Virus.DOS.OneHalf

So here's how the encryption breaks down:

The virus gains control at bootup and creates a random encryption key, which it stores in the master boot record (MBR). It then enumerates the size of the hard drive and selects the last two unencrypted cylinders on the disk, and encrypts them using the aforementioned key. It continues encrypting the last two unencrypted cylinders until it finally reaches the middle of the disk, when it outputs "Dis is one half." to the screen.

Now, the virus basically owns your hard drive. When data that resides in the encrypted cylinders is accessed, OneHalf takes control and decrypts it and then displays it to the user. However, if the virus is removed improperly (as shown in the video), the encryption key is lost and all data is permanently damaged beyond repair and must be recovered from backups.

[tauheximus]

_PACKARD BELL =_
America grew up listening to our computers boot. It still does.

[SmeddyTooBestChannel]

There's something I love about this virus. It's like a race against time. Can you save your PC before it succumbs to complete destruction!?

*dis is one half....*

[rdbirdify]

I love the sound of the Packard Bell while booting!

[Konym]

Old Viruses: *Let's be creative!*

New Viruses: *GIVE US YOUR MONEY OR DIE!*

[Bleenderhead]

I love the parasitic nature of this one. It is the illness but also holds the only cure (the private key), so the host will leave it be even if it's vulnerable and conspicuous. You're totally right, nowadays these complex, delicate symbiotic relationships have died out with the primordial viruses and crappy adware has become the dominant species.

[GamingPalOllieMK]

I really like it when you use cameras to record screens from old computers man, it gives your videos about old strange viruses a really cool atmosphere, makes the viruses seem more sinister and old school somehow.
Of course I enjoy your Virtual Machine videos too, but I find these type of recorded screen videos much more...atmospheric if that makes sense

[StanleyOpar]

Newer Malware Sucks. It's all about money and stealing your information instead of trolling the user.

[ProjectADAMAndroid]

the boot "GRRT GRRRT CH GRRT -click-"

[zLamp]

This is one of my favourites. I would totally keep that virus on my PC, it's like a pet virus, I would've been the most popular kid of my school back in the days.

[SB-hsyn]

I find it very interesting going back to the past and seeing how old malware/viruses worked, unlike now were they are no fun anymore they are just pure "Hey let's go fuck your shit up and then leave without any trace" At lest old viruses had the common manners to make themselves known and have a little fun with the user.

[Eriphiel]

I really liked this video. Sure, it wasn't as visually stimulating as some DOS viruses, but it was still interesting and destructive. You did a great job explaining the encryption payload and showing what would happen if OneHalf is removed incorrectly. Thanks for the video!

[gingersgirl]

I LOVE watching your videos. You are the only person on Youtube that I trust when it comes to showing us a computer virus. Plus, this is why my dad and I will strictly use Linux if possibke. Unfortunately he has to use Windows 7 for his job though, but once he gets a new job he will be back to Linux man!!!! There are about 30 Linux viruses though, so, I guess you never know! Still a HUGE fan!!!

[LDPhinX]

I remember you first showing off this DOS virus, it has always actually intrigued me in a way as too how the encryption goes down. Glad to see you put it in the description.

[DaniPaunov]

Encrypting Viruses?
Hmmmm... I got this...
Call of Viruses: Encrypting Ransomware

Objective of the game: Go through the levels as fast as you can and defeat the boss(es) at the final level. Every 10-30 Minutes (Depending on difficulty of the level that is being encrypted) 1 level will be encrypted (In order). If a level is encrypted while you are in it, you'll have 10 more minutes to complete it, otherwise you'll die, and also if it get's encrypted, you'll be really confused of what's what, and you'll barely even know of what's the ground and what isn't the ground. When you have 2.5 minutes left (before level is encrypted and before you die), the timer will start flashing and give you a warning. You can no longer play on encrypted levels and to decrypt them, you'll have to beat the final boss(es). If you fail on a level, you'll respawn, but if it gets encrypted and you die, you'll have the option to continue (decrypt the level and try again with added 5 minutes, 10 minutes..; which depends on how many times you fail (you'll get 10 continues at the start of the game)) or restart the game. You can only save when you quit the game and also your save gets deleted at the start of a level so you can't cheat and come back...
I need more ideas...

[MasterYoshidino]

Dis is one half. Sounds cool when you say it.

[cloroxtmbleach]

You know a danooct1 video is gonna be lit when it lasts 10+ minutes🔥🔥🔥💯🔥

[steiner]

Great one, I find your videos absolutely mesmerizing. It might be your mastery of all the operating systems, or basically the sentiment for old MS-DOS and Windows 95, but I enjoy every vid of yours. Keep it up!

[andresbravo]

At least this one is OneHalf, your most favorite DOS Virus that might happen.

[softestcat]

5:29.5 is the best part.

It says "Dis is one half, " when the first half of the video ends.

[marioisawesome]

Imagine the first thing the virus encrypted was itself.

Then you deleted it.

Would that fix the problem?