InfoSec LAB

Debugging_Interface_Intro

Created: 3 min read

Intro

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ ll           
total 10k
 12K -rw-r--r-- 1 kali kali 9.5K Apr  8  2021  debugging_interface_signal.sal

I have been give a single file; debugging_interface_signal.sal

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ file debugging_interface_signal.sal 
debugging_interface_signal.sal: Zip archive data, at least v2.0 to extract, compression method=deflate

It is an archive file according to the file command, yet I have never seen such extension; .sal

according to an online post, .sal extension appears to be associated with signal capture or it might be used exclusively by the logic analyzer from Saleae

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ 7z x debugging_interface_signal.sal 
 
7-zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,32 CPUs 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz (806D1),ASM,AES-NI)
 
scanning the drive for archives:
1 file, 9697 bytes (10 KiB)
 
extracting archive: debugging_interface_signal.sal
--
Path = debugging_interface_signal.sal
Type = zip
Physical Size = 9697
 
Everything is Ok
 
files: 2
size:       49900
compressed: 9697

7z was able to extract content from the .sal archive

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ ll
total 75K
4.0k drwxr-xr-x 2 kali kali 4.0k aug 24 10:01  .
4.0k drwxr-xr-x 4 kali kali 4.0k aug 24 09:36  ..
 12K -rw-r--r-- 1 kali kali 9.5K Apr  8  2021  debugging_interface_signal.sal
 24K -rw-r--r-- 1 kali kali  22K Mar 23  2021  digital-0.bin
 28K -rw-r--r-- 1 kali kali  28K Mar 23  2021  meta.json

2 files came out;

  • meta.json
    • likely a JSON metadata
  • digital-0.bin
    • appears to be a binary file

meta.json

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ cat meta.json           
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The meta.json file appears to contains lots of digital signals While they still appear vague, the digital-0.bin file can also be seen included at the end

digital-0.bin

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ file digital-0.bin                 
digital-0.bin: data

It just shows data

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ cat digital-0.bin       
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E��n��d��
 
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While the content appears to be an arbitrary data, it appears to have a header at the top; <SALEAE> That suggests that this has to do with SALEAE

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