text steganography
Download attachments
Open is a document
Nothing special suspected hidden text
Click File - Options - View - Hidden Text
find special symbols
This looks like converting the two symbols to 0 1
Convert binary to string
So replace with
get
Provide an online website
Provide online website 
http://xiaoniutxt.com/binaryToString.html
offse:0x3490
Don't think it's a flag it's not
This should be a number of lines of code
So drag it into 010
NNSXSORRGTSL3DPHTKCOPOVP42K3BZNNS4======
Base32
Key: 14 digits
Key Why does something have a key
Later, I thought that the 3490h had not been used.
.From line 33940, copy code, new paste
Change the header in the new file to the document format
Save as doc format
Open
Drag with the mouse to obviously find something
Open in order and find that a password is required
Because I said before that the key is a 14-bit pure number
Get the password (too long and not displayed)
Of course there is an easier way
bypass directly
The document is also saved in html format
Open directly in browser
Right-click to view the webpage source code to find the hidden part
RmxhZyU3QnNob3dfY3RmX3Rzd19jYyU3RA==
directly on base64
Flag{show_ctf_tsw_cc} ( •̀ ω •́ )y