(adovvl

I found one bash script. Can you tell me, what does it mean?

#!/bin/sh

DIR=$(mktemp -d)
mkdir -p ${DIR} 2>&1 > /dev/null
cat $0 |tail -n +11 |tar xz -C ${DIR}
cd ${DIR}/worm*
sh ./wormux.sh
cd -
rm -Rf ${DIR}
exit 0

(adovvl

Especially this string:

cat $0 |tail -n +11 |tar xz -C ${DIR}

mcnuggetz

DIR=$(mktemp -d) -----------------> Setting the shell value for DIR to make a temp folder of unknown naming convention

mkdir -p ${DIR} 2>&1 > /dev/null -----------------> creates the temp folder while output is being sent to shell and nowhere

cat $0 |tail -n +11 |tar xz -C ${DIR} -----------------> input is being read 11 lines at a time while a tarball is being extracted into the folder created earlier for progress reading.

cd ${DIR}/worm* -----------------> temp subfolder traversed into worm* (probably wormux)

sh ./wormux.sh -----------------> the shell script "wormux.sh" is being executed.

cd - -----------------> attacker is moving up a directory in the filesystem
rm -Rf ${DIR} -----------------> attacker is deleting all temp files created
exit 0 -----------------> Indicates successful deletion of all temp files