Zip Bomb is a type of compressed file with a huge ratio. With a 42 Kb compressed file, you can decompress up to 5.5Gb. By using the “non-recursive” algorithm, the author can compress at a rate that exceeds the limit of the specified Zip file. This article will share you Download 3 Zip Bomb files available on the Internet.

Zip Bombs are harmful to the system because they create an ‘environment’ that makes it easier for traditional Viruses to attack.. Fortunately, anti-virus programs are now able to detect if a file is a Zip Bomb. or not and warn the user to unzip it.

What is Zip Bomb?

One fruit Zip Bomb aka zip of death or decompression bomb is a type of malicious archive designed to corrupt or cripple the system reading it. It is often used to disable anti-virus software or create an opening for other viruses to enter the computer.

Instead of hijacking the program, as normal computer viruses often do, the zip bomb actually allows the system to do its job as designed. The only catch is that the zip bomb contains so much compressed data that decompressing it requires a huge amount of memory, disk space and time.

Modern anti-virus software can detect if a file is a bomb zip, to avoid decompressing it.

Zip Bomb achieve high compression ratio by stacking the contents inside the zip file. “Non-recursive” means that it does not rely on recursive decompression archives nested within zip files: it expands completely after one round of decompression. The output size increased quadratic in the input size, reaching a compression ratio of more than 28 million (10MB → 281 TB) at the limits of the zip format. Even greater scaling is possible using 64-bit extensions. Structure using only compression algorithm DEFLATE and compatible with most zip parsers.

Details and how to use

One fruit Zip Bomb usually a small file for ease of submission and avoidance of suspicion. However, when unzipped, the content is so much that the computer may hang.

An example about bomb zip is 42.zip. This is a zip file containing 42 kilobytes of compressed data. The file contains 5 layers of zip files nested in sets of 16. Each bottom layer archive contains 4.3 gigabytes (4 294 967 295 bytes; ~ 3.99 GiB ) for a total of 4.5 petabytes (4 503 599 bytes) 626 321 920 bytes; ~3.99 PiB ) of uncompressed data.

This file can be easily downloaded from the Internet. In anti-virus software, only a few layers of recursion are implemented on the repository to help prevent attacks that can cause buffer overflows, out-of-memory conditions, or program execution time delays. acceptable process. Zip bombs often rely on repetition of identical files to achieve extremely high compression ratios.

Say, you’ve got a data that looks like: anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet, anonyviet

During compression, it will be simply written as anonyviet * 16. This type of ‘shortening’ will obviously save a lot of space, and therefore the size of the compressed file will be very small. But when decompressing, the size of the file will be unimaginably high, so high that you can run out of storage space on your system and still not be able to fully decompress!

Download Zip Bomb

If you are a person who likes to explore and is curious, try Download Zip Bomb and test it. Try it on a virtual machine VMWare or Sandbox to keep your computer safe.

File name	Compression capacity	Decompression capacity
zbsm.zip	42 kB	5.5 GB
zblg.zip	ten MB	281 TB
zbxl.zip	forty six MB	4.5 PB (Zip64)

Source code: git clone https://www.bamsoftware.com/git/zipbomb.git

Data and Origin: git clone https://www.bamsoftware.com/git/zipbomb-apers.git

Zip Bomb nice Zip of Death is a compressed file with extremely high proportions. When you unzip the 42kb Zip Bomb can get a folder up to 5.5GB. To create a Zip Bomb there are many ways, usually programmers will use a recursive algorithm to create a program that reproduces endlessly. You can use a simple text file containing only NULL characters and compress it with WinRar to create a simple Bomb Zip file.

Zip Bomb Although it won’t damage your data, it will cause system crashes due to using too much CPU to decompress. Therefore Zip Bomb is listed as harmful files.

What is the NULL character?

A NULL character is like any other character you type with your computer keyboard. It looks like a null character. It’s a special character, not available on the keyboard. But you can enter a null character using a combination of keys – you can press Alt + 255 on the keyboard to enter a NULL character. Open Notepad and press and hold the Alt key and type 255 with the number keys and then release the Alt key. This will create a space on your notepad.

How to create Zip Bomb with Notepad

This tutorial is one of the simple methods to create a Zip Bomb. This can crash your own system if you open it by mistake. You will need to install WinRar or any other compression software to create the zip file. So, be cautious and follow these steps:

Step 1: Open Notepad first.

Press Windows + CHEAP to launch the RUN utility. then enter notepad go there and press Enter.

Notepad interface

Step 2: Create the character NULL

In notepad, type the character NULL. Press and hold the Alt key and press 255 (right numeric keypad) and release the Alt key. This will print a NULL character. Alternatively, you can use the Space key.

Enter a few more NULL or SPACE characters using the Keyboard. For quick operation, press Ctrl + A -> Ctrl + -> Ctrl + DRAW to copy paste all characters. This will create a larger notepad file

Now save this notepad file with the name anonyviet.txt and put in folder Zip Bomb outside Desktop.

Step 3: Create a large text file

Go to the Zip Bomb folder on the Desktop, copy the file anonyviet.txt Output as many as possible about 100 files.

Now you will copy all the contents of the copied files into the same file. It means to put the contents of all files into a single file. You open CMD and type the command below to access the Zip Bomb folder on the Desktop:

cd "Desktop\Zip Bomb"

Continue typing the command below, to copy the entire contents of the txt files and create a new file named bomb.txt

copy /b *.txt bomb.txt

Note:

Copy	Used to copy files or folders
/b	Used to copy binary content
* .txt	Copy all text files of current directory
bomb.txt	Copy all content to file bomb.txt

Now, you continue to copy the bomb.txt file to multiple copies. And continue to use the command to copy the contents of the copy bomb into a new file named bomC. You can perform this operation repeatedly to create a large txt file.

copy /b *.txt bomC.txt

NOTE: YOU MUST NOT OPEN THE BOMC.TXT FILE BECAUSE IT CAN BE HANGED BECAUSE NOTEPAD HAS TOO MUCH CHARACTERS

Repeat this operation many times and you will create a very large text file. AnonyViet has created a bombC.txt file of nearly 2Gb. You can make the capacity more than half by repeating the steps of copying the content over and over.

Step 4: Create Zip Bomb

Now you compress the BomC.txt file with the software Winrar. Right click on BomC.txt and select Add to Archive…

You should choose the Zip compression type to suit operating systems such as Linux, Windows, etc.

Increase the compression ratio by selecting Compression method: Best

The result will be a 2Gb compressed file compressed to 2Mb. If you compress standard winrar, it’s only about 100kb.

To increase the risk, you should create extremely large text files, when decompressing the program will occupy CPU and RAM, causing system Lag.

This is one of the ways to create a simple Zip Bomb. You can use Python to create a loop that reproduces Bomb Zip.