Provided is a file with loads of numbers in it.
These are just decimals and after converting from decimals to raw, it reveals a PNG header so we try to render the image.
Flag: NC3{JULERENSDYR!}
Warning doing this challenge will extract more than 1 GB to your system.
This challenge is basically a "extract loop" challenge, with a tiny twist. At some point during extraction, a hint drops out, to target a specific zip file. This i just added whenever the code reaches a exception.
Following code will extract zip until theres no left.
#!/usr/bin/python3
from zipfile import ZipFile
def getArchiveName(zip_file):
with ZipFile(zip_file, "r") as f:
names = f.namelist()
return str(names[0])
def unzipArchives(zip_file):
with ZipFile(zip_file) as archive:
archive.extractall()
def extract(file):
zip_file = file
while True:
print("[+]Extracting {0}".format(zip_file))
unzipArchives(zip_file)
zip_file = getArchiveName(zip_file)
def main():
try:
extract("zip_mareridt.zip")
except:
try:
extract("49c86cecf65cf1b793c914661026e240.zip")
except:
print(open("flag.txt", "r", encoding="utf8").read())
if __name__ == "__main__":
main()Flag: NC3{godt_det_er_overstået}
Again provided file are just decimals after conversion we're left with alot of data.
The rebrand link is just an easter egg, rick can be found every year.
I went straight into using binwalk to examine the file:
after inspecting the image binwalk extracted.
It was a classic stegsolve opportunity:
Flag: NC3{JULEMANDENS_RENSDYR_PÅ_TUR}