SwampCTF 2019 - Write-ups

Table of contents
  1. 🔗Information
    1. 🔗CTF
  2. 🔗50 - Leap of Faith - Stego
  3. 🔗50 - Last Transmission - Stego

🔗Information

🔗CTF

  • Name : SwampCTF 2019
  • Website : swampctf.com
  • Type : Online
  • Format : Jeopardy
  • CTF Time : link

🔗50 - Leap of Faith - Stego

“You have to let it all go, Neo. Fear, doubt, and disbelief. Free your mind (and your stego tools).” - Morpheus, probably

-= Challenge by P4PA_0V3RL0RD =-

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$ exiftool leap_of_faith.jpeg 
ExifTool Version Number : 11.30
File Name : leap_of_faith.jpeg
Directory : .
File Size : 41 kB
File Modification Date/Time : 2019:04:07 00:18:02+02:00
File Access Date/Time : 2019:04:07 00:18:18+02:00
File Inode Change Date/Time : 2019:04:07 00:18:02+02:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Exif Byte Order : Little-endian (Intel, II)
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Modify Date : 2019:04:04 09:22:27
Exif Version : 0210
Date/Time Original : 2019:04:04 09:22:27
Flashpix Version : 0100
Color Space : Uncalibrated
Thumbnail Offset : 226
Thumbnail Length : 25217
Image Width : 720
Image Height : 480
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 : 720x480
Megapixels : 0.346
Thumbnail Image : (Binary data 25217 bytes, use -b option to extract)

$ exiftool -b -ThumbnailImage leap_of_faith.jpeg > thumb.jpg

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$ exiftool thumb.jpg 
ExifTool Version Number : 11.30
File Name : thumb.jpg
Directory : .
File Size : 25 kB
File Modification Date/Time : 2019:04:07 00:28:12+02:00
File Access Date/Time : 2019:04:07 00:28:12+02:00
File Inode Change Date/Time : 2019:04:07 00:28:12+02:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Exif Byte Order : Little-endian (Intel, II)
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Modify Date : 2019:04:04 09:23:36
Exif Version : 0210
Date/Time Original : 2019:04:04 09:23:36
Flashpix Version : 0100
Color Space : Uncalibrated
Thumbnail Offset : 226
Thumbnail Length : 5199
Image Width : 334
Image Height : 302
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 : 334x302
Megapixels : 0.101
Thumbnail Image : (Binary data 5199 bytes, use -b option to extract)

$ exiftool -b -ThumbnailImage thumb.jpg > thumb_thumb.jpg

flag{FR33_Y0UR_M1ND}

Note: stego is not forensics

🔗50 - Last Transmission - Stego

Two of our squad leaders got beamed up before they could finish their transmission, but they left a clue behind as to where they were taken.

-= Created by P4PA_0V3RL0RD =-

Original image:

Blue 0 plane:

Red 1 plane:

flag{B34M_M3_UP_SC077Y}

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