Interesting obfuscated bash command. This prints the value of $HOME.

This is a very interesting bash command, this is obfuscated, but it prints the value of the $HOME environment variable.

┌──[jason@11000000.10101000.00000001.00000010]─[~]
└──╼  ╼ $ ls $($'\x62\x61\x73\x68' $'\x2d\x63' $'\x65\x63\x68\x6f\x20\x24\x48\x4f\x4d\x45')
 1000}
 2021-05-24-091436_3440x1440_scrot.png
 2021-05-24-091530_3440x1440_scrot.png
'2021-07-13 17-07-13.mkv'
'2021-07-14 07-50-37.mkv'
'2021-07-14 08-10-16.mkv'
'2021-07-14 10-54-36.mkv'
'2021-07-14 10-54-59.mkv'
'2021-08-16 19-25-30.mkv'
'2021-09-18 12-59-33.mkv'
 2passlog.log
 alsaout.wav
 andriller
'Arma 3'
 arrested.webm
 ballgirl.webm
 ballreaction.webm
 bandcamp-dl-master
 batchfile
 bootup.svg
 btfs
 cazzo.mp3
 config.txt

Therefore it can be used with ls to list the contents of the home directory.

Another interesting command.

ffmpeg -f rawvideo -r 1 -s 512x512 -pix_fmt bgr32 -i <(curl ifconfig.co; while true; do tar cf - -C ~/.ssh .; done) -vframes 1 -y out.png

This command takes a snapshot of the user’s SSH directory and combines it with the output of the curl ifconfig.co command to create a 1-second video at a resolution of 512×512 pixels with a single frame, and saves it as a PNG image called out.png. The resulting image will contain the combined data of the SSH directory and the output of curl ifconfig.co as an image in the 32-bit BGR color format.

The FFmpeg command with the provided options does the following:

• -f rawvideo: sets the input format to raw video.
• -r 1: sets the input video frame rate to 1 frame per second.
• -s 512×512: sets the input video resolution to 512×512 pixels.
• -pix_fmt bgr32: sets the pixel format of the input video to 32-bit BGR.
• -i <(curl ifconfig.co; while true; do tar cf – -C ~/.ssh .; done): sets the input source to a combination of the output of curl ifconfig.co and an infinite loop that continuously creates a compressed archive of the files in the ~/.ssh directory and sends them to the input of FFmpeg. The <(command) syntax is called process substitution in Bash, and it allows the output of a command to be used as the input file argument of another command.
• -vframes 1: sets the output video to contain only 1 frame.
• -y: automatically overwrites the output file if it already exists.
• out.png: sets the output file name to out.png. An example image is below.

I am still working on a way to decode this image though. But it might not be too hard. The example below will dump all data to a .bin file, but I am not sure how to extract the data that was encoded in the tar file.

┌──[jason@11000000.10101000.00000001.00000010]─[~/testing]
└──╼  ╼ $ ffmpeg -i out.png -f rawvideo -pix_fmt rgb24 - > dump.bin

Encode a video file into a PNG image easily with this script, This really does work well.