Compromised uTorrent clients can be abused to download a malicious torrent file. The malicious file is designed to embed a persistent backdoor and execute when Windows 10 reboots, granting the attacker remote access to the operating system at will.
Torrent clients like uTorrent and Transmission have built-in features that allow server administrators to remotely access the torrent client via web application interfaces, as shown in the below image example of uTorrent's web app.
Windows 8 Pro Keygen Torrent Hit
Overall, the number of publicly accessible torrent clients is growing. As torrent clients increase in popularity, so does the number of poorly configured and insecure services. Like all web apps, these clients can be hacked in various ways. For instance, in recent years, numerous directory traversal, privilege escalation, and cross-site scripting vulnerabilities have been disclosed, as seen in the image below. In the future, attackers may discover ways of bypassing authentication entirely.
So, a torrent client gets hacked... what's the worst an attacker can do? Pirate some copyrighted materials? Well, yes, but it gets worse. Torrent clients are capable of creating files and directories on the system as well as replacing existing ones. That access to the filesystem can be abused by downloading malicious files through the compromised torrent client.
Linux systems are equally vulnerable to such attacks but are out of the scope of our demonstration here. The .bashrc file found in most Linux system is essentially a Bash script that's executed every time a new terminal is opened or SSH login is established. An attacker can use the compromised torrent client to download a malicious .bashrc file, replacing the original one found on the server. It would cause the server to execute the attacker's .bashrc when someone successfully authenticates to the server.
Open Firefox and Burp Suite. Configure Firefox to proxy requests through Burp and capture the login request. Replace the encoded "Authentication: Basic" string with "FILE0," right-click it, and choose the "Copy to file" option. The FILE0 string will act as a placeholder for Patator's wordlist. Save the request to the /tmp directory with the "utorrent_request.txt" filename.
To brute-force uTorrent web logins, use the below patator command with the utorrent_request.txt file created in step two. Make sure you substitute any paths below to the right directory, as yours may be different.
After gaining access to the torrent client, if there are no active downloads, simply add any torrent file and click the "General" tab to identify the username on the Windows system. The torrent can be deleted after discovering the username.
In Kali, download the qbittorrent client in a new terminal window. Most torrent applications allow for torrent creation, but the transmission-gtk client failed to create the .torrent file in my tests, so it's not recommended.
The torrent file will be created. Click "OK" and qBittorrent will begin seeding the file. The qBittorrent client must remain open the entire time for other torrent clients (i.e., the compromised uTorrent server) to download the file.
As an avid torrent application user, remote access to the client makes downloading new content very convenient. But such web apps must be well fortified with security solutions like Nginx, SSH port-forwarding, or Tor onion services to prevent unfettered brute-force attacks and full-access to the client from the internet.
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