Backdoor.Win32.Mellpon.b Information Disclosure

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/e499a4c359a8cc46e641f39c0ed548f9.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Mellpon.b  
Vulnerability: Remote Unauthenticated Information Disclosure  
Description: The malware listens on TCP port 80 and creates a dir named "tanaka" with a file named C.html, the HTML file contains a list of all dirs on the system and their contents. Third-party attackers who can reach an infected system can view the screen dumps taken periodically as well as view all directories and files on the system. The screen dumps are in a JPG file named "~ss.jpg" and can be accessed by URL http://x.x.x.x/~ss.jpg.  
Type: PE32  
MD5: e499a4c359a8cc46e641f39c0ed548f9  
Vuln ID: MVID-2021-0430  
Disclosure: 12/16/2021  
  
Exploit/PoC:  
1) Open a web browser to the infected host and navigate to C.html or ~ss.jpg.  
  
Screenshots of the infected host.  
http://x.x.x.x/~ss.jpg  
  
2) All files and directory contents.  
http://x.x.x.x/C.html  
  
2021/10/13 20:24 28131582 C.html  
  
../  
C:/  
2016/11/21 15:06 DIR $Recycle.Bin/  
2018/03/13 15:36 DIR Boot/  
2016/11/21 11:28 DIR Documents and Settings/  
2021/12/13 20:21 DIR dump/  
2017/12/13 20:41 DIR PerfLogs/  
2021/12/13 20:17 DIR Program Files/  
2021/10/03 20:49 DIR Program Files (x86)/  
2021/10/03 21:12 DIR ProgramData/  
2018/03/13 00:44 DIR Recovery/  
2018/03/13 00:45 DIR System Volume Information/  
2018/03/13 00:45 DIR Users/  
2021/07/07 21:14 DIR Windows/  
2018/03/01 01:53 398082 bootmgr  
2017/09/29 08:41 1 BOOTNXT  
2018/03/13 00:40 8192 BOOTSECT.BAK  
2021/10/12 21:10 671088640 pagefile.sys  
2021/10/12 21:10 16777216 swapfile.sys  
C:/$Recycle.Bin/  
  
etc...  
  
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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