Recently at the PowerShell Summit, Lee Holmes and I did a talk on PowerShell security. One of the demonstrations we did showed how to find and exploit a command injection bug in a constrained runspace. I figured I’d write a…
In this article I will introduce a new script, Inject-LogonCredentials, that uses PowerShell (specifically, the Invoke-ReflectivePEInjection script) to inject credentials in memory. I’ll start with a brief review of the current commonly used methods of using stolen credentials. Doing a…
This post will discuss bringing incognito-like functionality to PowerShell in the form of a new PowerShell script (Invoke-TokenManipulation), with some important differences. I’ll split this post up in to three sections: An overview on tokens and Windows authentication An overview…
Last week, Mubix published a malicious Windows password filter DLL (http://carnal0wnage.attackresearch.com/2013/09/stealing-passwords-every-time-they.html). The idea is simple, by installing this password filter, he can intercept the clear text credential whenever a user changes their password. There are two caveats with installing this…
PowerShell exposes a powerful set of functionality and is increasing in popularity for server management tasks. This post aims to help penetration testers identify issues that may be found when PowerShell scripts handle user input. There are multiple scenarios where…
Currently there are a few ways to dump Active Directory and local password hashes. Until recently, the techniques I had seen used to get the hashes either relied on injecting code in to LSASS or using the Volume Shadow Copy…
Recently I have been working on reflective DLL injection in to remote processes in PowerShell. I encountered a problem; I need to call LoadLibrary to load libraries in the remote process and then call GetProcAddress to get function addresses in…
This is a follow up to my article about reflectively loading DLLs using PowerShell. This will walk you through the relatively simple process of modifying mimikatz to be loadable using the reflective DLL loader to dump passwords. I’ve included a…
Normally when you load a DLL in Windows, you call LoadLibrary. LoadLibrary takes the file path of a DLL and loads it in to memory. In addition to the DLL being on disk, the DLL will show up when tools…
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