The beginning of this level looks a little barren, but we find interesting stuff after some investigation.
leviathan4@leviathan:~$ ls
leviathan4@leviathan:~$ ls -asl
total 28
4 drwxr-xr-x 1 leviathan4 leviathan4 4096 Sep 15 00:22 .
4 drwxr-xr-x 1 root root 4096 Sep 13 11:08 ..
4 -rw-r--r-- 1 leviathan4 leviathan4 220 Apr 9 2014 .bash_logout
4 -rw-r--r-- 1 leviathan4 leviathan4 3637 Apr 9 2014 .bashrc
4 drwx------ 2 leviathan4 leviathan4 4096 Sep 15 00:22 .cache
4 -rw-r--r-- 1 leviathan4 leviathan4 675 Apr 9 2014 .profile
4 dr-xr-x--- 2 root leviathan4 4096 Sep 13 11:08 .trash
leviathan4@leviathan:~$ cd .trash/
leviathan4@leviathan:~/.trash$ ls
bin
leviathan4@leviathan:~/.trash$ file bin
bin: setuid ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=58046a7bfbedab2f6a7d5c8e9a97f32c3358e7e7, not stripped
leviathan4@leviathan:~/.trash$
Executing it gives us the following:
leviathan4@leviathan:~/.trash$ ./bin
01010100 01101001 01110100 01101000 00110100 01100011 01101111 01101011 01100101 01101001 00001010
From here, it’s an easy guess that this is the password to the next level. I wish I could say I knew an easy way off the top of my head to translate this into ascii using only linux tools, but I don’t. I’m a little ashamed to admit this, but I just manually converted it. If you change all of the binary to decimal, you get these numbers: 84 105 116 104 52 99 111 107 101 105 10 I’ll leave the final exercise of finding the corresponding ascii values to the reader.