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These Files Don't Show Their Extension 

John Hammond
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7 май 2024

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Комментарии : 102   
@martink.7497
@martink.7497 22 дня назад
Fun fact with the compression algorithms. [32:21] Depending on the type and input, some can result indeed bigger instead of smaller. Imagine a simple example with text content "AAAAAA" where you compress it and the result is "6A". As you can see, it is smaller, right - but what if the content will be "ABC"? The result will be "1A1B1C" resulting twice as big, instead of smaller. That is also the reason why there are multiple compression algorithms and where one can shine, the other fails and otherwise.
@teamredstudio7012
@teamredstudio7012 22 дня назад
I believe one of the reasons it's larger often for very small files is the metadata. I experienced this phenomenon while writing my own compression algorithm one day. The metadata might not go smaller than a certain size and this size depends on the file metadata structure. For example, a plaintext file might only contain 5 UTF-8 characters and be 5 bytes, but when archived, the archive contains the modification date, creation date, file path and the compressed data so it will always be larger than the input 5 bytes. It also depends on the entropy of the input file, the compression algorithm doesn't make all files smaller, only low entropy files are shrunk, high entropy files are actually compressed larger than their input because there is only a finite amount of possible byte combinations.
@U20E0
@U20E0 22 дня назад
Any lossless compression algorithm must on average of all possible inputs compress by a factor less than or equal to 1 ( so, either not at all or increase the size ) Otherwise you'd be storing more than 1 bit of information in each bit of the file
@olnnn
@olnnn 22 дня назад
@@teamredstudio7012 Compression algorithms will usually fall back to leaving a block of data uncompressed if it ends up being larger when compressed but it will still result in some small overhead in the datastream or file format compared to the original file since it has to actually store some metadata about compression method and size etc
@teamredstudio7012
@teamredstudio7012 22 дня назад
@@olnnn That is correct, I even implemented that in my own algorithm, where if the compressed chunk including the header for this chunk is larger than the uncompressed data the original data is just copied.
@BillAnt
@BillAnt 21 день назад
Oh man I was hoping for the NTAuthority\System will be able to edit/delete, but now I can't wait for the TrustedInstaller video. John Hammond to the rescue, that should be juicy. :D
@peekachugaming3231
@peekachugaming3231 22 дня назад
You can create .url files simply by creating a normal .lnk file over the GUI and simply paste in a URL. It will create a Internet-Shortcut (.url)-File - Steam does use those for theyre game shortcuts for example. Also you can refresh any explorer.exe content or your desktop with F5.
@whtiequillBj
@whtiequillBj 22 дня назад
@28:37, actually game shortcuts made by Steam are .url files not .lnk.
@teamredstudio7012
@teamredstudio7012 22 дня назад
Knowing where they are stored now, I might just make a little powershell script that scans the registry for all files with hidden extensions to make sure there aren't any extra.
@BillAnt
@BillAnt 21 день назад
Also delete the NeverShowExt keys from all instances. ;)
@Bizzybugproductions
@Bizzybugproductions 20 дней назад
​@@BillAnt can you help me understand this statement?
@BillAnt
@BillAnt 20 дней назад
@@Bizzybugproductions - Watch the full video to understand it.
@teamredstudio7012
@teamredstudio7012 14 дней назад
btw, if you want the script, I posted it in a second comment.
@DanGood122
@DanGood122 22 дня назад
FYI, you can right click the desktop to refresh it and the changes will take effect.
@peekachugaming3231
@peekachugaming3231 22 дня назад
Actually can press F5 to refresh on the desktop/explorer.
@BillAnt
@BillAnt 21 день назад
A simple desktop refresh via F5 or right click will not show the extensions via the removal of the NeverShowExt key. He ran a script which contains "taskkill /F /IM explorer.exe" and "start explorer.exe".
@pinkerdroit
@pinkerdroit 22 дня назад
Cheers! Thank you for covering this. 😃👍💛
@Eskimostyle
@Eskimostyle 22 дня назад
What main operating system do you use @John? Is it like bare metal ubuntu and all the security stuff you do is on VM's or some other kind of setup? Thank you in advance!
@Datalata
@Datalata 22 дня назад
Super interesting as always!
@raymondcarlson7836
@raymondcarlson7836 19 дней назад
The Moles (Minecraft hacker guys) used the .pif trick in a campaign against Minehut. They used .pif to trick users into running a stealer under the guise of it being a captcha image.
@ThatGuySnagz
@ThatGuySnagz 22 дня назад
Hey John, what keyboard do you use?
@msh6610
@msh6610 22 дня назад
Allmost fell for a lnk file inside an archive that looked like a folder few years ago.. It wanted todo some powershell stuff from an url... Pretty sniky :s
@VaibhavShewale
@VaibhavShewale 22 дня назад
ooh man this are some awesome extension
@numankarahan5447
@numankarahan5447 20 дней назад
Do you suggest upgrading from windows 10 to 11?
@Lampe2020
@Lampe2020 21 день назад
Isn't there a NirSoft tool that allows you to run any executable or command as any user with basically any settings you can imagine?
@svinxt
@svinxt 18 дней назад
Where do you get your Virtual Machines from?
@logiciananimal
@logiciananimal 22 дня назад
Calculator has a protocol handler? Wild. I had looked at protocol handlers briefly based on one of JH (or maybe it was LiveOverflow)'s stuff and seemingly missed that one! (I remember writing code to enumerate all the registered ones.)
@jmr
@jmr 22 дня назад
I vaguely remember something about setting the hot key but I don't believe it was saved in the file.
@Xeno881
@Xeno881 18 дней назад
I want learn Format String Vulnerability in pwn to get shell,can you teach me?
@Y0GAAAA
@Y0GAAAA 20 дней назад
Very nice video, we want the following 👽
@elderdragon7856
@elderdragon7856 22 дня назад
4:53 not working when I do this. It is still showing the ending
@Neuer_Alias_erstellen
@Neuer_Alias_erstellen 22 дня назад
cool shirt
@270jonp
@270jonp 22 дня назад
quality video.
@CityNaturePig
@CityNaturePig 20 дней назад
15:20 Your Desktop, Documents and some other folders on the side are already such libraries in Win11. Maybe you cannot add a library to a library. Or Win11 is just being weird.
@kipchickensout
@kipchickensout 19 дней назад
We have software which works with MAPI or SMTP depending on the config so I guess it's actually used
@luketurner314
@luketurner314 21 день назад
For anyone wondering how John is 'typing' emoji in Windows: windows/super-key + . (period/full stop)
@zegs32
@zegs32 22 дня назад
Man you teach me a lot!
@KyleRice
@KyleRice 22 дня назад
How did John Get the Checkmarks
@sunla
@sunla 22 дня назад
The emojis? You can pull that up on Windows with a key
@DanGood122
@DanGood122 22 дня назад
Ctrl + : for emoji menu within Windows
@KyleRice
@KyleRice 22 дня назад
Thanks for the info
@Ruhgtfo
@Ruhgtfo 22 дня назад
Memories bring back memories bring back YO😂
@MrKrezol
@MrKrezol 22 дня назад
.url icon worked in Internet explorer
@666KoXz666
@666KoXz666 22 дня назад
total commander shows every extention
@omahanprabla3058
@omahanprabla3058 20 дней назад
Hope you're not using the cracked version bro
@codyaimes4354
@codyaimes4354 20 дней назад
Lol. I spent a few hours last weekend doing something similar.
@granitium
@granitium 21 день назад
I think search-ms failed because you typed 'johnh' instead of 'john'
@dj_chateau
@dj_chateau 22 дня назад
Completely vanilla; opens Sublime. 😂
@jabelltulsa
@jabelltulsa 22 дня назад
Dude ... pif files .... I know them. I'm so old.
@edwardkostreski6733
@edwardkostreski6733 22 дня назад
That .mapi sounds like a pandoras box 😂
@LeoMakesStupidThings
@LeoMakesStupidThings 17 дней назад
That's why I use Linux
@RonnieRedd
@RonnieRedd 22 дня назад
Don't use windows
@new_simsons
@new_simsons 22 дня назад
Cry about it
@BigFunnyGiant
@BigFunnyGiant 22 дня назад
Some people really don’t have a choice. They have to for certain software or for work.
@JohnSmith-jc7dk
@JohnSmith-jc7dk 20 дней назад
Linux GUI is very buggy
@paulbond8244
@paulbond8244 22 дня назад
🔥🔥🔥
@BigFunnyGiant
@BigFunnyGiant 22 дня назад
Windows still can have PIF files? What?
@gaatjenietsaan88
@gaatjenietsaan88 22 дня назад
I got hacked by a sketch software pls help me
@gaatjenietsaan88
@gaatjenietsaan88 22 дня назад
It says i need to pay 1500 in bitcoin
@Ormaaj
@Ormaaj 15 дней назад
Is there really no way to show the .lnk? A problem is that they look exactly like symlinks except that the "link target" field is empty, which you can't always see, so that's kind of annoying.
@sophisticatedserpent1512
@sophisticatedserpent1512 19 дней назад
chat jibbity 🤣
@Knoweverything308
@Knoweverything308 22 дня назад
First comment from Kenya always inspired.
@munchcup
@munchcup 22 дня назад
Usituhack banah
@ThisIsJustADrillBit
@ThisIsJustADrillBit 22 дня назад
FIRST ❤ Also you're the man 🔥 🤘
@user-el5uu9vb9o
@user-el5uu9vb9o 22 дня назад
This is why you use Linux.
@ilovebobrov88
@ilovebobrov88 22 дня назад
GNU/Linux🤓🤓 😤😤☝☝🤬🤬🤬👹👹
@muizzsiddique
@muizzsiddique 22 дня назад
Ah yes, the Operting System that stores plain text files, binary executables, and literally anything else, all in a file with no file extension.
@CartoonSlug
@CartoonSlug 22 дня назад
​@@muizzsiddique Oh ok ill just use windows
@benebene9525
@benebene9525 22 дня назад
​@@muizzsiddiqueYou do realize that nobody is stopping you from using extensions anyway? The point is that linux doesnt lie to the user about filenames
@wild_elliot
@wild_elliot 22 дня назад
​​Everything has it's own pros and cons​@@muizzsiddique
@haxxor7606
@haxxor7606 22 дня назад
This guy does not do segways. Like this segway to our sponsor...
@U20E0
@U20E0 22 дня назад
Segue
@DaVinceE27
@DaVinceE27 20 дней назад
Nope, but this guy segways... Like he is on a roll.
@user-bs8mj4hu2u
@user-bs8mj4hu2u 22 дня назад
one of pest in my life
@geekygymrat
@geekygymrat 22 дня назад
No views?! Never been so early on a video.
@adrian16ftw31
@adrian16ftw31 22 дня назад
oh okey new thing for me to use ...
@soft_compound
@soft_compound 22 дня назад
mate how am i so early
@nlegendgaming8324
@nlegendgaming8324 22 дня назад
First
@AltaBross
@AltaBross 22 дня назад
Big fan sir i watched you every video they are awesome how can i contact you online or chat with you i have some cybersecurtiy or security related question from which platform i can ask you that questions?
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