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"there is a shell script file and a directory. There is also something suspicious shell script file, let's open it.

The script means that The writable.sh executes all script files in the writable.d directory with Bash shell and removes it after 5 seconds. The script seems to be repeatedly executed.

Let's induce crontab to create an executable file with SetUID authority. This file will execute Bash shell.

We need a binary executable file because SetUID authority does not operate in a shell script"

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