Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source:  
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:  
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  
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, "Ransom Lockbit 3.0 aka LockShit\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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