Tags: forensics
Rating:
# Journey to the centre of the file 2
## Task
[ziptunnel2](./src/ziptunnel2)
## Solution
First, I look at this file through 010Editor:
So the file compressed with bzip2. Here's a script to decompress it:
```Python
import bz2
with open('ziptunnel2', "rb") as f:
data = f.read()
data = bz2.decompress(data)
with open("flag", "wb") as f:
f.write(data)
```
Decompressing gives us following file:
That's zip. Decompressing it will give us gzip file. If we decompress it we will get bz2 file and so on. So decompress it without automation will last too long. That's why I wrote the following script:
```Python
import gzip
import bz2
import zipfile
while 1:
try:
with zipfile.ZipFile("flag") as z:
z.extractall()
except:
with open("flag", "rb") as f:
data = f.read()
try:
data = gzip.decompress(data)
with open("flag", "wb") as f:
f.write(data)
except:
try:
data = bz2.decompress(data)
with open("flag", "wb") as f:
f.write(data)
except:
print(data)
break
```
And here we go:
Flag: `encryptCTF{f33ls_g00d_d0nt_it?}`
