ISSessions CTF 2021 Excel Proficiency

· 1 min read
ctf writeup steganography

Finding a hidden flag in an Excel spreadsheet using ASCII art on a concealed sheet.

Excel 1

This file looks fishy, what’s wrong with it…

Solution

Notice that the second sheet has a really large scroll bar?

Zoom out on the second sheet.

ASCII Art! The flag was hidden in the cell coloring, visible only when zoomed out far enough to see the full picture.

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