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Date: Mon, 4 Jul 2022 21:57:55 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Ransom Lockbit 3.0 / Code Execution

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/38745539b71cf201bb502437f891d799_B.txt
Contact: malvuln13@...il.com
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;
}

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).
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