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);  
}  
  
  
Disclaimer: The information contained within this advisory is supplied  
"as-is" with no warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and that due  
credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit is given to  
the author. The author is not responsible for any misuse of the information  
contained herein and accepts no responsibility for any damage caused by the  
use or misuse of this information. The author prohibits any malicious use  
of security related information or exploits by the author or elsewhere. Do  
not attempt to download Malware samples. The author of this website takes  
no responsibility for any kind of damages occurring from improper Malware  
handling or the downloading of ANY Malware mentioned on this website or  
elsewhere. All content Copyright (c) Malvuln.com (TM).  
  
`