Discovery / credits: Malvuln - (John Page aka hyp3rlinx) (c) 2022  
Original source:  
ISR: ApparitionSec  
Threat: Ransom.WannaCry  
Vulnerability: Code Execution  
Description: WannaCry looks for and executes DLLs in its current directory. Therefore, we can hijack a vuln DLL, execute our own code, control and terminate the malware pre-encryption. The exploit dll checks if the current directory is "C:\Windows\System32", if not we grab our process ID and terminate. We do not need to rely on hash signatures or third-party products, the malwares flaw does the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as there's nothing to kill the DLL just lives on disk waiting. From a 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: WannaCry  
Type: PE32  
MD5: 84c82835a5d21bbcf75a61706d8ab549  
Vuln ID: MVID-2022-0582  
Disclosure: 05/03/2022  
Video PoC URL:  
1) Compile the following C code as "MSVCP60.dll" 32bit  
2) Place the DLL in same directory as the ransomware  
3) Optional - Hide it: attrib +s +h "MSVCP60.dll"  
4) Run the malware  
#include "windows.h"  
//By malvuln  
//Purpose: Code Execution - Block Encryption  
//Target: Ransom.WannaCry  
//MD5: 84c82835a5d21bbcf75a61706d8ab549  
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 MSVCP60.c -m32  
//gcc -shared -o MSVCP60.dll MSVCP60.o -m32  
BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){  
switch (reason) {  
MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);  
GetCurrentDirectory(MAX_PATH, TEXT(buf));  
int rc = strcmp("C:\\Windows\\System32", TEXT(buf));  
if(rc != 0){  
HANDLE handle = OpenProcess(PROCESS_TERMINATE, FALSE, getpid());  
if (NULL != handle) {   
TerminateProcess(handle, 0);  
return TRUE;  
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