如何使用WFH搜索Windows可执行程序中的常见漏洞或功能

关于WFH
WFH,全名为Windows Feature Hunter,即Windows功能搜索工具,该工具基于Python开发,使用Frida实现其功能,可以帮助广大研究人员搜索和识别Windows可执行程序中的常见安全漏洞以及功能。当前版本的WFH能够自动识别动态链接库DLL中潜在的侧加载问题以及组件对象模型COM中劫持攻击的实现可能。

DLL侧加载利用勒Windows中WinSXS程序集来从SXS列表中加载恶意DLL文件。COM劫持将允许攻击者置入恶意代码,而这些代码将能够通过劫持COM引用和关系代替合法软件的执行。

WFH可以输出潜在的安全漏洞,并将目标Windows可执行文件中的潜在漏洞相关信息写入至CSV文件中。

工具安装
首先, 广大研究人员需要使用下列命令将该项目源码克隆至本地:

git clone https://github.com/ConsciousHacker/WFH
然后运行下列命令安装和配置相关依赖组件:

pip install -r requirements.txt
工具帮助信息
PS C:\Tools\WFH > python .\wfh.py -h

usage: wfh.py [-h] -t T [T …] -m {dll,com} [-v] [-timeout TIMEOUT]

Windows Feature Hunter

optional arguments:

-h, –help show this help message and exit

-t T [T …], -targets T [T …]

list of target windows executables

-m {dll,com}, -mode {dll,com}

vulnerabilities to potentially identify

-v, -verbose verbose output from Frida instrumentation

-timeout TIMEOUT timeout value for Frida instrumentation

EXAMPLE USAGE

NOTE: It is recommended to copy target binaries to the same directory as wfh for identifying DLL Sideloading

DLL Sideloading Identification (Single): python wfh.py -t .\mspaint.exe -m dll

DLL Sideloading Identification (Verbose): python wfh.py -t .\mspaint.exe -m dll -v

DLL Sideloading Identification (Timeout 30s): python wfh.py -t .\mspaint.exe -m dll -timeout 30

DLL Sideloading Identification (Wildcard): python wfh.py -t * -m dll

DLL Sideloading Identification (List): python wfh.py -t .\mspaint.exe .\charmap.exe -m dll

COM Hijacking Identification (Single): python wfh.py -t “C:\Program Files\Internet Explorer\iexplore.exe” -m com

COM Hijacking Identification (Verbose): python wfh.py -t “C:\Program Files\Internet Explorer\iexplore.exe” -m com -v

COM Hijacking Identification (Timeout 60s): python wfh.py -t “C:\Program Files\Internet Explorer\iexplore.exe” -m com -timeout 60

COM Hijacking Identification (Wildcard): python wfh.py -t * -m com -v

COM Hijacking Identification (List): python wfh.py -t “C:\Program Files\Internet Explorer\iexplore.exe” “C:\Windows\System32\notepad.exe” -m com -v
工具使用
DLL侧加载识别
首先,我们需要将需要分析的代码拷贝至WFH工具所在的目录下,然后按照下列命令执行扫描分析:

PS C:\Tools\WFH > copy C:\Windows\System32\mspaint.exe .

PS C:\Tools\WFH > copy C:\Windows\System32\charmap.exe .

PS C:\Tools\WFH > dir

Directory: C:\Tools\WFH

Mode LastWriteTime Length Name

—- ————- —— —-

d—– 5/14/2021 2:12 PM .vscode

-a—- 5/6/2021 2:39 PM 1928 .gitignore

-a—- 12/7/2019 2:09 AM 198656 charmap.exe

-a—- 5/18/2021 7:39 AM 6603 loadlibrary.js

-a—- 4/7/2021 12:48 PM 988160 mspaint.exe

-a—- 5/18/2021 7:53 AM 8705 README.md

-a—- 5/17/2021 11:27 AM 5948 registry.js

-a—- 5/6/2021 2:41 PM 11 requirements.txt

-a—- 5/18/2021 8:35 AM 10623 wfh.py
接下来,我们就可以使用WFH来对目标代码进行分析,并尝试识别其中的DLL侧加载机会:

PS C:\Tools\WFH > python .\wfh.py -t * -m dll

==================================================

Running Frida against charmap.exe

————————————————–

[+] Potential DllMain Sideloading: LoadLibraryW,LPCWSTR: MSFTEDIT.DLL

[+] Potential DllMain Sideloading: LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE

[*] Writing raw Frida instrumentation to charmap.exe-raw.log

[*] Writing Potential DLL Sideloading to charmap.exe-sideload.log

————————————————–

==================================================

Running Frida against mspaint.exe

————————————————–

[+] Potential DllMain Sideloading: LoadLibraryExW,LPCWSTR : gdiplus.dll, dwFlags : NONE

[-] Potential DllExport Sideloading: GetProcAddress,hModule : C:\WINDOWS\WinSxS\amd64_microsoft.windows.gdiplus_6595b64144ccf1df_1.1.19041.789_none_faf0a7e97612e7bb\gdiplus.dll, LPCSTR: GdiplusStartup

[+] Potential DllMain Sideloading: LoadLibraryW,LPCWSTR: MSFTEDIT.DLL

[+] Potential DllMain Sideloading: LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE

[*] Writing raw Frida instrumentation to mspaint.exe-raw.log

[*] Writing Potential DLL Sideloading to mspaint.exe-sideload.log

————————————————–

==================================================

[*] Writing dll results to dll_results.csv

PS C:\Tools\WFH > type .\dll_results.csv

Executable,WinAPI,DLL,EntryPoint / WinAPI Args

charmap.exe,LoadLibraryW,LPCWSTR: MSFTEDIT.DLL

charmap.exe,LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE

mspaint.exe,LoadLibraryExW,LPCWSTR : gdiplus.dll, dwFlags : NONE

mspaint.exe,GetProcAddress,hModule : C:\WINDOWS\WinSxS\amd64_microsoft.windows.gdiplus_6595b64144ccf1df_1.1.19041.789_none_faf0a7e97612e7bb\gdiplus.dll, LPCSTR: GdiplusStartup

mspaint.exe,LoadLibraryW,LPCWSTR: MSFTEDIT.DLL

mspaint.exe,LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE
如果你想让WFH输出更多详细内容,可以使用“-v”参数开启Verbose模式。此时将能够查看Windows API调用的详细情况:

PS C:\Tools\WFH > python .\wfh.py -t * -m dll -v

==================================================

Running Frida against charmap.exe

{‘type’: ‘send’, ‘payload’: ‘LoadLibraryW,LPCWSTR: MSFTEDIT.DLL’}

{‘type’: ‘send’, ‘payload’: ‘LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE’}

————————————————–

[+] Potential DllMain Sideloading: LoadLibraryW,LPCWSTR: MSFTEDIT.DLL

[+] Potential DllMain Sideloading: LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE

[*] Writing raw Frida instrumentation to charmap.exe-raw.log

[*] Writing Potential DLL Sideloading to charmap.exe-sideload.log

————————————————–

==================================================

Running Frida against mspaint.exe

{‘type’: ‘send’, ‘payload’: ‘LoadLibraryExW,LPCWSTR : gdiplus.dll, dwFlags : NONE’}

{‘type’: ‘send’, ‘payload’: ‘GetProcAddress,hModule : C:\\WINDOWS\\WinSxS\\amd64_microsoft.windows.gdiplus_6595b64144ccf1df_1.1.19041.789_none_faf0a7e97612e7bb\\gdiplus.dll, LPCSTR: GdiplusStartup’}

{‘type’: ‘send’, ‘payload’: ‘LoadLibraryW,LPCWSTR: MSFTEDIT.DLL’}

{‘type’: ‘send’, ‘payload’: ‘LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE’}

————————————————–

[+] Potential DllMain Sideloading: LoadLibraryExW,LPCWSTR : gdiplus.dll, dwFlags : NONE

[-] Potential DllExport Sideloading: GetProcAddress,hModule : C:\WINDOWS\WinSxS\amd64_microsoft.windows.gdiplus_6595b64144ccf1df_1.1.19041.789_none_faf0a7e97612e7bb\gdiplus.dll, LPCSTR: GdiplusStartup

[+] Potential DllMain Sideloading: LoadLibraryW,LPCWSTR: MSFTEDIT.DLL

[+] Potential DllMain Sideloading: LoadLibraryExW,LPCWSTR : MSFTEDIT.DLL, dwFlags : NONE

[*] Writing raw Frida instrumentation to mspaint.exe-raw.log

[*] Writing Potential DLL Sideloading to mspaint.exe-sideload.log

————————————————–

==================================================

[*] Writing dll results to dll_results.csv
COM劫持识别
PS C:\Tools\WFH > python .\wfh.py -t “C:\Program Files\Internet Explorer\iexplore.exe” -m com

==================================================

Running Frida against C:\Program Files\Internet Explorer\iexplore.exe

————————————————–

[+] Potential COM Hijack: Path : HKEY_LOCAL_MACHINE\Software\Classes\CLSID\{0E5AAE11-A475-4C5B-AB00-C66DE400274E}\InProcServer*32,lpValueName : null,Type : REG_EXPAND_SZ, Value : %SystemRoot%\system32\Windows.Storage.dll

[+] Potential COM Hijack: Path : HKEY_CLASSES_ROOT\CLSID\{1FD49718-1D00-4B19-AF5F-070AF6D5D54C}\InProcServer*32,lpValueName : null,Type : REG_SZ, Value : C:\Program Files (x86)\Microsoft\Edge\Application\90.0.818.62\BHO\ie_to_edge_bho_64.dll

[*] Writing raw Frida instrumentation to .\iexplore.exe-raw.log

[*] Writing Potential COM Hijack to .\iexplore.exe-comhijack.log

————————————————–

==================================================

[*] Writing dll results to comhijack_results.csv
工具使用样例
原生Windows签名代码
将所有的原生Windows签名代码拷贝至WFH脚本所在目录:

Get-ChildItem c:\ -File | ForEach-Object { if($_ -match ‘.+?exe$’) {Get-AuthenticodeSignature $_.fullname} } | where {$_.IsOSBinary} | ForEach-Object {Copy-Item $_.path . }
搜索DLL侧加载机会
python wfh.py -t * -m dll
搜索COM劫持机会
python wfh.py -t * -m com
项目地址
WFH:【GitHub传送门】

本文作者:Alpha_h4ck, 转载请注明来自FreeBuf.COM