Ransom Reversing Challenge

I’m stuck on trying to decrypt the file. I read the assembly and understood how the encryption works. I’m able to generate a decrypted xlsx file, but there’s a few extra bytes that are messing the zip format and I can’t extract it fully. Need some help please.

Nvm, I figured it out.

got any tips?

What to do if Im noob and don’t know where to start

@purplebyteone said:
What to do if Im noob and don’t know where to start

It depends on your Background. Do know Reverse Engineering? The List GitHub - tylerha97/awesome-reversing: A curated list of awesome reversing resources has some Book, Courses. The RE101 102 are now Reverse Engineering 101 ??

For Malware use always a isolated VM, e.g remnux or FlareVM

You can always check with strings, ldd,… and IDA/Ghidra

And ask at HTB discord binexp-and-re channel.