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cryptam-cli.php
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cryptam-cli.php
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<?PHP
/*
* v2.0 May 17 2018
* cryptam-cli.php: tyLabs.com Cryptam - general library
* reusable analyse document functions
*/
$docdir = "./";
$doctempdir = "/tmp/"; //temporary writeable folder
$global_zip = 'unzip -n';
$global_paranoid = 0;
function analyseDocx($path) {
global $global_zip;
$results = array();
$archive_dir = $path.".zarchive".uniqid()."/";
$unarchive_out = exec("$global_zip ".escapeshellarg($path)." -d ".escapeshellarg($archive_dir)." > /dev/null");
if (file_exists($archive_dir)) {
$it = new RecursiveDirectoryIterator($archive_dir);
foreach (new RecursiveIteratorIterator($it) as $filename) {
//echo $filename." ".$fileinfo['extension']."\n";
chmod($filename, 0755);
$fileinfo = pathinfo($filename);
$newname = $path.".".uniqid()."-".$fileinfo['basename'];
if ($fileinfo['basename'] != '.' && $fileinfo['basename'] != '..' ) {
//if (stristr($fileinfo['basename'], "activeX" ) || $fileinfo['extension'] != 'xml') {
//echo " running". $filename."\n";
copy($filename, $newname);
//run it
$result = array();
if ($fileinfo['extension'] == 'xml' || $fileinfo['extension'] == 'rels') {
$result = stringScan(file_get_contents($newname));
if ($fileinfo['extension'] == 'xml' && $result['severity'] == 0) {
$result = stringScan(stripXML(file_get_contents($newname)));
}
} else
$result = analyseDoc($newname);
if ($result['severity'] > 0)
$results[$fileinfo['basename']] = $result;
else
unlink($newname);
//}
}
//unlink($filename);
}
foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($archive_dir, FilesystemIterator::SKIP_DOTS), RecursiveIteratorIterator::CHILD_FIRST) as $path) {
$path->isFile() ? unlink($path->getPathname()) : rmdir($path->getPathname());
}
rmdir($archive_dir);
} else {
echo "unzip has failed\n";
}
return $results;
}
//option to plaintext scan only for open xml trusted formats that won't have embedded executables in xor
function analyseDoc($filename) {
global $global_engine, $global_true_keys, $global_yara_sig, $global_zip, $global_paranoid;
$md5 = md5_file($filename);
$sha1= sha1_file($filename);
$sha256 = hash_file("sha256", $filename);
$fsize = filesize($filename);
logDebug("$md5 start processing");
//echo getFileMetadata($filename);
$sampleUpdate = array('hits' => 0, 'completed' => 0, 'is_malware' => 0,
'summary' => '', 'severity' => 0,
'key' => '', 'key_len' => '', 'key_hash' => '', 'key_rol' => '', 'key_not' => '',
'key_tp' => '', 'key_tph' => '', 'key_math' => '', 'key_la' => '', 'key_special' => '',
'key_rank' => '', 'metadata'=> getFileMetadata($filename), 'has_exe' => 0,
'md5' => $md5, 'sha1' => $sha1, 'sha256' => $sha256, 'yara' => array());
$data = file_get_contents($filename);
//check for MS Office xml format:
if (substr($data, 0, 2) == "PK") {
logDebug("$md5 is a PK Zip");
$xmlembedded = analyseDocx($filename);
foreach ($xmlembedded as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
foreach ($summaries as $line) {
if ($line != '')
$sampleUpdate['summary'] .= "$fname.$line\n";
}
$sampleUpdate['completed'] = 1;
}
}
if (isset($sampleUpdate['severity']) && $sampleUpdate['severity'] > 0)
return $sampleUpdate;
}
//check for an embedded PK Zip OpenXML doc header 504B03041400
if (($pk = strpos($data,"\x50\x4B\x03\x04\x14\x00")) > 0) {
file_put_contents($filename.".openxml", substr($data, $pk));
logDebug("has pk inside $pk");
$xmlembedded = analyseDocx($filename.".openxml");
foreach ($xmlembedded as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
foreach ($summaries as $line) {
if ($line != '')
$sampleUpdate['summary'] .= "$fname.$line\n";
}
//$sampleUpdate['completed'] = 1;
}
}
//var_dump($sampleUpdate);
}
$dataa = $data;
$local = 0;
//check for an embedded zlib doc header 0000789c
while (($pk = strpos($dataa,"\x00\x00\x78\x9c")) > 0) {
file_put_contents($filename.".openxml", substr($dataa, $pk));
$local += $pk;
logDebug("has pk inside $pk");
//$dec = @gzinflate(substr($dataa, $pk+12));
$dec = '';
for($i = 4; $i <= 6; $i+=2) {
$dec = @gzinflate(substr($dataa, $pk+$i));
if (strlen($dec) > 0) {
break;
}
}
if (strlen($dec) > 0) {
$l = $local;
$datastored = array();
file_put_contents($filename."-datastore-".$l, $dec);
$dresult = analyseDoc($filename."-datastore-".$l);
if ($dresult['severity'] > 0)
$datastored["datastore-".$l] = $dresult;
else
unlink($filename."-datastore-".$l);
foreach ($datastored as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
foreach ($summaries as $line) {
if ($line != '') {
$sampleUpdate['summary'] .= "$fname";
if ( $xresult['key_rol'] != '' && $xresult['key_rol'] != '0' && !strstr($line, 'rol'))
$line = str_replace(": ", ": rol".$xresult['key_rol'].".", $line);
if ($xresult['key'] != '' && !strstr($line, 'xor'))
$line = str_replace(": ", ": xor_0x".$xresult['key'].".", $line);
$sampleUpdate['summary'] .= ".$line\n";
}
}
$sampleUpdate['completed'] = 1;
}
}
}
$dataa = substr($dataa, $pk+4);
}
unset($dataa);
$dataa = $data;
$local = 0;
//check for an embedded ExOleObjStgCompressedAtom doc header 10001110
while (($pk = strpos($dataa,"\x10\x00\x11\x10")) > 0) {
file_put_contents($filename.".openxml", substr($dataa, $pk));
$local += $pk;
logDebug("has pk inside $pk");
//$dec = @gzinflate(substr($dataa, $pk+12));
$dec = '';
for($i = 10; $i <= 16; $i+=2) {
$dec = @gzinflate(substr($dataa, $pk+$i));
if (strlen($dec) > 0) {
break;
}
}
if (strlen($dec) > 0) {
$l = $local;
$datastored = array();
file_put_contents($filename."-datastore-".$l, $dec);
$dresult = analyseDoc($filename."-datastore-".$l);
if ($dresult['severity'] > 0)
$datastored["datastore-".$l] = $dresult;
else
unlink($filename."-datastore-".$l);
foreach ($datastored as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
foreach ($summaries as $line) {
if ($line != '') {
$sampleUpdate['summary'] .= "$fname";
if ( $xresult['key_rol'] != '' && $xresult['key_rol'] != '0' && !strstr($line, 'rol'))
$line = str_replace(": ", ": rol".$xresult['key_rol'].".", $line);
if ($xresult['key'] != '' && !strstr($line, 'xor'))
$line = str_replace(": ", ": xor_0x".$xresult['key'].".", $line);
$sampleUpdate['summary'] .= ".$line\n";
}
}
$sampleUpdate['completed'] = 1;
}
}
}
$dataa = substr($dataa, $pk+4);
}
unset($dataa);
//check for datastore in RTF
if (stristr(substr($data, 0, 256),'\rt')) {
$d = parseRTF($data);
preg_match_all("/([a-zA-Z0-9\x0a\x0d\x09]*)/s", $d, $match, PREG_OFFSET_CAPTURE);
if (isset($match[1][0])) {
$datastored = array();
foreach($match[1] as $matches0) {
if (isset($matches0[1])) {
$l = $matches0[1];
$len = strlen($matches0[0]);
if ($len > 256) {
file_put_contents($filename."-datastore-".$l, hex2str($matches0[0]));
//echo hex2str($matches0[0]);
$dresult = analyseDoc($filename."-datastore-".$l);
if ($dresult['severity'] > 0)
$datastored["datastore-".$l] = $dresult;
else {
unlink($filename."-datastore-".$l);
file_put_contents($filename."-datastore-".$l, hex2str("0".$matches0[0]));
//echo hex2str($matches0[0]);
$dresult = analyseDoc($filename."-datastore-".$l);
if ($dresult['severity'] > 0)
$datastored["datastore-".$l] = $dresult;
else {
unlink($filename."-datastore-".$l);
}
}
}
}
}
foreach ($datastored as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
foreach ($summaries as $line) {
if ($line != '') {
$sampleUpdate['summary'] .= "$fname";
if ( $xresult['key_rol'] != '' && $xresult['key_rol'] != '0' && !strstr($line, 'rol'))
$line = str_replace(": ", ": rol".$xresult['key_rol'].".", $line);
if ($xresult['key'] != '' && !strstr($line, 'xor'))
$line = str_replace(": ", ": xor_0x".$xresult['key'].".", $line);
$sampleUpdate['summary'] .= ".$line\n";
}
}
$sampleUpdate['completed'] = 1;
}
}
//store datastore xor information
}
}
//check for datastore in Postscript
if (stristr(substr($data, 0, 4),'%!PS')) {
preg_match_all("/([a-zA-Z0-9\x0a\x0d\x20\x09]*)/s", $d, $match, PREG_OFFSET_CAPTURE);
if (isset($match[1][0])) {
$datastored = array();
foreach($match[1] as $matches0) {
if (isset($matches0[1])) {
$l = $matches0[1];
$len = strlen($matches0[0]);
if ($len > 1024) {
file_put_contents($filename."-datastore-".$l, hex2str($matches0[0]));
//echo hex2str($matches0[0]);
$dresult = analyseDoc($filename."-datastore-".$l);
if ($dresult['severity'] > 0)
$datastored["datastore-".$l] = $dresult;
else
unlink($filename."-datastore-".$l);
}
}
}
foreach ($datastored as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
foreach ($summaries as $line) {
if ($line != '') {
$sampleUpdate['summary'] .= "$fname";
if ( $xresult['key_rol'] != '' && $xresult['key_rol'] != '0' && !strstr($line, 'rol'))
$line = str_replace(": ", ": rol".$xresult['key_rol'].".", $line);
if ($xresult['key'] != '' && !strstr($line, 'xor'))
$line = str_replace(": ", ": xor_0x".$xresult['key'].".", $line);
$sampleUpdate['summary'] .= ".$line\n";
}
}
$sampleUpdate['completed'] = 1;
}
}
//store datastore xor information
}
}
//check for data in mime mso xml
if (stristr(substr($data, 0, 256),'xml') || stristr(substr($data, 0, 256),'MIME-Version') ) { preg_match_all("/([a-zA-Z0-9\/+=\x0a\x0d]{1024,})/s", $data, $match, PREG_OFFSET_CAPTURE);
if (isset($match[1][0])) {
$datastored = array();
foreach($match[1] as $matches0) {
if (isset($matches0[1])) {
$l = $matches0[1];
$d64 = "";
if (substr($matches0[0], 0, 3) == "mso")
$d64 = base64_decode(substr($matches0[0], 4), false);
else
$d64 = base64_decode($matches0[0], false);
$len0 = strlen($d64);
if ($len0 > 0) {
if (stristr(substr($d64, 0, 10), 'ActiveMime' )) {
$s64 = $d64;
$d64 = @gzuncompress(substr($s64, 50) );
$len = strlen($d64);
if ($len == 0) {
for ($i=0;$i < strlen($s64); $i++) {
$d64 = @gzuncompress(substr($s64, $i));
$len = strlen($d64);
if ($len > 0) break;
}
}
}
}
$len = strlen($d64);
if ($len > 1024) {
file_put_contents($filename."-datastore-".$l, $d64);
$dresult = analyseDoc($filename."-datastore-".$l);
if ($dresult['severity'] > 0)
$datastored["datastore-".$l] = $dresult;
else
unlink($filename."-datastore-".$l);
}
}
}
foreach ($datastored as $fname => $xresult) {
if ($xresult['severity'] > 0) {
$sampleUpdate['severity'] += $xresult['severity'];
if ($xresult['has_exe'] == 1)
$sampleUpdate['has_exe'] = 1;
if ($xresult['is_malware'] == 1)
$sampleUpdate['is_malware'] = 1;
$summaries = explode("\n", $xresult['summary']);
$sampleUpdate['summary'] .= "embedded.file $fname ".$xresult['md5']."\n";
if (isset($xresult['yara']))
$sampleUpdate['yara'] = array_merge($sampleUpdate['yara'],$xresult['yara']) ;
foreach ($summaries as $line) {
if ($line != '') {
$sampleUpdate['summary'] .= "$fname";
if ( $xresult['key_rol'] != '' && $xresult['key_rol'] != '0' && !strstr($line, 'rol'))
$line = str_replace(": ", ": rol".$xresult['key_rol'].".", $line);
if ($xresult['key'] != '' && !strstr($line, 'xor'))
$line = str_replace(": ", ": xor_0x".$xresult['key'].".", $line);
$sampleUpdate['summary'] .= ".$line\n";
}
}
$sampleUpdate['completed'] = 1;
}
}
//store datastore xor information
}
}
$result = cryptoStat($data);
$exploits = array();
$hits = array();
if (isset($result['exploits'])) {
$exploits = $result['exploits'];
unset($result['exploits']);
}
foreach ($sampleUpdate as $key => $value) {
if ($value != "0" && $value != '')
if (!isset($result[$key]) || $result[$key] == 0 || $result[$key] == 0)
unset($result[$key]);
}
$result = array_merge($sampleUpdate,$result);
$summary = $result['summary'];
$severity = $result['severity'];
$rol = 0;
$not = 0;
$la = 0;
$tp = 0;
$tph = 0;
$math = 0;
$has_exe = $result['has_exe'];
foreach ($exploits as $l => $hit) {
if (isset($hit['exploit']) && $hit['exploit'] != '') {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
if (preg_match("/exploit\./", $hit['hit_desc'], $match))
$severity += 20;
else
$severity += 2;
} else {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
}
if ( $has_exe == 1) { //plaintext
$result['key'] = '';
$result['key_len'] = 0;
$result['key_occ'] = 0;
$result['key_hash'] = '';
$result['key_rank'] = 0;
$result['key_entropy'] = '';
} else if ($result['key'] == "00") {
//echo "<P>key 00 recheck</P>\n";
$xorexp = scanXORByte($data);
$xor = $xorexp['xor'];
//var_dump($xorexp);
unset($xorexp['xor']);
if ($xor != '') {
$result['key'] = $xor;
$result['key_len'] = 1;
$result['key_occ'] = 0;
$result['key_entropy'] = 100.0;
$result['key_zero'] = 1;
foreach ($xorexp as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/\.rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/\.not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/\.xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
} else {
$result['key'] = '';
$result['key_len'] = 0;
$result['key_occ'] = 0;
$result['key_entropy'] = '';
if (count($hits) == 0)
$result['is_malware'] = 0;
}
} else if (isset($result['key_len']) && $result['key_len'] > 0) {
$malware = scanFile($data, $result['key']);
if (count($malware) <= 1) {
foreach ($global_true_keys as $tkey) {
$tkey_count = substr_count($data,hex2bin($tkey));
if ($tkey_count > 1) {
$kl = strlen($tkey) / 2;
$tkey_try = substr($tkey.$tkey,($kl-strpos($data,hex2bin($tkey)) % $kl)*2, $kl*2);
$m2 = scanFile($data, $tkey_try);
if (count($m2) > 1) {
$result['key'] = $tkey_try;
$result['key_len'] = strlen($tkey_try)/2;
$malware = $m2; //import
break;
}
}
}
}
foreach ($malware as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
}
if ($result['key_len'] == 1024 && $has_exe != 1) {
$xorexp = scanXORByte($data);
$xor = $xorexp['xor'];
//var_dump($xorexp);
unset($xorexp['xor']);
if ($xor != '') {
$result['key'] = $xor;
$result['key_len'] = 1;
$result['key_occ'] = 0;
$result['key_entropy'] = 100.0;
$result['key_zero'] = 1;
foreach ($xorexp as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/\.rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/\.not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/\.xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
} else {
$result['key'] = '';
$result['key_hash'] = '';
$result['key_len'] = 0;
$result['key_rank'] = 0;
$result['key_occ'] = 0;
$result['key_entropy'] = '';
if (count($hits) == 0 && $severity < 2) { //Mar 5 2015
$result['is_malware'] = 0;
}
}
}
if ($result['is_malware'] == 1 && $severity == 0)
$severity = 1;
$result['has_exe'] = $has_exe;
//check near the end of file
if ($result['has_exe'] == 0 && isset($result['key_blocks']) && $fsize > 20000 && $global_paranoid == 1) {
//echo "trigger special case for dropped document uses a different key then exe, inverse3\n";
$longest = longestOne($result['key_blocks']);
//var_dump($longest);
//echo "do from ".(($longest['pos']+7)*1024)." for ".(($longest['len']-7)*1024)."\n";
$subres = cryptoStat(substr($data, (($longest['pos']+7)*1024), (($longest['len']-7)*1024) ));
//var_dump($subres);
$submalw = scanFile($data, $subres['key']);
//var_dump($submalw);
foreach ($submalw as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
if ($has_exe == 1) {
$result['key'] = $subres['key'];
$result['key_len'] = $subres['key_len'];
$result['key_occ'] = $subres['key_occ'];
$result['key_rank'] = $subres['key_rank'];
$result['key_entropy'] = $subres['key_entropy'];
$result['h_dispersion'] = $subres['h_dispersion'];
$result['h_distribution'] = $subres['h_distribution'];
if (isset($subres['key_zero']))
$result['key_zero'] = $subres['key_zero'];
$result['key_hash'] = $subres['key_hash'];
$result['is_malware'] = 1;
$result['has_exe'] = 1;
}
}
//start start of entropy area
if ($result['has_exe'] == 0 && isset($result['key_blocks'])&& $fsize > 20000 && $global_paranoid == 1) {
//echo "trigger special case for dropped document uses a different key then exe\n";
//echo $result['key_blocks']."\n";
$check = strpos($result['key_blocks'],'11111111111');
$checkFile = strlen($result['key_blocks']);
$magicSize = number_format(($checkFile - $check) * 0.25 * 1024, 0, '.', '');
if ($magicSize > 64000) $magicSize = 64000;
//echo "looking at ".($check*1024)." bytes+$magicSize\n";
$subres = cryptoStat(substr($data, $check*1024, $magicSize));
//var_dump($subres);
$submalw = scanFile($data, $subres['key']);
//var_dump($submalw);
foreach ($submalw as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
if ($has_exe == 1) {
$result['key'] = $subres['key'];
$result['key_len'] = $subres['key_len'];
$result['key_occ'] = $subres['key_occ'];
$result['key_rank'] = $subres['key_rank'];
$result['key_entropy'] = $subres['key_entropy'];
$result['h_dispersion'] = $subres['h_dispersion'];
$result['h_distribution'] = $subres['h_distribution'];
if (isset($subres['key_zero']))
$result['key_zero'] = $subres['key_zero'];
$result['key_hash'] = $subres['key_hash'];
$result['is_malware'] = 1;
$result['has_exe'] = 1;
}
}
//check end of file
if ($result['has_exe'] == 0 && isset($result['key_blocks']) && $fsize > 20000 && $global_paranoid == 1) {
//echo "trigger special case for dropped document uses a different key then exe, inverse\n";
//echo $result['key_blocks']."\n";
$checkFile = strlen($result['key_blocks']);
$magicSize = number_format($checkFile * 0.14 * 1024, 0, '.', '');
if ($magicSize > 64000) $magicSize = 64000;
//echo "-$magicSize\n";
$subres = cryptoStat(substr($data, -$magicSize));
//var_dump($subres);
$submalw = scanFile($data, $subres['key']);
//var_dump($submalw);
foreach ($submalw as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
if ($has_exe == 1) {
$result['key'] = $subres['key'];
$result['key_len'] = $subres['key_len'];
$result['key_occ'] = $subres['key_occ'];
$result['key_rank'] = $subres['key_rank'];
$result['key_entropy'] = $subres['key_entropy'];
$result['h_dispersion'] = $subres['h_dispersion'];
$result['h_distribution'] = $subres['h_distribution'];
if (isset($subres['key_zero']))
$result['key_zero'] = $subres['key_zero'];
$result['key_hash'] = $subres['key_hash'];
$result['is_malware'] = 1;
$result['has_exe'] = 1;
}
}
//check middle of file
if ($result['has_exe'] == 0 && isset($result['key_blocks'])&& $fsize > 20000 && $global_paranoid == 1) {
//echo "trigger special case for dropped document uses a different key then exe, middle\n";
//echo $result['key_blocks']."\n";
$checkFile = number_format(strlen($result['key_blocks']) / 2 * 1024, 0, '.', ''); ;
$magicSize = $checkFile / 2;
if ($magicSize > 64000) $magicSize = 64000;
//echo "$checkFile -$magicSize\n";
$subres = cryptoStat(substr($data, $checkFile-$magicSize, $magicSize*2));
//var_dump($subres);
$submalw = scanFile($data, $subres['key']);
//var_dump($submalw);
foreach ($submalw as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}
$has_exe = 1;
}
if ($has_exe == 1) {
$result['key'] = $subres['key'];
$result['key_len'] = $subres['key_len'];
$result['key_occ'] = $subres['key_occ'];
$result['key_rank'] = $subres['key_rank'];
$result['key_entropy'] = $subres['key_entropy'];
$result['h_dispersion'] = $subres['h_dispersion'];
$result['h_distribution'] = $subres['h_distribution'];
if (isset($subres['key_zero']))
$result['key_zero'] = $subres['key_zero'];
$result['key_hash'] = $subres['key_hash'];
$result['is_malware'] = 1;
$result['has_exe'] = 1;
}
}
//check near the end of file
if ($result['has_exe'] == 0 && isset($result['key_blocks'])&& $fsize > 20000 && $global_paranoid == 1) {
//echo "trigger special case for dropped document uses a different key then exe, inverse3\n";
//echo $result['key_blocks']."\n";
$checkFile = strlen($result['key_blocks']);
$magicSize = number_format($checkFile * 0.14 * 1024, 0, '.', '');
if ($magicSize > 64000) $magicSize = 64000;
//echo "-$magicSize\n";
//echo (-$magicSize*3)." $magicSize\n";
$subres = cryptoStat(substr($data, -$magicSize*3, $magicSize));
//var_dump($subres);
$submalw = scanFile($data, $subres['key']);
//var_dump($submalw);
foreach ($submalw as $l => $hit) {
$hit['parent_md5'] = $md5;
$hit['parent_sha256'] = $sha256;
$hits[$hit['exploit_loc']] = $hit;
$summary .= $hit['exploit_loc'].": ".$hit['hit_desc']."\n";
$severity += 10;
if (preg_match("/^rol(\d+)/", $hit['hit_desc'], $match))
$rol = $match[1];
if (preg_match("/^not/", $hit['hit_desc'], $match))
$not = 1;
if (preg_match("/^xorla/", $hit['hit_desc'], $match))
$la = 1;
if (preg_match("/transposition cipher/", $hit['hit_desc'], $match)) {
if (preg_match("/This program/", $hit['hit_desc'], $match))
$tph = 1;
else
$tp = 1;
}