Infinite.zip 〈GENUINE ✓〉

Do not extract unknown or unexpectedly small zip files from untrusted sources. zip and recursive zip bombs ? 42.zip (2004) - Hacker News

Here is a deep report on its mechanics, purpose, and mitigation: 1. What is it?

The most infamous example, 42.zip , is a 42-kilobyte file that, when fully extracted, expands to 4.5 petabytes ( Infinite.zip

Its primary purpose is to exhaust disk space (filling up the server's hard drive) or cause high CPU utilization, resulting in system failure.

When an antivirus scanner or user unzips the file, the decompression engine attempts to expand every layer, leading to an exponential increase in disk space usage. 3. Purpose and Impact Do not extract unknown or unexpectedly small zip

Systems should be configured to reject archives where the ratio of compressed-to-uncompressed size is suspiciously high.

"Infinite.zip"—often referred to in technical circles as a type of or decompression bomb (such as the famous 42.zip )—is a maliciously crafted archive file designed to crash, freeze, or overwhelm the storage capacity of any system that attempts to unpack it. What is it

It is used to overwhelm security software that attempts to scan within archives, preventing it from detecting other, actual malicious files. 4. Mitigation and Defense