There are some torrrents showing up with .lnkextension (ex: movie.mp3.lnk, tvshow.mkv.lnk…) and automated software (Sonarr, Radarr, Lidarr, qBittorrent RSS Downloader) could pick those torrents (but not import).
These (fake) torrents include a .lnk file that executes a script on your Windows
HOW TO exclude from download on qBittorrent.
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Go to Options -> Downloads
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Enable “Exclude file names”
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Add patterns:
(one by line)
*.mp4.lnk
*.mp3.lnk
*.mkv.lnk
*.torrent.lnk
Or exclude all together: *.lnk
Example on VirusTotal https://www.virustotal.com/gui/file/e74f64df6ebaf3a1b6e3f42591eb6e87d2ac2828eb5a99fd8d3d82c140137fc9/detection
Probably this will help as well at the arr end: https://forums.sonarr.tv/t/automatic-blacklist-malware/37822
thanks Microsoft for hiding extensions by default!
Yes, but also whoever set the defaults for the *arr tools. Why would any filename with extra shit past the extensions you’re looking for be considered an acceptable result?
Tack $ on the end of your regex, for fucks sake.
Is not regex
https://github.com/qbittorrent/qBittorrent/pull/17106Examples
*.exe: filter ‘.exe’ file extension.
readme.txt: filter exact file name.
?.txt: filter ‘a.txt’, ‘b.txt’ but not ‘aa.txt’.
readme[0-9].txt: filter ‘readme1.txt’, ‘readme2.txt’ but not ‘readme10.txt’
Microsoft: De nada, amigo! Oh… here’s an ad, btw… and…did you enable Recall already?
or rather: oh silly you were so clumsy that you disabled recall by accident again. let us be so kind to re-enable it for you
For those interested, John Hammond did a video a few months ago about
.lnkextension (and other 16 hidden extensions on Windows).He doesn’t go to much or to deep into the subject, but you get a general view how this could be exploitable.
that executes a script on your Windows.
I don’t have a Windows.
Then just draw on your wall.
Nice one OP. Just had sonar pick up one of these today named like a proper release of a trusted group. Sonarr didn’t move it from qbit but better to not DL it in the first place even though its a linux box
Nice to know! Thank you!
Not using Windows helps a ton :)
Sonarr will still pick the release and download GBs of malware, and if you don’t notice your download directly is filled with GBs of fake torrents
How is the link file executing malware? Can you put any shell script as the target?
You can put the script itself as the link. Shortcut to: powershell -command “Write-Host ‘Gonna pwn your shit’”
I am pretty sure a link file can open cmd/powershell with parameters to execute commands
yep! I’ve found out browsing hacking/spamming site and i’ve found something too good to be true, it downloaded archive nested inside other archive and in it was silngle .lnk file leading to “the resource”. Peeking inside i’ve found powershell executing base64 (or base32?) encoded script (it’s got commandline option for that. if you want to ask wtf ask microsoft, and tell me), it dl’d some exe from some site and ran it, site was down alredy.
I use Arch btw
Me too, but don’t want to download GBs of malware and bandwidth
.lnk files are less than 4kb
Not these ones, some could have more than 1GB, look at the virustotal link, the file had 422MB.
Also Sonarr/Radarr filter torrents by size
Here some examples
https://bt4gprx.com/search?q=The.Lord.of.The.Rings.The.Rings.of.Power.S02E08Those where posted on 1337x (and removed) and probably other sites, Sonarr can pick those based on release name and torrent size
PS: had to rename the fine from
.lnkto.comso virustotal could acceptThat would seem suspicious. I’m sure they have some way to pad out the size.
Anyone paying attention to size would probably also notice they’re just .lnk files.
Not necessarily. Even with “hide extensions” unchecked, Windows hides the .lnk extension by default; it just shows an arrow in the bottom-right corner of the icon, which is plausibly missed when in the list view. I’m surprised antivirus doesn’t know about it already tbh.
