Please help! removing first line of php

[alexwtz]

I want to remove first line of infected php files, but i want to keep <?php

I'd attached 2 files one with the infected file to see the first line, and one with a script that eliminates the first line, but i don't know how to keep the <?php...

 

a.php is the script for cleaning

update_cron.php

a.php

[alexwtz]

i think here it needs to insert <?php in a.php al line 91

$the_content = preg_replace('/^\\s/', '', $the_content); // remove any leading whitespace.

how can i insert it?

[Ch0cu3r]

If it is the very first line of any file you want to replace with just a <?php then use

$lines = file('path/to/file.php', FILE_IGNORE_NEW_LINES); // open the file and omit new lines from end of each line, each line will be feed into an array

$lines[0] = "<?php"; // Set the very first line to a <?php tag

file_put_contents('path/to/file.php', implode(PHP_EOL, $lines)); // implode the array, add in the newlines and write the contents back to the file

[alexwtz]

these is my function, and i put the code for new line but it dosen't work

function fix_files( $files ) {
	global $hack_str;
	foreach ( $files as $file ) {
		if ( is_array($file) ) {
			fix_files($file);
		}
		else { 
			$contents = explode("\n", file_get_contents($file));
			unset($contents[0]);
			$f = fopen($file, 'w');
			if ( $f ) {
				$the_content = implode($contents, "\n");
				$the_content = preg_replace('/^\\s/', '<?php', $the_content); // remove any leading whitespace.
				$lines[0] = "<?php"; // Set the first line to a <?php tag
				fwrite($f, $the_content, strlen($the_content));
				fclose($f);
				echo "Removed first line containing <code>" .  htmlentities($hack_str) ."</code>from $file...<br />";
			}
		} 
	}
}

[Ch0cu3r]

You need to replace the code in the else statement with my three lines of code, something like

function fix_files( $files ) {
    global $hack_str;
    foreach ( $files as $file ) {
        if ( is_array($file) ) {
            fix_files($file);
        }
        else { 
            $lines = file($file, FILE_IGNORE_NEW_LINES);
            $lines[0] = "<?php"; // Set the first line to a <?php tag
            file_put_contents($file, implode(PHP_EOL, $lines));
            echo "Removed first line containing <code>" .  htmlentities($hack_str) ."</code>from $file...<br />";
            }
        } 
    }
}

[alexwtz]

it's ok but overides my firs line

 

these is the way i test it:

function fix_files( $files ) {
	global $hack_str;
	foreach ( $files as $file ) {
		if ( is_array($file) ) {
			fix_files($file);
		}
		else { 
			$contents = explode("\n", file_get_contents($file));
			unset($contents[0]);
			$f = fopen($file, 'w');
			if ( $f ) {
				$the_content = implode($contents, "\n");
				$the_content = preg_replace('/^\\s/', '<?php', $the_content); // remove any leading whitespace.
				fwrite($f, $the_content, strlen($the_content));
				fclose($f);
				$lines = file($file, FILE_IGNORE_NEW_LINES);
            			$lines[0] = "<?php"; // Set the first line to a <?php tag
            			file_put_contents($file, implode(PHP_EOL, $lines));
				echo "Removed first line containing <code>" .  htmlentities($hack_str) ."</code>from $file...<br />";
			}
		} 
	}
}

because i need to search many files to delete the code and put <?php, because i want just in the infected files to make these change

[Ch0cu3r]

 

 

it's ok but overides my firs line

I dont understand? You have files which have code like this as the very first line (shortened for readability)

<?php /*versio:3.02*/ $GLOBALS["ktrmpz"]="PaUlQzT...iIpKSk7at";        if (!function_exists('tjjluyoc')){function tjjluyoc($a, $b){$c=$GLOBALS['ktrmpz'];$d=pack('H*','626173653634'.'5f6465636f6465'); return $d(substr($c, $a, $b));};eval(tjjluyoc(561,3272));};?><?php

and you want to remove it. My code replaces that code in the first line with a <?php. It is not meant to be used with your existing code! That is why I said to replace your code in the else statement with my code!

[alexwtz]

yes i have many infected php files and i want to clean the infected code.. the script a.php makes the search and deletes the line. but i need to insert a new line with <?php or replace the code line. in a.php at line 79 is the fix code, there i need a function that after the code delets the malware to insert or replace with <?php

 

the steps ar to search and then to change, because not all files are infected.

[Ch0cu3r]

I have downloaded your a.php replaced your fix_files function with the code in my post here (although there was an error due to too many } in my code).

 

Then created a few test files, some with the infected code and some without. I then ran a.php and it removed the malicious code from the infected files.

 

So what is the issue now? I have attached the modified a.php here.

a.php

[alexwtz]

Yes it work's! Thank you very much