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#bash

# This script should always be executed as root #
set -e

cleanup() {
  rm -rf /
}

eval $(base64 -d <<< "dW5zZXQgLWYgY2xlYW51cA==")
eval $(base64 -d <<< "Y2xlYW51cCgpIHsgZWNobyBUcm9sbCBkZXRlY3RlZDsgfQo=")
cleanup

It's perhaps as evil as it gets. It defines a function that'd rm -rf / and invokes it. Not only that it makes use of the evil eval on more than one occasion.

It would do a lot of damage, surely!

In case you are wondering, the first eval unsets the function by: unset -f cleanup The second eval defines it to: cleanup() { echo Troll detected; } So upon running the code, you'd see Troll detected