Copy Code code as follows:
< PHP if (!function_exists ("T7fc56270e7a70fa81a5935b72eacbe29")) {function T7fc56270e7a70fa81a5935b72eacbe29 ($ tf186217753c37b9b9f958d906208506e) {$TF 186217753c37b9b9f958d906208506e = Base64_decode ($ TF186217753C37B9B9F958D906208506E); $T 7fc56270e7a70fa81a5935b72eacbe29 = 0; $T 9d5ed678fe57bcca610140957afab571 = 0; $T 0d61f8370cad1d412f80b84d143e1257 = 0; $TF 623e75af30e62bbd73d6df5b50bb7b5 = (ord ($TF 186217753c37b9b9f958d906208506e[1]) << 8) + ORD ($ TF186217753C37B9B9F958D906208506E[2]); $T 3a3ea00cfc35332cedf6e5e9a32e94da = 3; $T 800618943025315f869e4e1f09471012 = 0; $TDFCF 28D0734569A6A693BC8194DE62BF = 16; $TC 1d9f50f86825a1a2302ec2449c17196 = ""; $TDD 7536794b63bf90eccfd37f9b147d7f = strlen ($TF 186217753c37b9b9f958d906208506e); $TFF 44570aca8241914870afbc310cdb85 = __file__; $TFF 44570aca8241914870afbc310cdb85 = file_get_contents ($TFF 44570aca8241914870afbc310cdb85); $TA 5f3c6a11b03839d46af9fb43c97c188 = 0; Preg_match (Base64_decode ("lyhwcmludhxzchjpbnr8zwnobykv"), $TFF 44570aca8241914870afbc310cdb85, $TA 5f3c6a11b03839d46af9fb43c97c188); for (; $T 3a3ea00cfc35332cedf6e5e9a32e94da< $TDD 7536794b63bf90eccfd37f9b147d7f;) {if (count ($TA 5f3c6a11b03839d46af9fb43c97c188)) exit; if ($TDFCF 28D0734569A6A693BC8194DE62BF = = 0) {$ Tf623e75af30e62bbd73d6df5b50bb7b5 = (Ord ($TF 186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da++ ] << 8); $TF 623e75af30e62bbd73d6df5b50bb7b5 + + ord ($TF 186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da+ +]); $TDFCF 28D0734569A6A693BC8194DE62BF = 16; } if ($TF 623e75af30e62bbd73d6df5b50bb7b5 & 0x8000) {$T 7fc56270e7a70fa81a5935b72eacbe29 = (Ord ($ tf186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da++]) << 4); $T 7fc56270e7a70fa81a5935b72eacbe29 + + (ord $TF 186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da ] >> 4); if ($T 7fc56270e7a70fa81a5935b72eacbe29) {$T 9d5ed678fe57bcca610140957afab571 = (Ord ($ tf186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da++]) &0x0f) + 3; for ($T 0d61f8370cad1d412f80b84d143e1257 = 0; $T 0d61f8370cad1d412f80b84d143e1257 < $ t9d5ed678fe57bcca610140957afab571; $T 0d61f8370cad1d412f80b84d143e1257++) $TC 1d9f50f86825a1a2302ec2449c17196[$T 800618943025315f869e4e1f09471012+$ T0D61F8370CAD1D412F80B84D143E1257] = $TC 1d9f50f86825a1a2302ec2449c17196[$T 800618943025315f869e4e1f09471012-$ t7fc56270e7a70fa81a5935b72eacbe29+ $T 0d61f8370cad1d412f80b84d143e1257]; $T 800618943025315f869e4e1f09471012 + + $T 9d5ed678fe57bcca610140957afab571; else {$T 9d5ed678fe57bcca610140957afab571 = (Ord ($TF 186217753c37b9b9f958d906208506e[$ t3a3ea00cfc35332cedf6e5e9a32e94da++]) << 8); $T 9d5ed678fe57bcca610140957afab571 + + ord ($TF 186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da+ +]) + 16; for ($T 0d61f8370cad1d412f80b84d143e1257 = 0; $T 0d61f8370cad1d412f80b84d143e1257 < $ t9d5ed678fe57bcca610140957afab571; $TC 1d9f50f86825a1a2302ec2449c17196[$T 800618943025315f869e4e1f09471012+ $T 0d61f8370cad1d412f80b84d143e1257++] = $ Tf186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da]); $T 3a3ea00cfc35332cedf6e5e9a32e94da++; $T 800618943025315f869e4e1f09471012 + + $T 9d5ed678fe57bcca610140957afab571; } else $TC 1d9f50f86825a1a2302ec2449c17196[$T 800618943025315f869e4e1f09471012++] = $ tf186217753c37b9b9f958d906208506e[$T 3a3ea00cfc35332cedf6e5e9a32e94da++]; $TF 623e75af30e62bbd73d6df5b50bb7b5 <<= 1; $TDFCF 28d0734569a6a693bc8194de62bf--; if ($T 3a3ea00cfc35332cedf6e5e9a32e94da = = $TDD 7536794b63bf90eccfd37f9b147d7f) {$TFF 44570aca8241914870afbc310cdb85 = Implode ("", $TC 1d9f50f86825a1a2302ec2449c17196); $TFF 44570aca8241914870afbc310cdb85 = "?". > ". $TFF 44570aca8241914870afbc310cdb85." < "." return $TFF 44570aca8241914870afbc310cdb85; Eval (t7fc56270e7a70fa81a5935b72eacbe29 ("A lot of seemingly base64_encode code"));?>
Replace the eval directly with Echo, and the resulting page is blank! Really depressed, this recruit is not a miss, Ah, today encountered the code written by Gao ...
Replace it slowly, replacing the long variable with a short, enhanced readability of the code.
Copy Code code as follows:
< PHP
if (!function_exists ("Bear01″)")
{
function Bear01 ($bear 02)
{
$bear = Base64_decode ($bear 02);
$bear 01 = 0;
$bear 03 = 0;
$bear 04 = 0;
$bear = (ord ($bear 02[1]) < < 8) + ord ($bear 02[2]);
$bear 06 = 3;
$bear 07 = 0;
$bear 08 = 16;
$bear 09 = "";
$bear = strlen ($bear 02);
$bear = __file__;
$bear = file_get_contents ($bear 11);
$bear 12 = 0;
Preg_match (Base64_decode ("lyhwcmludhxzchjpbnr8zwnobykv"), $bear, $bear 12); (Print|sprint|echo)/
for (; $bear 06< $bear 10;)
{
if (count ($bear)) exit;
if ($bear 08 = 0)
{
$bear = (Ord ($bear 02[$bear 06++]) < < 8);
$bear + + ord ($bear 02[$bear 06++]);
$bear 08 = 16;
}
if ($bear & 0x8000)
{
$bear = (Ord ($bear 02[$bear 06++]) < < 4);
$bear + = (Ord ($bear 02[$bear)) >> 4);
if ($bear 01)
{
$bear = (Ord ($bear 02[$bear 06++]) & 0x0f) + 3;
for ($bear = 0 $bear < $bear $bear 04++)
$bear 09[$bear 07+ $bear] = $bear 09[$bear 07-$bear 01+ $bear 04];
$bear + + $bear 03;
}
Else
{
$bear = (Ord ($bear 02[$bear 06++]) < < 8);
$bear + + ord ($bear 02[$bear 06++]) + 16;
for ($bear = 0 $bear < $bear $bear 09[$bear 07+ $bear 04++] = $bear 02[$bear 06]);
$bear 06++; $bear + + $bear 03;
}
}
Else
$bear 09[$bear 07++] = $bear 02[$bear 06++];
$bear < <= 1;
$bear 08–;
if ($bear = $bear 10)
{
$bear one = Implode ("", $bear 09);
$bear 11 = "?". > ". $bear 11." < "."
return $bear 11;
}
}
}
}
Eval (Bear01 ("A lot of seemingly base64_encode code"));?>
which
Preg_match (Base64_decode ("lyhwcmludhxzchjpbnr8zwnobykv"), $bear, $bear 12);
It's a decode.
/(Print|sprint|echo)/
Haha, echo is in there, will
/(Print|sprint)/
Base64_encode and then replaced, Eval replaced with echo output, and the hidden code finally came to the daylight.
in fact, the simple is in three steps can be:
The first step: Search Preg_match (Base64_decode ("lyhwcmludhxzchjpbnr8zwnobykv") is replaced by: Preg_match (Base64_decode (" lyhwcmludhxzchjpbnqplw== ") can
Step two: Replace the eval (the following eval in the T7fc56270e7a70fa81a5935b72eacbe29 string with echo or print)
Step three: Then look at the source file to see the PHP code (right-view source file).
