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_18.104.22.16834_neutral_neutral_cw5n1h2txyewy /d "C:\windows\system32\cmd.exe" OR reg add HKCU\Software\Classes\ActivatableClasses\Package\Microsoft.Windows.Cortana_22.214.171.12434_neutral_neutral_cw5n1h2txyewy\DebugInformation\CortanaUI.AppXy7vb4pc2dr3kc93kfc509b1d0arkfb2x.mca /v DebugPath /d "C:\windows\system32\cmd.exe" … Continue reading Persistence using Universal Windows Platform apps (APPX)
Part 2 of this research can be found here: https://oddvar.moe/2018/04/11/putting-data-in-alternate-data-streams-and-how-to-execute-it-part-2/ I always had a fascination about ADS (Alternate data streams) and using it as part of a persistence. My first meeting with this as a persistence technique was when Matt Nelson aka @Enigma0x3 wrote a blogpost about using it: https://enigma0x3.net/2015/03/05/using-alternate-data-streams-to-persist-on-a-compromised-machine/ Quite recently I have started to play … Continue reading Putting data in Alternate data streams and how to execute it
TL;DR .BGI files can be sent on mail as attachment and can execute code when opened.Requires that BGinfo.exe has been run on the remote machine once. It will also bypass Outlook attachment protection (Fixed with Defense-in-depth patch from September 2017). PowerShell functions to generate BGI and VBSWebMeter here: https://github.com/api0cradle/BGInfo I was acknowledged on … Continue reading Defense-In-Depth write-up
Whenever I have a chance I use my time diving into Windows internal binaries to uncover hidden functionality. This blogpost is dedicated to things I have discovered with the CMSTP.exe binary file. I found a UAC Bypass using sendkeys and a way to load DLL files from a Webdav server. I know the bypass I … Continue reading Research on CMSTP.exe
TL;DR You can run a remote shell through ICMP. ICMP can be used for bad. Many customers have asked me this question many times, and in general ICMP (ICMP is a lot more than just ping, but is often referred to as ping for simplicity) is a nice thing to use to verify if … Continue reading Ping is okay? – Right?
Just wanted to do a quick follow-up on this bypass. Seems that BGInfo 4.22 still can be used to bypass AppLocker using the techniques I showed in my previous post. Meaning that if you use AppLocker as whitelisting solution I guess you must deny BGInfo.exe in order to prevent this bypass. Screenshots from an AppLocker … Continue reading Clarification – BGInfo 4.22 – AppLocker still vulnerable
TL;DR BGinfo.exe older than version 4.22 can be used to bypass application whitelisting using vbscript inside a bgi file. This can run directly from a webdav server. UPDATE: 22.05.2017 AppLocker is still vulnerable with Bginfo 4.22. A blogpost about that here: https://msitpros.com/?p=3860 UPDATE: 19.06.2017 Microsoft has thanked me in their documentation for this finding. The … Continue reading Bypassing Application Whitelisting with BGInfo