Charlie

Description

SIV Pipeline Forensics Group 5

charlie.jpg

Solution

Awfully big JPG file d:

└─$ file charlie.jpg
charlie.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, density 1x1, segment length 16, baseline, precision 8, 3024x4032, components 3

└─$ ls -hl charlie.jpg
-rwxrwx--- 1 root vboxsf 4.3M Jun 13 11:26 charlie.jpg

Extract files within the JPG with foremost (or binwalk)

└─$ foremost -i charlie.jpg -o out
└─$ tree out
out
├── audit.txt
├── jpg
│   └── 00000000.jpg
└── zip
    └── 00008744.zip
└─$ unzip out/zip/00008744.zip
Archive:  out/zip/00008744.zip
  inflating: flag.txt

└─$ cat flag.txt
/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBA...R0HJDn5iPujbQB//9k=

Decode and open

└─$ base64 -d flag.txt > flag
└─$ file flag
flag: JPEG image data, JFIF standard 1.01, aspect ratio, density 1x1, segment length 16, baseline, precision 8, 1000x1000, components 3

Charlie.png

Flag: SVBGR{B1NW4LK_F7N}