Rating:
# Spentalkux
> Spentalkux ??
## Description
With such a small description, and no file attached, the first thing to do is to use your favorite search engine to find something interesting. In this case, I have found a Python library: [spentalkux](https://pypi.org/project/spentalkux/).
## Solution
### First version
Let's install it with `pip install spentalkux`. Once it is installed, I guess I could try to import it, but I prefer to look directly at the source to make sure there is nothing malicious. On my computer it is stored in the folder `python3.8/site-packages/spentalkux/__init__.py`.
```python
import base64
p="""
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
"""
exec(base64.b64decode(p.encode("ascii")))
```
So we actually have a Python code base64 encoded which is executed. Let's see what it does:
```python
import time
go_away_msgs = ["Goodbye now.", "That's your cue to leave, bro", "Exit stage left, pal", "OFF YOU POP.", "You know what I haven't got time for this", "Forking and executing rm -rf."]
time.sleep(1)
print("Hello.")
time.sleep(2)
print("Can I help you?")
time.sleep(2)
print("Oh, you're looking for something to do with *that*.")
time.sleep(2)
print("My creator left this behind but, I wonder what the key is? I don't know, but if I did I would say it's about 10 characters.")
time.sleep(4)
print("Enjoy this.")
time.sleep(1)
print("Ztpyh, Iq iir'jt vrtdtxa qzxw lhu'go gxfpkrw tz pckv bc ybtevy... *ffiieyano*. New cikm sekab gu xux cskfiwckr bs zfyo si lgmpd://zupltfvg.czw/lxo/QGvM0sa6")
time.sleep(5)
for i in go_away_msgs:
time.sleep(3)
print(i)
time.sleep(0.5)
```
Nothing special here, only prints, and a ciphertext. This is a Vigenère code, which I decrypt with [dcode](https://www.dcode.fr/chiffre-vigenere).
```
Hello, If you're reading this you've managed to find my little... *interface*. The next stage of the challenge is over at https://pastebin.com/raw/BCiT0sp6
```
So let's head there, we find a very big file:
```
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```
Using [Cyberchef](https://gchq.github.io/CyberChef/), I use the Magic tool and it recognizes an image hex encoded. (Alternatively, use `From hex -> Render image`)
We see some binary code in the image, so let's decrypt it with Cyberchef. We get `_herring`. So all of this is a red herring...
The image tells us `look back into the past`. If I return on spentalkux webpage, I see there is an older version of the package. So probably I need to begin again, but with the older version.
## Older version
Once again, I install the older version with `pip install spentalkux==0.9`, and I look at the source. I once again have a base64 encoded source, it translates as:
```python
import time
go_away_msgs = ["This is the part where you *leave*, bro.", "Look, if you don't get outta here soon ima run rm -rf on ya", "I don't want you here. GO AWAY.", "Leave me alone now.", "GOODBYE!", "I used to want you dead but...", "now I only want you gone."]
time.sleep(1)
print("Urgh. Not you again.")
time.sleep(2)
print("Fine. I'll tell you more.")
time.sleep(2)
print("...")
time.sleep(2)
print("But, being the chaotic evil I am, I'm not giving it to you in plaintext.")
time.sleep(4)
print("Enjoy this.")
time.sleep(1)
print("JA2HGSKBJI4DSZ2WGRAS6KZRLJKVEYKFJFAWSOCTNNTFCKZRF5HTGZRXJV2EKQTGJVTXUOLSIMXWI2KYNVEUCNLIKN5HK3RTJBHGIQTCM5RHIVSQGJ3C6MRLJRXXOTJYGM3XORSIJN4FUYTNIU4XAULGONGE6YLJJRAUYODLOZEWWNCNIJWWCMJXOVTEQULCJFFEGWDPK5HFUWSLI5IFOQRVKFWGU5SYJF2VQT3NNUYFGZ2MNF4EU5ZYJBJEGOCUMJWXUN3YGVSUS43QPFYGCWSIKNLWE2RYMNAWQZDKNRUTEV2VNNJDC43WGJSFU3LXLBUFU3CENZEWGQ3MGBDXS4SGLA3GMS3LIJCUEVCCONYSWOLVLEZEKY3VM4ZFEZRQPB2GCSTMJZSFSSTVPBVFAOLLMNSDCTCPK4XWMUKYORRDC43EGNTFGVCHLBDFI6BTKVVGMR2GPA3HKSSHNJSUSQKBIE")
time.sleep(5)
for i in go_away_msgs:
time.sleep(2)
print(i)
time.sleep(0.5)
```
Once again, I get a ciphertext, so I fire up Cyberchef. This time however Magic gives nothing... After some search trying different options, I find that `From base32` seems to give correct results, which are then decoded using magic. The complete translation stack is the following:
```
From base32 -> From base64 -> Gunzip -> From binary -> From binary -> From hex -> From base85
```
Flag: `ractf{My5t3r10u5_1nt3rf4c3?}`
