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## https://sploitus.com/exploit?id=PACKETSTORM:166942
Discovery / credits: Malvuln - malvuln.com (c) 2022  
Original source: https://malvuln.com/advisory/710a77804637f65e22a2e230ff6444f9.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Conti.Ransom  
Vulnerability: Code Execution  
Description: Conti 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 pre-encryption. The exploit dll will simply display a Win32API message box and call exit(). Our Conti.Ransom 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 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: Conti  
Type: PE32  
MD5: 710a77804637f65e22a2e230ff6444f9  
SHA256: 0aaacd11d8b956d317489d060e72946d28ab6aef9be1b541aff9904a750f4b51  
Vuln ID: MVID-2022-0579  
Disclosure: 05/03/2022  
Video PoC URL: https://www.youtube.com/watch?v=owsev3YTkWA  
  
Exploit/PoC:  
1) Compile the following C code as "wow64log.dll" as x64  
2) Copy the DLL in Windows/System32  
3) Run the malware and BOOM!  
  
#include "windows.h"  
#include "stdio.h"  
  
//By malvuln - 5/2022  
//MD5: 710a77804637f65e22a2e230ff6444f  
//TARGET: Conti.Ransom  
/** 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.  
**/  
  
//gcc -c wow64log.c   
//gcc -shared -o wow64log.dll wow64log.o   
//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);  
}  
  
  
Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).