DDexec - a technique to run binaries filelessly and stealthily on Linux using dd to replace the shell with another process

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Context 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 of theirs at all (e. g. not allowing unprivileged users to place executable files anywhere). But this technique is here to change all of this. If you can not start the process you want... then you hijack one already existing. Usage Pipe into the ddexec.sh script the base64 of the binary you want to run (without newlines). The arguments for the script are the arguments for the program (starting with argv[0]). Here, try this: base64 -w0....

May 2, 2022
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Charles Charles
6 months ago

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Lizzy Agnes
8 months ago

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