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Date: Tue, 3 May 2022 09:01:22 -0400
From: malvuln <>
Subject: [FD] REvil Ransom / Code Execution

Discovery / credits: Malvuln - (c) 2022
Original source:

Threat: REvil Ransom
Vulnerability: Code Execution
Description: REvil looks for and executes DLLs in its current
directory. Therefore, we can potentially hijack a vuln DLL execute our
own code, control and terminate the malware pre-encryption. The
exploit dll will check 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 signature or third-party product, the
malwares own vulnerability 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: REvil
Type: PE32
MD5: 7d7ee58c2696794b3be958b165eb61a9
Vuln ID: MVID-2022-0577
Disclosure: 05/03/2022
Video PoC URL:

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

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

//By malvuln
//Purpose: Code Execution
//Target: REvi Ransomware
//MD5: 7d7ee58c2696794b3be958b165eb61a9
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

//gcc -c CLDAPI.c -m32
//gcc -shared -o CLDAPI.dll CLDAPI.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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