LockLess

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LockLess is a C# tool that allows for the enumeration of open file handles and the copying of locked files.

It was inspired by @fuzzysec's Get-Handles.ps1 and draws on code from Stackoverflow as well.

Handles are enumerated with NtQuerySystemInformation:SystemHandleInformation.

To copy out a locked file, the code:

• Opens the process that has a lock on the file with DuplicateHandle permissions.
• Uses DuplicateHandle() to duplicate the specific file handle associated with the file we're wanting to copy.
• Uses CreateFileMapping() to create a mapping of the duplicated file handle.
• Uses MapViewOfFile() to map the entire file into memory.
• Uses WriteFile() to write out the mapped contents to the temporary file specified.

LockLess is licensed under the BSD 3-Clause license.

Usage

C:\Temp\LockLess.exe

    LockLess.exe <file.ext | all> [/process:NAME1,NAME2,...] [/copy | /copy:C:\Temp\file.ext]

File out which process has a handled to the locked "WebCacheV01.dat" file:

C:\Temp>LockLess.exe WebCacheV01.dat

[*] Searching processes for an open handle to "WebCacheV01.dat"
[+] Process "taskhostw" (5332) has a file handle (ID 880) to "C:\Users\harmj0y\AppData\Local\Microsoft\Windows\WebCache\WebCacheV01.dat"

Copy the locked "WebCacheV01.dat" file to a temporary file:

C:\Temp>LockLess.exe WebCacheV01.dat /copy

[*] Searching processes for an open handle to "WebCacheV01.dat"
[+] Process "taskhostw" (5332) has a file handle (ID 880) to "C:\Users\harmj0y\AppData\Local\Microsoft\Windows\WebCache\WebCacheV01.dat"
[*] Copying to: C:\Users\harmj0y\AppData\Local\Temp\tmp18BE.tmp
[*] Copied 23068672 bytes from "C:\Users\harmj0y\AppData\Local\Microsoft\Windows\WebCache\WebCacheV01.dat" to "C:\Users\harmj0y\AppData\Local\Temp\tmp18BE.tmp"

Copy the file "WebCacheV01.dat" locked by "taskhostw" to a specific location:

C:\Temp>LockLess.exe WebCacheV01.dat /process:taskhostw /copy:C:\Temp\out.tmp

[*] Searching processes for an open handle to "WebCacheV01.dat"
[+] Process "taskhostw" (9668) has a file handle (ID 892) to "C:\Users\harmj0y\AppData\Local\Microsoft\Windows\WebCache\WebCacheV01.dat"
[*] Copying to: C:\Temp\out.tmp
[*] Copied 23068672 bytes from "C:\Users\harmj0y\AppData\Local\Microsoft\Windows\WebCache\WebCacheV01.dat" to "C:\Temp\out.tmp"

Enumerate all open handles, outputting as a CSV:

C:\Temp>LockLess.exe all

ProcessName,ProcessID,FileHandleID,FileName
Code,4740,64,C:\Users\harmj0y\AppData\Local\Programs\Microsoft VS Code
...(snip)...

Compile Instructions

We are not planning on releasing binaries for LockLess, so you will have to compile yourself :)

LockLess has been built against .NET 3.5 and is compatible with Visual Studio 2019 Community Edition. Simply open up the project .sln, choose "release", and build.