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REvil.Ransom / Code Execution
Discovery / credits: Malvuln - (John Page - aka hyp3rlinx) (c) 2022
Original source:
Contact: [email protected]

Threat: REvil.Ransom
Vulnerability: Code Execution
Description: REvil 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: REvil
Type: PE32
MD5: 4c5c1731481ea8d67ef6076810c49e00
Vuln ID: MVID-2022-0583
Disclosure: 05/05/2022
Video PoC URL:

1) Compile the following C code as "urlmon.dll" 32bit
2) Place the DLL in same directory as the ransomware
3) Optional - Hide it: attrib +s +h "urlmon.dll"
4) Run the malware

#include "windows.h"

//By malvuln - 5/5/2022
//gcc -c urlmon.c -m32
//gcc -shared -o urlmon.dll urlmon.o -m32

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
  switch (reason) {
   MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);
   if(GetCurrentDirectory(MAX_PATH, buf))
   if(strcmp("c:\\Windows\\system32", buf) != 0){
    HANDLE handle = OpenProcess(PROCESS_TERMINATE, FALSE, getpid());
     if (NULL != handle) {   
        TerminateProcess(handle, 0);
  return TRUE;

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