While I was prepping for a session a while back I made a a little special discovery about AppLocker. Turns out that the files that AppLocker uses under C:\Windows\System32\AppLocker can be used in many cases to bypass a Default AppLocker ruleset. When a machine is deployed and the first user logs in, that user will … Continue reading A small discovery about AppLocker
Tag: research
Bypassing AppLocker as an admin
I thought it would be useful to have a blog post about two different techniques you can use to bypass AppLocker if you are an admin on a host that has AppLocker enabled. The first technique that uses the GUI was briefly discussed in a tweet I posted a while back: https://twitter.com/Oddvarmoe/status/996147947975962624 My goal with this … Continue reading Bypassing AppLocker as an admin
%Temp%orary Constrained Language mode in AppLocker
TL;DR Done as a normal user without admin privs Change %TEMP%/%TMP% to point to a location that allows execution of scripts defined by AppLocker Start Powershell with the new environment variables that you set for %TEMP%/%TMP% and profit! Background This blogpost covers a technique I discovered when digging further into AppLocker to bypass Powershell Constrained … Continue reading %Temp%orary Constrained Language mode in AppLocker
Persistence using Universal Windows Platform apps (APPX)
TL;DR Persistence can be achieved with Appx/UWP apps using the debugger options. This technique will not be visible by Autoruns. Two different approaches exists (registry keys). Listed below are the two techniques for two different apps that starts at logon: Cortana app: reg add HKCU\Software\Microsoft\Windows\CurrentVersion\PackagedAppXDebug\Microsoft.Windows.Cortana_1.10.7.17134_neutral_neutral_cw5n1h2txyewy /d "C:\windows\system32\cmd.exe" OR reg add HKCU\Software\Classes\ActivatableClasses\Package\Microsoft.Windows.Cortana_1.10.7.17134_neutral_neutral_cw5n1h2txyewy\DebugInformation\CortanaUI.AppXy7vb4pc2dr3kc93kfc509b1d0arkfb2x.mca /v DebugPath /d "C:\windows\system32\cmd.exe" … Continue reading Persistence using Universal Windows Platform apps (APPX)
Another way to get to a system shell – Assistive Technology
TL;DR Manipulate HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs\magnifier - StartExe to run other binary when pressing WinKey and plus to zoom. Can load binary from Webdav and also start webbrowser and browse to desired link Runs command as system during UAC prompt and logon screen I have thought a while about this blogpost and finally had some time to … Continue reading Another way to get to a system shell – Assistive Technology
Real whitelisting attempt using AppLocker
I wanted to try and see if I was able to use AppLocker to only allow needed files (Real whitelisting). Normally what you would do when setting up AppLocker is that you would start out by trusting something. This something could either be everything under C:\windows and c:\programfiles, or it could be every file that … Continue reading Real whitelisting attempt using AppLocker
GPscript.exe – another LOLBin to the list
TL;DR - GPO scripts can be defined for user and started with GPScript.exe /Logon - Logonscripts do not show up in Autoruns.exe I started to play around with GPscript.exe here the other day and found some interesting stuff and I want to have this documented for the future, so therefor I wrote this blogpost … Continue reading GPscript.exe – another LOLBin to the list
Putting data in Alternate data streams and how to execute it – part 2
I wrote a blogpost a while back about Alternate data streams that you can find here: https://oddvar.moe/2018/01/14/putting-data-in-alternate-data-streams-and-how-to-execute-it/ After I wrote that post I have made some new discoveries that I wanted to share around Alternate data streams. As you probably already know if you read some of my stuff is that I am a big fan … Continue reading Putting data in Alternate data streams and how to execute it – part 2
Persistence using GlobalFlags in Image File Execution Options – Hidden from Autoruns.exe
TL;DR – Found a technique to execute any binary file after another application is closed without being detected by Autoruns.exe. – Requires administrator rights and does not belong in userland. – Can also be executed from alternate data streams – Plant file on disk and run these commands to create persistence that triggers everytime someone … Continue reading Persistence using GlobalFlags in Image File Execution Options – Hidden from Autoruns.exe
Persistence using RunOnceEx – Hidden from Autoruns.exe
TL;DR - Found a technique to execute DLL files without being detected by autoruns.exe at logon. - Requires administrator rights and does not belong in userland. - Run this to Exploit: reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnceEx\0001\Depend /v 1 /d "C:\temp\messageBox64.dll" RunOnceEx I finally had some time to do some unstructured research. With unstructured research I mean going after … Continue reading Persistence using RunOnceEx – Hidden from Autoruns.exe
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