Finding files that are too new (less than a year old) and removing them.

remove_new_files

# (find) in this directory (.) items of (-type) file (f)  whose last modification (-mtime) was less than 365 days ago (-365)
# pipe the result into a file called newfiles.txt
find . -type f -mtime -365 > newfiles.txt

#look at newfiles.txt
cat newfiles.txt

#if everything listed is a malicious file
#run the find again, but instead of outputing to file
#run as a subprocess (-exec) the remove command (rm) on each result ({}) 
#terminate the exec called subrocess (\; , where the \ escapes the required ;)
find . -type f -mtime -365 -exec rm {} \;