Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/0adb0e2ac8aa969fb088ee95c4a91536.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: RedLine.Stealer
Vulnerability: Code Execution
Description: RedLine looks for and loads a DLL named "wow64log.dll" in Windows\System32. Therefore, we can drop our own DLL to intercept and terminate the malware. The exploit dll will simply display a Win32API message box and call exit(). Our RedLine exploit DLL must export "InterlockedExchange" function or it fails with error. We do not need to rely on hash signature or third-party product, the malware vuln will do the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as theres nothing to kill the DLL just lives on disk waiting. From defensive perspective you can add the DLLs to a specific network share containing important data as a layered approach. All basic tests were conducted successfully in a virtual machine environment.
Family: RedLine
Type: PE32
MD5: 0adb0e2ac8aa969fb088ee95c4a91536
Vuln ID: MVID-2022-0578

Exploit/PoC:
Video PoC URL: https://www.youtube.com/watch?v=HQ2JTyckZpo

Exploit/PoC:
1) Compile the following C code as "wow64log.dll" as x64
2) Copy the DLL to Windows/System32
3) Run the malware and BOOM!

#include "windows.h"
#include "stdio.h"

//By malvuln - 5/2022
//Target: RedLine Stealer
//MD5: 0adb0e2ac8aa969fb088ee95c4a91536
/** DISCLAIMER:
Author is NOT responsible for any damages whatsoever by using this software or improper malware
handling. By using this code you assume and accept all risk implied or otherwise.
**/

//compile as x64
//gcc -c wow64log.c 
//gcc -shared -o wow64log.dll wow64log.o 
//DLL must live under Windows/System32 dir

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
  switch (reason) {
  case DLL_PROCESS_ATTACH:
   MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);
   exit(0);
    break;
  }
  return TRUE;
}

extern __declspec(dllexport) WINBASEAPI LONG WINAPI InterlockedExchange (LONG volatile *Target, LONG Value){
    exit(1);
}


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