Discovery / credits: Malvuln - (c) 2022  
Original source:  
Threat: BlackBasta Ransom  
Vulnerability: Code Execution  
Description: BlackBasta 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 BlackBasta 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: BlackBasta  
Type: PE32  
MD5: 998022b70d83c6de68e5bdf94e0f8d71  
Vuln ID: MVID-2022-0574  
Disclosure: 05/02/2022  
Video PoC URL:  
1) Compile the following C code as "wow64log.dll" as x64  
2) Place the DLL in Windows/System32  
3) Run the malware and BOOM!  
#include "windows.h"  
#include "stdio.h"  
//By malvuln - 5/2022  
//Target: BlackBasta Ransom  
//MD5: 998022b70d83c6de68e5bdf94e0f8d71  
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) {  
MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);  
return TRUE;  
extern __declspec(dllexport) WINBASEAPI LONG WINAPI InterlockedExchange (LONG volatile *Target, LONG Value){  
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