …
Sep 27 2016
This post is a collection of my favorite and interesting talks from DerbyCon 6 (2016). There were a lot of great talks and as I discover them, I’ll add them here. My goal is to collect and provide the talk videos and slides together for a single, easy reference. I’m sure I missed a few. …
Jul 06 2016
This August at DEF CON 24, I will be speaking about Active Directory security evaluation in my talk “Beyond the MCSE: Red Teaming Active Directory”. This talk is focused on the Red side of AD security, specifically how to best evaluate the security of AD and quickly identify potential security issues. Whether you perform “Red …
Apr 24 2016
This was my second year speaking at BSides Charm in Baltimore. Last year I spoke about Active Directory attack & defense and it was my first time speaking at a conference. 🙂 The presentation slides for my talk “PowerShell Security: Defending the Enterprise from the Latest Attack Platform” are now on the Presentations tab here …
Dec 31 2015
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 …
Nov 22 2015
The two key goals of any attack is access and persistence. This post covers elements of each. In a post-exploitation scenario where the attacker has compromised the domain or an account with delegated rights, it’s possible to dump the clear-text passwords of admins without being a Domain Admin*. This method requires the Active Directory Domain …
Sep 16 2015
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 5 minutes. I presented on this AD persistence method in Las Vegas at DEF CON 23 (2015). Complete list of Sneaky Active Directory Persistence Tricks posts The Security …
Aug 07 2015
At my talk at Black Hat USA 2015, I highlighted new Golden Ticket capability in Mimikatz (“Enhanced Golden Tickets”). This post provides additional detailed on “enhanced” Golden Tickets. Over the past few months, I researched how SID History can be abused in modern enterprises. As part of this research, I reached out to Benjamin Delpy, …
Nov 17 2014
PowerShell provides an easy method for Base64 encoding and decoding. Encoding: $Text = ‘This is a secret and should be hidden’ $Bytes = [System.Text.Encoding]::Unicode.GetBytes($Text) $EncodedText =[Convert]::ToBase64String($Bytes) $EncodedText The result is this base64 encoded text: VABoAGkAcwAgAGkAcwAgAGEAIABzAGUAYwByAGUAdAAgAGEAbgBkACAAcwBoAG8AdQBsAGQAIABiAGUAIABoAGkAZABlAG4A Decoding: Decoding the base64 encoded blob using PowerShell is simple. $EncodedText = “VABoAGkAcwAgAGkAcwAgAGEAIABzAGUAYwByAGUAdAAgAGEAbgBkACAAcwBoAG8AdQBsAGQAIABiAGUAIABoAGkAZABlAG4A” $DecodedText = [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($EncodedText)) $DecodedText
Nov 16 2014
Today I Learned (TIL) that the best way to find all users in Active Directory via LDAP query is to search for: (samAccountType=805306368) and NOT: (&(objectClass=user)(objectCategory=person)) Reference: http://www.selfadsi.org/extended-ad/search-user-accounts.htm
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