ALPHASE

Aku ingin menjadi cukup kuat. Kemarin aku telah menjadi kuat, tetapi itu tidak cukup.

picoCTF - CanYouSee


  • URL: https://play.picoctf.org/practice/challenge/408
  • Title: CanYouSee
  • Tags: Easy, Forensics, picoCTF 2024, browser_webshell_solvable
  • Author: Mubarak Mikail
  • Started: 15 July 2025
  • Solved: 15 July 2025
  • Description: How about some hide and seek? Download this file here.

After downloading the file, I unzipped it.

strikingsoul@ramones:~/Downloads$ unzip unknown.zip 
Archive:  unknown.zip
  inflating: ukn_reality.jpg

The archived file contains only one .png file. This is the image

alt text

Looks cool! First, I used exiftool to check the image

strikingsoul@ramones:~/Downloads$ exiftool ukn_reality.jpg 
ExifTool Version Number         : 12.76
File Name                       : ukn_reality.jpg
Directory                       : .
File Size                       : 2.3 MB
File Modification Date/Time     : 2024:03:12 07:05:57+07:00
File Access Date/Time           : 2026:01:26 12:19:44+07:00
File Inode Change Date/Time     : 2026:01:26 12:18:41+07:00
File Permissions                : -rw-r--r--
File Type                       : JPEG
File Type Extension             : jpg
MIME Type                       : image/jpeg
JFIF Version                    : 1.01
Resolution Unit                 : inches
X Resolution                    : 72
Y Resolution                    : 72
XMP Toolkit                     : Image::ExifTool 11.88
Attribution URL                 : cGljb0NURntNRTc0RDQ3QV9ISUREM05fZDhjMzgxZmR9Cg==
Image Width                     : 4308
Image Height                    : 2875
Encoding Process                : Baseline DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Image Size                      : 4308x2875
Megapixels                      : 12.4

Focus on the attribution URL, it looked like it’s a base64 encoded message

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picoCTF - Secret of the Polyglot


  • URL: https://play.picoctf.org/practice/challenge/423
  • Title: RED
  • Tags: Easy, Forensics, picoCTF 2024, file_format, polyglot
  • Author: SYREAL
  • Started: 15 July 2025
  • Solved: 15 July 2025
  • Description: The Network Operations Center (NOC) of your local institution picked up a suspicious file, they’re getting conflicting information on what type of file it is. They’ve brought you in as an external expert to examine the file. Can you extract all the information from this strange file? Download the suspicious file here.

After downloading flag2of2.pdf, my browser automatically showed the pdf

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