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I have found that base64 encoded webshells and the like contain lots of data but hardly any newlines due to the formatting of their payloads. Checking the "width" will not catch everything, but then again, this is a fuzzy problem that relies on broad generalizations and heuristics that are never going to be perfect.
What I have done is set an arbitrary threshold (200 for example) and compare the values that are produced by this script, only displaying those above the threshold. One webshell I tested this on scored 5000+ so I know it works for at least one piece of malware.
passthru, shell_exec, system, phpinfo, base64_decode, chmod, mkdir, fopen, fclose, readfile
Since some of the strings may occur in normal text or legitimately you will need to adjust the command or the entire regex to suit your needs.
Fast and easy way to find all established tcp connections without using the netstat command.
calculate how many different lines between two files
Open Port Check
Get the longest match of file extension (Ex. For 'foo.tar.gz', you get '.tar.gz' instead of '.gz')
`pwd` returns the current path
`grep -o` prints each slash on new line
perl generates the paths sequence: './.', './../.', ...
`readlink` canonicalizes paths (it makes the things more transparent)
`xargs -tn1` applies chmod for each of them. Each command applied is getting printed to STDERR.
On wired connections set 'eth0' instead of 'wlan0'
Runs a diff on two files ignore comments and blank lines (diff -I=RE does not work as expected). Adapted from a post found on stackexchange.
Lists everithing using -l "long listing format" wich includes the space used by the folder. Displays it in -h "human readable form" (i.e. 2.2G, 32K), and -R recurses subfolders.
grep -e using a regex, show lines containing the word "total" or a ":" at the end of the line (those with the name of the folder) only.
Substitute for #11720
Can probably be even shorter and easier.
Requirements: curl, grep, awk, internet connection with access to wikipedia
If you can make shorter version of this listgetter, you are welcome to paste it here :)
Will search for the given pattern and build a list of occurrences.
Then you can use :copen and :cclose to toggle the list.
When browsing the list, ENTER will take you to that line in the file.
Old Sys5 system and SUN computers don't have the -H option. Adding /dev/null forces grep to use the multi-file output and report the file name.