Hidden in Plain Sight

Challenge

Make sure you take a real close look at it, it should be right there! /home/plain_sight/ or download it here

Solution

We get an ELF binary, when we run it we get

1
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3
4
5

Make sure you pay close attention!
Okey, ready? (y/n)
Sorry, too late!
....
Dang, that was fast! Did you get it?

We disassemble the file and find this segment of asm code

[..]
8048512:	50                   	push   eax
8048513:	e8 38 fe ff ff       	call   8048350 <fflush@plt>
8048518:	83 c4 10             	add    esp,0x10
804851b:	b0 49                	mov    al,0x49
804851d:	b0 63                	mov    al,0x63
804851f:	b0 65                	mov    al,0x65
8048521:	b0 43                	mov    al,0x43
8048523:	b0 54                	mov    al,0x54
8048525:	b0 46                	mov    al,0x46
8048527:	b0 7b                	mov    al,0x7b
8048529:	b0 6c                	mov    al,0x6c
804852b:	b0 6f                	mov    al,0x6f
804852d:	b0 6f                	mov    al,0x6f
804852f:	b0 6b                	mov    al,0x6b
8048531:	b0 5f                	mov    al,0x5f
8048533:	b0 6d                	mov    al,0x6d
8048535:	b0 6f                	mov    al,0x6f
8048537:	b0 6d                	mov    al,0x6d
8048539:	b0 5f                	mov    al,0x5f
804853b:	b0 49                	mov    al,0x49
804853d:	b0 5f                	mov    al,0x5f
804853f:	b0 66                	mov    al,0x66
8048541:	b0 6f                	mov    al,0x6f
8048543:	b0 75                	mov    al,0x75
8048545:	b0 6e                	mov    al,0x6e
8048547:	b0 64                	mov    al,0x64
8048549:	b0 5f                	mov    al,0x5f
804854b:	b0 69                	mov    al,0x69
804854d:	b0 74                	mov    al,0x74
804854f:	b0 7d                	mov    al,0x7d
8048551:	c7 45 f4 00 00 00 00 	mov    DWORD PTR [ebp-0xc],0x0
8048558:	eb 2f                	jmp    8048589 <main+0xde>
[..]

converting these hex values to characters gives the flag

Flag