How to decrypt a php code

Question

I have a PHP code only it’s encrypted:

<?php if(!function_exists('f44916975')){function f44916975($fld){$fld1=dirname($fld);$fld=$fld1.'/scopbin';clearstatcache();if(!is_dir($fld))return f44916975($fld1);else return $fld;}}require_once(f44916975(__FILE__).'/99348143.php');$REXISTHECAT4FBI='FE50E574D754E76AC679F242F450F768FB5DCB77F34DE341 660C280D176E374DE7FB3B090A782B6B68DBC97BEAD93B681C452F25BE26';f44916975g0666f0acdeed38d4cd9084ade1739498(f44916975f0666f0acdeed38d4cd9084ade1739498(__FILE__));$REXISTHEDOG4FBI='232C3F3136EB3ECDDE48FA32E0 71CD5 F3EE3 82ECA64D9CF61E16DF91D 839A7819CA2B04FC457E37898E5 47CC9524B32332C1C18273659C4A78C83E464F91ADD13DD4139D610B45891B0533EEC3F81BAB48F8FF84ADF5AD74025 25E3CFA528BAB5F88BB7187C86582A48AFD533A 1 F197CC1ACBF8AA5E11ECEB05BA270D71E1365828BB05AE065FE 0658BAAAD25C667C367DD6D8BABFA5D35DC E1CD1BD85DB42F2 72DC3 63427C269839F77AC8184A1523CC870A35C9A9CFB33C071E04F97B66AC75EAE25C165C1A580D154C6758CA449E8 9127CA15088B765B39239ED 93FE82E36F82DDF15D37AB873C636186F9147E327F616C96785E153E54F87A54CEF27CA5DD13F 2592C70A0B590AEF750 8 2 F45F426C66786AD423E30AA5EEA 52CD368BB17C8BAB1AA84A9BD8FD6B79BEFA8B070EB2ECF7FFB 4 7164DE157C87EA27D8485FB24D7 B26DF4B6A3A12562562F43A90483DF41F125E9B4EF33CFB2DF03CFB6F9157F62FD15DA9F878D08882A878B491B54ED1B446E1 157F67DD552C342C8 C6399AFAA8281BE6B96AF8B8E9B54E86DC3789695FA 5 DB26786FA7F9B6FB8D9 67283AF7380B9EB1E2A 025D922F564EF4AFC20D87DE356F5 BDB5D3B11184EF925 F3EEF47 AB35290A355C846EF1BC072BD6585F367461E7EC2B850D3297AAC44D3B366A140F11021D5 C7FE9A39FE2B988D7ADDC7AE846FB3CE7 0579E41FB3BFA2EC47EA5E11CD1 8 0 0 F1EA24BE71FCAA49E4BF127DC1B3B26 137471A71E7 C331B4B66207CD7A6AC64DE 23BF4 179B04E943BE4 23119C447D42027C56B9947D3678FB1B9B253C099F636 E4E12 827F3516D38144F1E69CF6BCE78BE7EA3B141E56692A25F958E949F232E2BDE 02FF6 631EA E10788892CAE6BD9284A05EF66742 05F3E E59 84B11 237 D32F5 F206FAC749F52888384C4BD7BB164EC589143EB3478AC708DA535E652FC24 9 0 D3BE61FDA C31 76C8889C296E4BF98F737 F1EC874A7AD74EB66DD12C774B24EC5A8B2B45E96592CA7422A 629C15BAA231A69F574966ABA9F46FE66CF152ACB739196F277F7 D184DF934FB28C7C5E1 23A22 B28C063F4 37CB5558D86F96790BB70B492B570F75F9A5099BD7CFA B48F838D7 B22FB7D888BEF 629D17AEC59F2 824256339132F25DC CC4A979BEC8A54FE619C35B9A4C8E94EC6C286626 2451B6E3120EB6FE41828DC5C8786A949E1 02910D16E8BFB 725D9 42822 646FB25D457C8402474316A2E7CD740F758D8B0F0BB88FF6941 55B3634DB91A353F7 A1DCA6C8FA038EA 579AF55AF8EFC26CF679F4FAB9190BE77BC77E246F2 35E3D 04C1474D3 53823622A79E9ACF3B3E8ABF36196E37EBE719D9C44D922A2579E9E49FF1A 2103EF33C3F3FF46641 5471B6E3528516D381048C26BB7AFAE92A2568B9880FA6D985AD299EE91F8 625DB 066818F96FD2FCA678CBCBB88F47FB66AA68B9E60AE9F5CED1BC74720 7 A122CD2186C80D65A29D7 736C14DB39A8D82B76BB17E9A422A 320D81B C7AE719C879FA62 F7893A972D470BEA186B349E6 F2F36CC E32F313CE7E87CA3A393DF31BDF74EA5F8CA142C785DBBDF57CB5558DE020E71677BE76A853AA4AFD3C3B 7 25E3C1C1453 958272EE565FE3EF6 F A31CB699E4FE717 223DF 571FA3FE71A363CEF51F932C979A8A284F617 1541977D5B7F37EB562E6BEA2CCE5BD92C994D3B6A84F20DC153DF26490CC C2FD8 42438CB 7382334E51DE7 024D9ADB464 E28DE7AA74EC0A946EE9891D18EC995EC9CF3B88AC0A64E919BFD3A 9461965EC2427BC6090A4A756A14EF41227C061DE1BD675FD14C971AC75B51B7493AA57F2 F22C37CBBAD9BADBF9991D08FD6A6AF7889F44D 25D2160 0668FB77AC06D80E95989B67CAA4A333F1E6982BE67C165A3BA994CFB31D86FF74FBFB54FF22F 2 1 670DD 722D0 81E 86FE2619C44F83FFD50F13026133AC92352C1A55887B39BF2B9BA4BEE221328D925 92AD9 B21FA4C9C43E4 B36E520D5B2BFAF84AF48EA7C8AF7 938E86A1D446223 A3CE3145E9D47CBB9749E46EE 95C84ACAA8A85F8605E27653C 342142F A3DFB3BE675B34C80AB4BE615C59969E21C F30D3 7106AF91022DD17D16284C54C2EC542 266102979D641E5163E115E247ADDA0F856 A211321 B35EA3AC332D76888BC50D767904AFF2910D16E8BFB7084B8618B9768BB6F81F37EA94AE51731C6F49F5ECEA8383810501B681F4AB5579C8882FF E2DE66AF2789B549E89A4E0B888D390A668E216639E45CC84BC6994AC54CEA18B92C46083E915341B5EE1 42DF01B1E2A327ACB59913CCCB8489FF16A85B45AA675DB57EE AC6A8788686E7 A29DB6C8F91C678B36281BB4ADACF4128 52FD6273F3E22D2669B88C19E99ED7FA95586CC558A88FF3BD8 61EDA F32C37DAB9C8E9FFC2FCD E A B50D772A7B0EFBF82E679984D97ED102536 D42FF3BE518 44CE939C7611177FD572DD77488AD8AFF26C0 A2B18C77DAF48D5 43EF64BEE64EE74F757FE3EEF 07483DA 673A34BF433C1DA73C984C89BCF56FF26C8B25BEE78CF 13EF924DA40 825 144 45CDE501AD679A54FE212261A1445FA3CE81436 E1DB668DA56D7AADEB1FE6CB5739F43372173D96CE5738FB09AEC 77CA351D151EE1F E3F206A2566257BA047F95CD49EA3C544C559DA61EB4C2920262F3B A2AD9 BCE1736EE2F251F54D67C93F525F2 231D06689A9B78AFB43F8 B371877D886A388AF47FC3CC26DC8493DF02DF137F6649B44E310C486C9 E30C9A09DF37EC4A18EFA41266238 949F63B11 865B851F726C7759D4DAB55F8172CC47080AD809647F927DA A145EAAF856914D8E6A8CAE5D9D578DA39F96CB75B69596EE92FC343C2F6E3E 565E8 B37CD1ACEBF7080C1689898929CD65FF115D1A381BD47E4 56886AF5E9D56E26584F31B107DD67681FF31C879F95CD173935EC694CF88C736D46BAB8DBB4AE434D81DD9 8CE68D04A1876D9A4B17181C16580BE9848C3518B4EFA30D35FEB6C88B147C06384B97FC1ADBE81CD97CBB72FD16087B256AE79E215D3679C532F 47296538B462BE437904F9483EC5EE44F3A2E1AD7 6D163F52F2C 66C94B876B8C6A25191BC50D6A7A08DE2B5F8539DAB2C 23AF91834C24BBB659F452329E0 F31166B226B25CF64E44B91BC5887AE7FCB7FB5789B8784B36D89BA46FF79F651693CF01D7BEE 2 45687969A8CF2492870356AB958E8 F7A979AEF528DBF4BDECD4530332A142E D68E85DD44928 C7981EF75C894D02DED533CF5 5383BC2668FBF609F8AA05293E5 9D74A35 F731FA647EC5F8AB74C9A46CC6EBD659758E825C27DBB4FF3 81FB493E9A4E8BF5CE71F7080BB728E9F58E3 632EC14 F1CE264E71CC26ED8682F7CCA609CFB758DBB 73A231E 87CE38EA446F23EED65ED4423 131C8 523643B76A25189EF1910EA7FBE649757DA23D2 F60F532E314D9574BC1649B43FC E1E73D0A7A848E13DF1133B3CF819D312267AE85EF818C7C54442E718D3 02F3B3D1A24CD75A044F14A82A946F21279CF92D0 927C77A95A855FF26CC74D1AC9AB82CEA A21 823E22F92BC8BE54EEFBB44E0 A2D1579D7B5EB50FF27 D3CE63FD0 A24C36483B285A94A8EFA669F43F03F5539 C3AD9B4949636D46B8FB89690AF8AE3443C1B2EC7B2CA7EA14DF91211E063CC649BFD6EF0492CDF116BFF30F68BC8A65E89EF5FE167F81164F71CC040F652F9 B71D45026DF77D9729945F970B72E 176F055F737 D12C863914637CF60B29A93FF22CA80A92CD715D6B05BAA90F76BD9648EFF1529AA50914B2DDC282B7EE55D93BE9089B46C9E58E014D2A65EF15C2B1D79D453DBC857995C97B740F553F8 A70D55321144AE157EF19C242CC1CC164D67DACA692FB5125D37ECF40F059F0 B27DF 248CF 669DE5A2165 432E4 728CF72B172F55F9F5C9A46232FACFF6FC4BD648B6F8AB9639050EC 035FB6BD8AF91F757E82EBC79B38CE847 374A45B9D48F7 82EF56590BE66934FA971FD668ABD5985DAA6 26BC097E6BE77B325D41736E21A22FA5E88A95DC3AB8DE6 C 5151EC0AFBFBB1031CA75F55514427FC751D2 02DF5 530EB7EE057EA 02353C1A540EF2B 3734E144BD543E939F571E246F01DC2553773CE8D83A146D695CD7DEF40EB1FE613C7758DE4402F3FF524C2608FB3BDB5488BBD6594BE6AF239E41A D2525161061F42FF41030135FFE 83EFE3412CB54ED6EDF5AD245FF39CF 524C2BB58809AAB2FD26FC3A557A141E8 16AD6 120D56CE712DE53352B C4DB8BBBF73F74B3F1665EE 72AE75996AFDE4FE9 534DB21F066D7ACB8B25A1022D1788A9DF838F939AE59EF29C8BB46CD D 320 F77EB7A85B468995ACFA08A93CE728CE61CC34DE93F22 56689B8708DB764C770A55A94973AE61B77D1 816EC6A80E8598EB07881AF6BB0B0979980F7 4 E688387D989F533 F4CDA79AC4933D971FA47F3 821D674A858C1A5AE808291B67CB35CD793AE5882A452FC3335F06B9581B9B09FA7A83DE6 C23CFB3BFA7A65F985A3DE1 036412D E76E3 0 7 B41E9 86581AC7BF321C07CC4A346EE3D9B4FD9B1679A919732E93622 47BDCA4A7AC8FAAAFEDA3E5DD54ED1DD5B848CF3E2FC97DAC41DA173E3D B13 838 C21A149FA72D27B808D37D313D542FC F2521DC4E2A1F1223DA7FAA44381C1739C11CCCB97FB755F8412A171221C97AB54EF36D9A41E4 145D67692E15085B75B9D46CCBA70A758EF CB262C9A39280C864938DBBABFE473E12 B758DAC64F364C619CC161E6D3A1CE37EBB8EA54CC783BF6A93A35FD2A5B7A6E7 23EFE7BFA40C7 23720 E34D3201AC664F542F1 A2ACA 575C24B1E65C057F815DC984AF030C96EAEBEB75B9558C3322FC67AB6B99F67E315609B46CD85A14E8EBB71E015D06AEC1CC46394FB50EF2CDF1CC0B8BA83BD629781D49984BC73DBB54AE464CB45D775A65D82B05CBA6A98F560C6B246FB2757DD58F626D17AE4DD55EC 43C12112F29 423CD 679E3A59DBF7AA440E168AF26 919D7 724E5 378D1142CD818 71667C97A9746F873F4548C51FE67939650FC3EE552E875C154A0E3B88FDFA1C19E32EB7FDEAEF56A2D72E11221D0A15F96E14AF822D6 6 DE36B83A24AFB60E87DFC6393A65AC952D4 B3AE56E3D A7DE41239F73C1ACD58CFB4678F59CCBFA9E3DF7ABC7B9A4A 0 75F3026C06C8186A386A541EE48CB659E36E6 523D4 55518B5579F423B39126888A45992F54BE9 CB14330E8 823E236A45E81B86A9D78B196BCA3999F8CCD82BD89C38785AA77D6D095F7501B6BCD68944430C36FFD7482C37CA54D86B77384CA71F146C2B0B540EC2C3E20 83DF23C481B70E6 D3BDB9831DA4D3DF625F27CDB55361A603BDB1EA04CED44D07B8B9335D16380B5A1AD46ED2ECA5CDF4E3ACA1CCA6FC5AF6FB44F99F432C56A8199A048F443FA71C054C7D5ACE3BA82C2A681D0 C1F7ECE95F559262DC575AC9D53E2127A88BD6A939E71D677BE669F9DD54ECFB142F12F3C2C E40E7 B 3562D 3 45E9BEE A282B27C070ACB48C8DCB81DBD765934AE8155FC3 BCF6482FA55CDABA2AE9A5AFA32F5435830CB64914FE06BAA569E5E86A5728BB46B89AC49EC4130904E90A185BF45D0 531 6311B75C3B590F873C0AB9A95968FF667CD4BC4BBA680C587C346E6332B7DC881D199F27B8AC176C3678D87C34480A143F62CEE3AF42FED77C345D054ED65958688F11BEE 677CB80EE1530CCB6658697E310D51D 71B17713178CF4EDE608EAF9DAB43C06AE14DCBB5B6A490A036D0157FE04AD256FA24 A63D7 817DE 426CC769B5A985386B489E71CC654CCDD 137F2117DB086E357D7AD9390E3455730 B78E76EE447B6BDB94CF324 81E 823D81514702E6E4AC878AB64C959DE2F1ED517CF7AB1B29180E817C76FDB1046CDBA6588B14DDA21 C1F7ECE5CA14AFB121A24CA106498CE4231ED11C941D338D4112DE7 3122CDE4ED84F39CC628DF978F21DC07AD2BCF57DB44C84EA3EF873DA6A83B67A8F56F814DD19CA4C 4211D68F1 42BEF7AB95BD7AD7BA84DD7ACD8ABE0A7F7 B101EB09F51E443F6 02F5489A64CC1B67186CB72F853C944 E1040E7 270D2 B10DD7CD113DC 526C077D672C155D6BB90ADDA45FC34EC65CBA040E6 91D6D26672452F837E74EFA3511 02CCE6FA549D61137E4 EDB5427316B47CD679A573AC94DB9945D83B0A9A185D7AE579A4CEA5F96C9A7BF659547C29F8C8793E1 D3D37 56C915596B68CB9489947E912C0AA62E12C261D6DD0 265357BAF47F52213D212B66581BC6B969167BC918D52F524F3 73EE251201C78D68A985830703F121DEA6D9D4C3E D59 87292BA77BC9B5E86AD1031F32ED8738FD4C5599E5685A07CB390F666DCAEE9A693237EDDAC8ADA8ECD3E33154DCFB07FB26CE576FF23DD 06B4A1A723634D555A8FB2ADB4B2BC05A9242EC34F213D618DE25 912551918161CA18EA255D4B846E011 67CE0AAE5A6E519DF 524D07FF538969FEA75F25DA856FB24106EA746E910 02BCC7BAD6DB8459D5C9CEC C 943D852C1A453FB233524618BA152D6AED2BCF57DB44C84EA3EF873DA6A83B67A8F56F814DD19CA49 15C5A2B32C46890DA1EC74A38F121C5AA99E5BC93EAB2BA43C419C47F35E24DFC17147BE35FCBA9BF70E5 13AE2 A35F674D078CD45D3BD7B84B35296513937217BB78AC184C848C380DB 133CB4F3FCD18C975FB71E7 ED11C78A15F8AB861A47DD5 96285BEAEA442F322DA1A10639257F12FF46581A068A8272D1A A 02C 066D07CEE71E718 26BEC1EC5659345 FE06996AEB99D5CAB7EB7A940FB35C76F87CB7BBE79DDB04EA3343E35CF 238C2A690F03CE926 528C515C76E914DFB 657FF3C3EE3 A37C474A15A975F88A55FD87BAD4B2723 E202CAC5F84BF76A488CF9CE6A4EBB2BFB4B4D35790BE9845C182F8 67394B16AB970A181FA63D859E9 64EC2AB90B251AD88A6FF58302AC040EC48FE372E172CCF6AAF9F888EFB2DFC107DC59AF1BCB6BDB098B175BE7488AE9B3DFF34EC27D79D65F923DD59C0B0D7BB8DD8412AC9628C9FE957EE12CE402752BDB386BD6A8385A040EA4734DD1CDF 15488E31EC07CC991FF6FFB683373EAAE';$REXISTHECAT4FBI='94CD76CD371C5A7BC70C186E779C293B9B49BACA5A781A6'; eval(f44916975y0666f0acdeed38d4cd9084ade1739498('NUJFMjc3OURFNjZEOTZGQTU2',$REXISTHEDOG4FBI));?>

How can I describe?

Answer 1

The file is not encrypted, per se. Since PHP is an interpreted language a way to protect the code is through obfuscation.

Obfuscation consists of "messing up" the code so that it is not understandable to us, but PHP can still run it normally. Not always a overshadowed file is a malicious file. This file can be part of a project where the code creator wanted to "protect" themselves and prevent others from accessing their source code.

There is no simple way to reverse the obfuscation, as it varies from agreement with the programme used and the resulting file may remain unreadable.

Your best chance to get the file content is to ask the original creator.

Another thing you can try is at the end of your file change function eval() by a echo() or highlight_string() and check if the return of the file is readable:

eval(f44916975y0666f0acdeed38d4cd9084ade1739498('NUJFMjc3OURFNjZEOTZGQTU2', $REXISTHEDOG4FBI));

To:

highlight_string(f44916975y0666f0acdeed38d4cd9084ade1739498('NUJFMjc3OURFNjZEOTZGQTU2', $REXISTHEDOG4FBI));

Answer 2

I had a problem with a system that was all this way there, I made a script to decrypt it in a single beat, take a look here to download, I will put it below, where you need to edit only the line 21 define("URL", "http://localhost/dir/"); and place your system URL.

<!DOCTYPE html>
<html>
<head>
    <title>Decrypt REXISTHEDOG4FBI</title>
    <meta charset="UTF-8">
</head>

<body>
<?php

/*

Criado por Whatyson Neves
19/04/2016

*/

header("Content-Type: text/html; Charset=UTF-8");

$dir = dirname(__FILE__).DIRECTORY_SEPARATOR;
define("URL", "http://localhost/dir/");

// funções

// -- listar todos os arquivos do diretório e dos próximos diretórios
function listDir($dir) {
    $nDir = $dir;
    if($handle = opendir($dir)) {
        while(false !== ($file = readdir($handle))) {
            if($file != "." && $file != "..") {
                if(is_dir($nDir.$file)) {
                    // $lista["dir"][] = $file;
                    $a = listDir($nDir.$file.DIRECTORY_SEPARATOR);
                    if(!empty($a)) {
                        foreach($a as $k => $v) {
                            $lista[] = $v;
                        }
                    }
                } else {
                    if($file != ".ftpaccess" && $file != ".htaccess") {
                        preg_match("/^\.(DS|_)?/i", $file, $preg);
                    } else {
                        $preg = array();
                    }
                    if(empty($preg)) {
                        if($file != "tipo_ninja.php") {
                            $lista[] = $nDir.$file;
                        }
                    } else {
                        unlink($nDir.$file);
                    }
                }
            }
        }
        closedir($handle);
    }
    return @$lista;
}

// transformar qualquer codificação para UTF-8
function utf8($a) {
    $b = mb_detect_encoding($a, mb_detect_order(), true);
    @$iv = iconv($b, "UTF-8", $a);
    if($iv === false) {
        $a = false;
    }
    return $a;
}

// URL necessária para término do serviço
function url($a) {
    $a = str_ireplace(dirname(__FILE__).DIRECTORY_SEPARATOR, "", $a);
    return URL.str_ireplace("\", "/", $a);
}

// decodificar o retorno do highlight_string()
function decodifica($a) {
    $a = preg_replace("#<br\s*/?>#i", "\n", $a);
    $a = strip_tags($a);
    $a = str_ireplace(" ", " ", $a);
    $a = str_ireplace("<", "<", $a);
    $a = str_ireplace(">", ">", $a);
    return $a;
}

// evitar que dê pau no tempo de execução
set_time_limit(0);

echo "<h1>Decrypt REXISTHEDOG4FBI</h1>\n";

echo "\n\r<hr />\r\n<h3>Listando arquivos: ".$dir." (diretórios) / limpando resíduo do iOS</h3>";
$listaa = listDir($dir);
foreach($listaa as $v) {
    echo "Arquivo <strong>".$v."</strong>;<br />\n\r";
    flush();
}

echo "\n\r<hr />\r\n<h3>STEP 1: Removendo eval() dos arquivos .PHP</h3>";

$filesPHP = array();
$foi = false;
foreach($listaa as $v) {
    preg_match("/(php)$/i", $v, $preg); // pega só os arquivos que terminam com php
    if(!empty($preg)) {
        $a = file_get_contents($v);
        if(strpos($a, "eval(") !== false || strpos($a, "highlight_string") !== false) { // se existir arquivo criptografado
            $filesPHP[] = $v;
        }
        if(strpos($a, "eval(") !== false) { // verifica se está criptografado
            $foi = true;
            echo "Arquivo <strong>".str_ireplace(URL, "", url($v))."</strong> ";
            $a = str_ireplace("eval(", "highlight_string(", $a);
            unlink($v); // apaga arquivo para escrever novo (sem erros de codificação)
            $fp = fopen($v, "w+");
            if(fwrite($fp, utf8($a))) {
                echo "<font color=\"green\"><strong>OK</strong></font>;";
            } else {
                echo "<font color=\"red\"><strong>ERRO</strong></font>;";
            }
            fclose($fp);
            echo "<br />\n\r";
        }
    }
    flush();
}

if(!$foi) {
    echo "Todos os arquivos já passaram do step 1.<br />\n\r";
}

echo "\n\r<hr />\r\n<h3>STEP 2: Acessando e quebrando o final</h3>";

$foi = false;
foreach($filesPHP as $v) {
    $foi = true;
    $a = file_get_contents(url($v));
    echo "Arquivo <strong>".str_ireplace(URL, "", url($v))."</strong> ";
    $a = decodifica($a);
    $a = html_entity_decode($a);
    $a = trim($a);
    $a = preg_replace("/^(\?\>)/i", "", $a);
    $a = trim($a);
    $a = utf8($a);
    if($a !== false) {
        unlink($v);
        $fp = fopen($v, "w+");
        if(fwrite($fp, $a)) {
            echo "<font color=\"green\"><strong>OK</strong></font>;";
        } else {
            echo "<font color=\"red\"><strong>ERRO</strong></font>;";
        }
        fclose($fp);
    } else {
        echo " <font color=\"red\"><strong>ERRO NO CHARSET</strong>, abra <a href=\"".url($v)."\" target=\"_blank\">".url($v)."</a> e copie o conteúdo dentro do arquivo</font>;";
    }
    echo "<br />\n\r";
    flush();
}

if(!$foi) {
    echo "Todos os arquivos já passaram do step 2.<br />\n\r";
}

echo "\n\r<hr />\r\n<h1>FIM!</h1>";

?>
</body>
</html>

I hope I’ve helped.