Conti Ransom / Code Execution

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/9eb9197cd58f4417a27621c4e1b25a71.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Conti Ransom
Vulnerability: Code Execution
Description: Conti 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: Conti
Type: PE32
MD5: 9eb9197cd58f4417a27621c4e1b25a71
Vuln ID: MVID-2022-0576
Disclosure: 05/03/2022
Video PoC URL: https://www.youtube.com/watch?v=Sb2fKCOSoew

Exploit/PoC:
1) Compile the following C code as "netapi32.dll"
2) Place the DLL in same directory as the ransomware
3) Optional - Hide it: attrib +s +h "netapi32.dll"
4) Run Conti

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

//By malvuln
//Purpose: Code Execution
//Target: Conti Ransomware
//MD5: 9eb9197cd58f4417a27621c4e1b25a71
/** DISCLAIMER:
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 netapi32.c -m32
//gcc -shared -o netapi32.dll netapi32.o -m32

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
  switch (reason) {
  case DLL_PROCESS_ATTACH:
   MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);
   TCHAR buf[MAX_PATH];
   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);
       CloseHandle(handle);
     }
   }
    break;
  }
  return TRUE;
}


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