Super Secret

Something's blocking my flag from this file...

Recon

$ unzip -l document.odt
Archive:  document.odt
  Length      Date    Time    Name
---------  ---------- -----   ----
       39  2019-11-17 08:14   mimetype
      899  2019-11-17 08:14   manifest.rdf
        0  2019-11-17 08:14   Configurations2/progressbar/
        0  2019-11-17 08:14   Configurations2/toolbar/
        0  2019-11-17 08:14   Configurations2/statusbar/
        0  2019-11-17 08:14   Configurations2/toolpanel/
        0  2019-11-17 08:14   Configurations2/popupmenu/
        0  2019-11-17 08:14   Configurations2/images/Bitmaps/
        0  2019-11-17 08:14   Configurations2/accelerator/
        0  2019-11-17 08:14   Configurations2/floater/
        0  2019-11-17 08:14   Configurations2/menubar/
     6700  2019-11-17 08:14   content.xml
    11472  2019-11-17 08:14   styles.xml
      979  2019-11-17 08:14   meta.xml
      380  2019-11-17 08:14   Basic/Standard/flag.xml
      345  2019-11-17 08:14   Basic/Standard/script-lb.xml
      338  2019-11-17 08:14   Basic/script-lc.xml
    11657  2019-11-17 08:14   settings.xml
     3983  2019-11-17 08:14   Thumbnails/thumbnail.png
     1362  2019-11-17 08:14   META-INF/manifest.xml
---------                     -------

Flag

$ grep -i tuctf Basic/Standard/flag.xml

TUCTF{ST0P_TRUST1NG_M4CR0S_FR0M_4N_UNKN0WN_S0URC3}