Parade_buster-final.7z

The offset for the hidden PNG data could be calculated by comparing the reported "Packed Size" from the 7z -slt l command with the actual file structure.

: Standard extraction and concatenation of the junk files failed to yield a valid binary. Parade_Buster-Final.7z

The file Parade_Buster-Final.7z was the concluding challenge in the series from TastelessCTF 2020 . This write-up details the process of identifying a hidden PNG file embedded across hundreds of separate archives. Challenge Overview The offset for the hidden PNG data could

The first file contained the start of the PNG, while the last file ( part2_375.7z ) contained the . This write-up details the process of identifying a

Concatenating these extracted bytes from all files produced a final, valid image file named , which contained the flag for the challenge. CTFtime.org / TastelessCTF 2020 / 7/12 / Writeup

: To solve this, a script was used to loop through all 376 files, extract a specific block of bytes (typically 0x11 bytes) from each, and concatenate them. Final Result