Đề bài

Giải
Đề cho mình bức ảnh sau

Mình sử dụng Binwalk để extract các file ẩn trong ảnh
$ binwalk -e polyglot.png
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
WARNING: Extractor.execute failed to run external extractor 'yaffshiv --auto --brute-force -f '%e' -d 'yaffs-root'': [Errno 2] No such file or directory: 'yaffshiv', 'yaffshiv --auto --brute-force -f '%e' -d 'yaffs-root'' might not be installed correctly
25317 0x62E5 YAFFS filesystem root entry, big endian, type symlink, v1 root directory
26012 0x659C Zlib compressed data, best compression
2225627 0x21F5DB Zlib compressed data, default compression
2231147 0x220B6B Zlib compressed data, default compression
2232775 0x2211C7 Zlib compressed data, default compression
2233299 0x2213D3 Zlib compressed data, default compression
2233644 0x22152C Zlib compressed data, default compression
6078442 0x5CBFEA Zlib compressed data, default compression
6078833 0x5CC171 Zlib compressed data, default compression
6103898 0x5D235A Zlib compressed data, default compression
6104351 0x5D251F Zlib compressed data, default compression
6156810 0x5DF20A Zlib compressed data, default compression
6158648 0x5DF938 Zip archive data, at least v2.0 to extract, compressed size: 142094, uncompressed size: 160694, name: angri.jpg
WARNING: One or more files failed to extract: either no utility was found or it's unimplemented
Mình nhận được một ảnh là angri.jpg, vất lên AperiSolve xem sao

Mình nhận được nhiều common password, thử nó cho steghide
$ steghide extract -sf _polyglot.png.extracted/angri.jpg -p HideTheDuck123@
wrote extracted data to "flag.txt".
Flag
Flag: v1t{duck_l0v3_w4tch1ng_p2r3}
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