|28 Apr 2013||#42|
-I have notepad set to "Run as Administrator" on both windows 7 machines
-I can write to the root C: such as copying over a .exe file or something like that. The issue is editing a text file only.
I can edit a text file on the root C drive on a windows xp machine but not any windows 7 machines across network. I am guessing i must of missed some windows 7 permissions policy some where to enable this. Now i can edit a file on windows 7 machines if it's not on the root of the drive say C:\testfolder\testfile.txt
I know that you have already done some of these steps - so just check them instead of redoing them.
Computer A = local
Computer B = remote
Disconnect any mapped drive letters that you might have between computers.
Open Credential Manager on both computer A and computer B.
On computer A, remove any reference that you see to computer B.
On computer B, remove any reference that you see to computer A.
Set LocalAccountTokenFilterPolicy to 1 on computer B.
Restart both computers see if this works:
While sitting at computer A
Map a drive letter to \\computer B\C$
(Or use a UNC type of connection.)
When asked for credentials, enter any admin account info that resides on computer B.
You should now be able to do whatever you want to a file on computer B; even if the file of interest is in the system root of computer B.
When computer A uses a connection to the admin share on computer B that type of connection acts like an elevated process. Computer B uses its own unelevated explorer.exe to allow the remote connection to SILENTLY create/edit/rename/delete/infect files in areas that normally require an elevated process to access. (Scary huh? A malware writer's dream connection.)
Files can be created locally on computer A then moved to computer B's root.
Files can be created directly in computer B's root via an unelevated process like computer A's explorer.
(via right-click > New > Text Document)
Files can be created directly in computer B's root via computer A's unelevated notepad.
(via File > Save as > navigate to computer B's root)
So, unelevated malware can do stuff to Computer B that is cannot do to computer A. But if computer B has an admin share connection to computer A, then it can use computer B to further infect computer A.
As you found out, you need an elevated process on computer B to edit a file that was created by computer A and placed directly into computer B's root. That is perfectly normal and desired. The same is true for a local file that is created in the root by an elevated process.
And just to repeat what was said in an earlier post:
You can create a file on computer B's desktop
Move it to computer B's root
And edit it without an elevated process (forgot to demo in the video).
But such a file is limited in what it can do from within the root or elsewhere.
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