Ransom.REvil MVID-2022-0600 Code Execution ≈ Packet Storm

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  Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/daab2c9d58acc367032f32bb8097e310.txt
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Media: twitter.com/malvuln
Threat: Ransom.REvil
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: daab2c9d58acc367032f32bb8097e310
Vuln ID: MVID-2022-0600
Disclosure: 05/12/2022
1) Compile the following C code as "winhttp.dll" 32-bit
2) Place the DLL in same directory as the ransomware
3) Optional - Hide it: attrib +s +h "winhttp.dll"
4) Run the malware
#include "windows.h"
//By malvuln
//gcc -c winhttp.c -m32
//gcc -shared -o winhttp.dll winhttp.o -m32
//Purpose: Exploit REvil
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.
BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
switch (reason) {
MessageBox(NULL, "REvil\nPWNED By MALVULN", "Code Exec PoC", 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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Pensée du jour :

Ce que l'homme a fait ,

l'homme peut le défaire.


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