2022-06-03 11-32-03~2.png ⭐ Original

: Use binwalk -e 2022-06-03 11-32-03~2.png to see if another file (like a .zip or .txt ) is embedded inside the image data. 5. Final Flag Extraction

: If you change the dimensions manually, the CRC (Cyclic Redundancy Check) at the end of the chunk will be invalid. You can use a tool like PCRT (PNG Check & Repair Tool) to automatically calculate the correct dimensions based on the existing CRC. 4. Steganography Check 2022-06-03 11-32-03~2.png

: Use the file command in Linux to confirm it is indeed a PNG image. : Use binwalk -e 2022-06-03 11-32-03~2

: Locate the IHDR section (usually starts at offset 0x0C ). The four bytes following IHDR are the width, and the four after that are the height. You can use a tool like PCRT (PNG

: Open the image in a viewer. If the image appears truncated or shows "noise" at the bottom, it suggests a resolution or chunk error. 3. PNG Chunk Repair (The "Core" Step)

If repairing the header doesn't reveal the flag, the next step is checking for hidden data:

: Run exiftool 2022-06-03 11-32-03~2.png . This often reveals interesting timestamps or software tags, though in this specific case, the metadata is usually clean or points toward a Windows screenshot. 2. Visual Inspection and Strings