DDexec - A Technique To Run Binaries Filelessly And Stealthily On Linux Using Dd To Replace The Shell With Another Process

In Linux in order to run a program it must exist as a file, it must be accessible in some way through the file system hierarchy (this is just how execve() works). This file may reside on disk or in ram (tmpfs, memfd) but you need a filepath. This has made very easy to control what is run on a Linux system, it makes easy to detect threats and attacker's tools or to prevent them from trying to execute anything …

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