Microsooft

As it's a docx file we can extract all the individual parts using binwalk.

binwalk -e microsooft.docx

Then we navigate to /root/Desktop/_microsooft.docx.extracted/src/, open up oof.txt and Ctrl + F for flag.

flag{oof_is_right_why_gfxdata_though}

Alternatively, if you don't want to use the command line, change the extension to .zip and unzip

Navigate into the correct folder and open oof.txt. ctrl + F to search for the flag.