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Created: Friday, December 24 2010 02:16.57 CST

Modified: Friday, December 24 2010 02:18.43 CST

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Using NtCreateThreadEx for Remote Thread Execution in System Process for Vista & Windows7

Author: tnagareshwar

# Views: 52921

Some times back I wrote article on using lesser known method, NTCreateThreadEx for remote thread execution. This is better alternative compared to CreateRemoteThread especially for Vista & Windows 7. As you may aware CreateRemoteThread was the popular method used for DLL Injection.

Here are some of the highlights of this technique

* Major advantage is that it can work across session boundaries while CreateRemoteThread cannot.

* User need to have sufficient privileges to perform tasks such as DLL injection using this method.

* It is UNDOCUMENTED- there is a risk but it is worth it.

This article explains everything you need to know about NtCreateThreadEx with complete code example.

Click on the below link to read the full article,

Remote Thread Execution in System Process using NtCreateThreadEx for Vista & Windows7

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Blog Comments

Genius	Posted: Friday, December 24 2010 04:46.23 CST
Informative, thanks.

skiert	Posted: Friday, December 24 2010 06:14.07 CST
I read your article some time ago, but there is a problem. You still have to open a handle to the Process and OpenProcess() fails big time on any Session0 Process, as far as I can see.. If you cannot open a Handle to the Process, you cannot use the NtCreateThreadEx() API.. So it wouldnt work!?

tnagareshwar	Posted: Monday, December 27 2010 12:09.26 CST
@Genius Thanks @skiert You need to have right privilege else everything will fail. This method makes it better over CreateRemoteThread as it cannot perform across the sessions even though you have privilege. Also you need to acquire the SeDebugPrivilege before you begin this operation.

EliCZ	Posted: Monday, December 27 2010 15:02.49 CST
RtlCreateUserThread

palaniyappan	Posted: Saturday, January 8 2011 06:40.02 CST
@skiert To debug and access foreign process memory your process must have SeDebugPrivilege. The ready made code for privilege escalation is available @ http://support.microsoft.com/kb/131065

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