Exf at 12:12, 26 September 2022

2022-09-26T12:12:22Z

← Older revision		Revision as of 12:12, 26 September 2022
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	===Description===		===Description===
	On linux, quite often you will see files without any extensions. You must find out what kind of files they are so that you can choose appropriate tools to use on them.		On linux, quite often you will see files without any extensions. You must find out what kind of files they are so that you can choose appropriate tools to use on them.

Exf: Created page with "===Description=== On linux, quite often you will see files without any extensions. You must find out what kind of files they are so that you can choose appropriate tools to use on them. 50pts ===Question=== Inspect this file and get the flag `/var/unknown/file` ===Solution=== First, I go to the folder where the file is located using the `cd` command. Next, I examine which file it is using the `file` command. I find out that the file is <..."

2022-09-26T12:11:39Z

Created page with "===Description=== On linux, quite often you will see files without any extensions. You must find out what kind of files they are so that you can choose appropriate tools to use on them. 50pts ===Question=== Inspect this file and get the flag <code>/var/unknown/file</code> ===Solution=== First, I go to the folder where the file is located using the <code>cd</code> command. Next, I examine which file it is using the <code>file</code> command. I find out that the file is <..."

New page

===Description===
On linux, quite often you will see files without any extensions. You must find out what kind of files they are so that you can choose appropriate tools to use on them.

50pts
===Question===
Inspect this file and get the flag
<code>/var/unknown/file</code>
===Solution===
First, I go to the folder where the file is located using the <code>cd</code> command. Next, I examine which file it is using the <code>file</code> command. I find out that the file is <code>Zip archive data, at least v1.0 to extract, compression method=store</code>

I could directly use the <code>unzip</code> command, but I know that it doesn't like to accept extensionless files every time, so I decide to copy the original file to a new name with the <code>cp</code> command just in case.

Next, I unzip the file.

I use the cat command to display the contents of the file and find that the data is encoded so I try to decode it with the base64 encoder. I have to repeat this a total of three times to get the flag.
===Tools===
*file
*unzip
*cat
*base64
===Flag===
<code>ctf-tech{d7a2af26-7a1a}</code>
===Links===
*[[CTF Challenges | Back to CTF Challenges page]]

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Exf at 12:12, 26 September 2022