exiftool frames/frame_00123.png | grep -i comment No comment fields. Run zsteg on a few frames (install from Ruby gems or use stegsolve for a quick visual test):
Extract the trailing bytes:
sox audio.wav slice.wav trim 8 2 Open slice.wav in Audacity ā āPlot Spectrumā ā note the regular on/off bursts. fc2-ppv-1864525
import re, sys, json, urllib.parse, requests html = open('page.html').read() m = re.search(r'var\s+videoUrl\s*=\s*"([^"]+)"', html) url = urllib.parse.unquote(m.group(1)) print(url) Result (example): exiftool frames/frame_00123
# Get the offset of the final `moov` atom (e.g. 124,567,890) tail -c +124567891 fc2_1864525.mp4 > trailing.bin hexdump -C trailing.bin | head The dump shows plain ASCII: 124,567,890) tail -c +124567891 fc2_1864525
from morse_talk import decode_morse # Convert the timing into dots/dashes manually or with a script. # The result: .... .-.. .-.. --- ... (example) Decoded text: ā again a hint that the flag is embedded elsewhere. 7. Final Flag Extraction The most reliable source turned out to be the trailing bytes after the MP4 container. 7.1 Isolate the trailing segment # Find the start of the trailing data (use `mp4dump` from Bento4) mp4dump fc2_1864525.mp4 | grep -n 'moov' # last occurrence gives offset # Assume last moov ends at byte 124,567,890
exiftool frames/frame_00123.png | grep -i comment No comment fields. Run zsteg on a few frames (install from Ruby gems or use stegsolve for a quick visual test):
Extract the trailing bytes:
sox audio.wav slice.wav trim 8 2 Open slice.wav in Audacity ā āPlot Spectrumā ā note the regular on/off bursts.
import re, sys, json, urllib.parse, requests html = open('page.html').read() m = re.search(r'var\s+videoUrl\s*=\s*"([^"]+)"', html) url = urllib.parse.unquote(m.group(1)) print(url) Result (example):
# Get the offset of the final `moov` atom (e.g. 124,567,890) tail -c +124567891 fc2_1864525.mp4 > trailing.bin hexdump -C trailing.bin | head The dump shows plain ASCII:
from morse_talk import decode_morse # Convert the timing into dots/dashes manually or with a script. # The result: .... .-.. .-.. --- ... (example) Decoded text: ā again a hint that the flag is embedded elsewhere. 7. Final Flag Extraction The most reliable source turned out to be the trailing bytes after the MP4 container. 7.1 Isolate the trailing segment # Find the start of the trailing data (use `mp4dump` from Bento4) mp4dump fc2_1864525.mp4 | grep -n 'moov' # last occurrence gives offset # Assume last moov ends at byte 124,567,890
