You gotta love how aggressively they prevent users from seamlessly running executables from the internet, a VERY legitimate common use case, but a desktop shortcut from the internet? Run away!
this post was submitted on 28 Sep 2024
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When I read the title, I was thinking of something sophisticated such as hidden executable streams inside the MKV container (IIRC, it's possible to append binary data other than audio, video or subtitles specifically inside a MKV). The ".lnk" trick only works in Windows and, even there, it's easy to prevent: Windows Explorer > Options > Advanced > find and check "Always show extensions for files" (i can't really remember the exact label for this option as I'm not a Windows user, but something like this will be there).
I believe you uncheck "Hide extensions for known file types"
Exactly! Thanks! I couldn't point the exact label, I've been using Linux for years in a daily basis so I forgot most of the Windows shortcuts/options.
Even then, that setting doesn't unhide the ".lnk" file extension, that requires a registry edit: https://www.askvg.com/tip-how-to-show-file-extensions-of-shortcuts-lnk-url-pif-in-windows-explorer/
Although shortcuts are pretty easy to spot in the first place unless you just double-click things without paying attention lol
Also make sure you have file extensions enabled in Explorer, it makes it waaay harder for something like this to work.
Could you just add *.lnk?
That's mentioned near the bottom of the post.
How is the link file executing malware? Can you put any shell script as the target?
I am pretty sure a link file can open cmd/powershell with parameters to execute commands
You can put the script itself as the link. Shortcut to: powershell -command "Write-Host 'Gonna pwn your shit'"
Nice to know! Thank you!
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.
Linux users:
What if it executes and install Windows 11 on your machine!?
That would be the very worst malware. I mean both the malware that installed it and win11...
Oh lord please have mercy! Blacklisting the file extension right now!
ackshually the proprietary .lnk shortcut format can only be run on windows 🤓
Me too, but don't want to download GBs of malware and bandwidth
Weak.
Harbor disaster. Seed the malware. Spread the fruits of chaos amongst the unworthy. Be complicit in their downfall. Feed on their agony ^^/s
.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.S02E08
Those 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 .lnk to .com so virustotal could accept
That 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.
Yet another reminder that piracy on Linux is the way because new files don’t have execute permissions by default
On many distros will open with WINE by default, not a big deal, you can just delete ~/.wine. If it does anything
Is that the malware that is undetectable because it runs purely in memory? The name is escaping me