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Edit Report

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022050022

Below is a copy:

Trojan-Ransom.LockerGoga / Code Execution
Discovery / credits: Malvuln - (John Page - aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/3b200c8173a92c94441cb062d38012f6.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan-Ransom.LockerGoga
Vulnerability: Code Execution
Description: LockerGoga looks for and loads a DLL named "wow64log.dll" in Windows\System32. Therefore, we can drop our own DLL to intercept and terminate the malware pre-encryption. Four processes are created E.g. "imtvknqq9737.exe" running under AppData\Local\Temp, the process name is "imtvknqq" plus a appended random number. Our exploit dll will simply display a Win32API message box and call exit(). The exploit DLL must export "InterlockedExchange" function or it fails with error. We do not need to rely on hash signature or third-party product, the malwares own flaw 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: LockerGoga
Type: PE32
MD5: 3b200c8173a92c94441cb062d38012f6
Vuln ID: MVID-2022-0587
Disclosure: 05/05/2022 
Video PoC URL: https://www.youtube.com/watch?v=1_7vmbHmCQQ

Exploit/PoC:
1) Compile the following C code as "wow64log.dll" as x64
2) Place the DLL in Windows/System32
3) Run the malware then BOOM!

#include "windows.h"

//By malvuln - 5/2022
//Target: Trojan-Ransom.LockerGoga
//MD5: 3b200c8173a92c94441cb062d38012f6
/** 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.
**/

//compile as x64
//gcc -c wow64log.c 
//gcc -shared -o wow64log.dll wow64log.o 
//DLL must live under Windows/System32 dir

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
  switch (reason) {
  case DLL_PROCESS_ATTACH:
   MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);
   exit(0);
    break;
  }
  return TRUE;
}

extern __declspec(dllexport) WINBASEAPI LONG WINAPI InterlockedExchange (LONG volatile *Target, LONG Value){
    exit(1);
}


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