Ransom Lockbit 3.0 MVID-2022-0621 Code Execution

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/38745539b71cf201bb502437f891d799_B.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Ransom Lockbit 3.0   
Vulnerability: Code Execution  
Description: The ransomware apparently now requires a password to execute as noted by "@vxunderground" E.g. "-pass db66023ab2abcb9957fb01ed50cdfa6a". Lockbit looks for and executes DLLs in its current directory. Therefore, we can hijack a vuln DLL in this case "RstrtMgr.dll", execute our own code 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. All basic tests were conducted successfully in a virtual machine environment.  
Family: Lockbit  
Type: PE32  
MD5: 38745539b71cf201bb502437f891d799  
Vuln ID: MVID-2022-0621  
Disclosure: 07/04/2022  
Video PoC URL: https://www.youtube.com/watch?v=tAXrRcsnzjY  
  
Exploit/PoC:  
1) Compile the following C code as "RstrtMgr.dll"  
2) Place the DLL in same directory as Lockbit 3.0  
3) Optional - Hide it: attrib +s +h "RstrtMgr.dll"  
4) Run Lockbit 3.0 {04830965-76E6-6A9A-8EE1-6AF7499C1D08}.exe -k LocalServiceNetworkRestricted -pass db66023ab2abcb9957fb01ed50cdfa6a  
  
  
#include "windows.h"  
  
//By malvuln - 7/4/2022  
//Purpose: RCE in Lockbit 3.0 ransomware  
//MD5: 38745539b71cf201bb502437f891d799  
//gcc -c RstrtMgr.c -m32  
//gcc -shared -o RstrtMgr.dll RstrtMgr.o -m32  
/** 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.  
**/  
BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){  
switch (reason) {  
case DLL_PROCESS_ATTACH:  
MessageBox(NULL, "Ransom Lockbit 3.0 aka LockShit\nPWNED by Malvuln", "Code Exec PoC", MB_OK);  
TCHAR buf[MAX_PATH];  
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);  
CloseHandle(handle);  
}  
}  
break;  
}  
return TRUE;  
}  
  
  
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`