Rating:
## Beginner/Headache (351 solves)
Created by: `Sl4y3r_07`
> I've had a headache since last evening. Is there a magic spell that can cure it immediately?
At an original look at this challenge I got stumped for a while overlooking something very minor...
We start with a seemingly 'corrupt' file, `chal.png` which doesn't open. I check EXIF first:
```
$ exiftool chal.png
ExifTool Version Number : 12.70
File Name : chal.png
Directory : .
File Size : 90 kB
File Modification Date/Time : 2023:12:18 14:43:09+11:00
File Access Date/Time : 2023:12:18 18:10:35+11:00
File Inode Change Date/Time : 2023:12:18 18:10:33+11:00
File Permissions : -rw-rw-r--
File Type : PNG
File Type Extension : png
MIME Type : image/png
Image Width : 1265
Image Height : 687
Bit Depth : 8
Color Type : RGB with Alpha
Compression : Deflate/Inflate
Filter : Adaptive
Interlace : Noninterlaced
Image Size : 1265x687
Megapixels : 0.869
```
Nothing... Anything trying binwalk?
```
$ binwalk -e chal.png
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
41 0x29 Zlib compressed data, compressed
```
Nothing of interest in the data... So here I get stumped until I decide to check the bytes...
Files have 'signatures' (magic numbers). PNGs magic numbers are `89 50 4e 47 0d 0a 1a 0a`. This does not match our files magic numbers (`ae 71 00 ff 3d 62 24 6d`)
So... I change the files magic bytes to be the correct bytes, and we get the following image (that opens!).
There's our flag! `flag{sp3ll_15_89_50_4E_47}`
**Files:** [public.zip](https://web.archive.org/web/20231218155709/https://backdoor.infoseciitr.in/uploads?key=8823502df1ed5ebf77a70f66f2cb4d3551cc167477a7cc7d5525a04ef7559255%2Fpublic.zip)
