ubuntu+nginx
飞信API发布12月26
00:26 
今天一位朋友在我的《Base64在线编码解码》上留言说解出来的是乱码，于是我帮他分析了下。
直接将eval替换成echo,结果页面为空白！真郁闷，这招可是百发百中的啊，今天遇到了高人写的代码。。。
慢慢替换，将长变量替换成短的，增强代码可读性。
其中
显得格外扎眼 ，decode出来就是
哈哈，echo就在里面，将
base64_encode一下然后替换，eval替换成echo输出，被隐藏的代码终于重见天日。
<?php if (!function_exists("T7FC56270E7A70FA81A5935B72EACBE29")) { function T7FC56270E7A70FA81A5935B72EACBE29($TF186217753C37B9B9F958D906208506E) { $TF186217753C37B9B9F958D906208506E = base64_decode($TF186217753C37B9B9F958D906208506E); $T7FC56270E7A70FA81A5935B72EACBE29 = 0; $T9D5ED678FE57BCCA610140957AFAB571 = 0; $T0D61F8370CAD1D412F80B84D143E1257 = 0; $TF623E75AF30E62BBD73D6DF5B50BB7B5 = (ord($TF186217753C37B9B9F958D906208506E[1]) << 8) + ord($TF186217753C37B9B9F958D906208506E[2]); $T3A3EA00CFC35332CEDF6E5E9A32E94DA = 3; $T800618943025315F869E4E1F09471012 = 0; $TDFCF28D0734569A6A693BC8194DE62BF = 16; $TC1D9F50F86825A1A2302EC2449C17196 = ""; $TDD7536794B63BF90ECCFD37F9B147D7F = strlen($TF186217753C37B9B9F958D906208506E); $TFF44570ACA8241914870AFBC310CDB85 = __FILE__; $TFF44570ACA8241914870AFBC310CDB85 = file_get_contents($TFF44570ACA8241914870AFBC310CDB85); $TA5F3C6A11B03839D46AF9FB43C97C188 = 0; preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $TFF44570ACA8241914870AFBC310CDB85, $TA5F3C6A11B03839D46AF9FB43C97C188); for (;$T3A3EA00CFC35332CEDF6E5E9A32E94DA<$TDD7536794B63BF90ECCFD37F9B147D7F;) { if (count($TA5F3C6A11B03839D46AF9FB43C97C188)) exit; if ($TDFCF28D0734569A6A693BC8194DE62BF == 0) { $TF623E75AF30E62BBD73D6DF5B50BB7B5 = (ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]) << 8); $TF623E75AF30E62BBD73D6DF5B50BB7B5 += ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]); $TDFCF28D0734569A6A693BC8194DE62BF = 16; } if ($TF623E75AF30E62BBD73D6DF5B50BB7B5 & 0x8000) { $T7FC56270E7A70FA81A5935B72EACBE29 = (ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]) << 4); $T7FC56270E7A70FA81A5935B72EACBE29 += (ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA]) >> 4); if ($T7FC56270E7A70FA81A5935B72EACBE29) { $T9D5ED678FE57BCCA610140957AFAB571 = (ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]) & 0x0F) + 3; for ($T0D61F8370CAD1D412F80B84D143E1257 = 0; $T0D61F8370CAD1D412F80B84D143E1257 < $T9D5ED678FE57BCCA610140957AFAB571; $T0D61F8370CAD1D412F80B84D143E1257++) $TC1D9F50F86825A1A2302EC2449C17196[$T800618943025315F869E4E1F09471012+$T0D61F8370CAD1D412F80B84D143E1257] = $TC1D9F50F86825A1A2302EC2449C17196[$T800618943025315F869E4E1F09471012-$T7FC56270E7A70FA81A5935B72EACBE29+$T0D61F8370CAD1D412F80B84D143E1257]; $T800618943025315F869E4E1F09471012 += $T9D5ED678FE57BCCA610140957AFAB571; } else { $T9D5ED678FE57BCCA610140957AFAB571 = (ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]) << 8); $T9D5ED678FE57BCCA610140957AFAB571 += ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]) + 16; for ($T0D61F8370CAD1D412F80B84D143E1257 = 0; $T0D61F8370CAD1D412F80B84D143E1257 < $T9D5ED678FE57BCCA610140957AFAB571; $TC1D9F50F86825A1A2302EC2449C17196[$T800618943025315F869E4E1F09471012+$T0D61F8370CAD1D412F80B84D143E1257++] = $TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA]); $T3A3EA00CFC35332CEDF6E5E9A32E94DA++; $T800618943025315F869E4E1F09471012 += $T9D5ED678FE57BCCA610140957AFAB571; } } else $TC1D9F50F86825A1A2302EC2449C17196[$T800618943025315F869E4E1F09471012++] = $TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]; $TF623E75AF30E62BBD73D6DF5B50BB7B5 <<= 1; $TDFCF28D0734569A6A693BC8194DE62BF--; if ($T3A3EA00CFC35332CEDF6E5E9A32E94DA == $TDD7536794B63BF90ECCFD37F9B147D7F) { $TFF44570ACA8241914870AFBC310CDB85 = implode("", $TC1D9F50F86825A1A2302EC2449C17196); $TFF44570ACA8241914870AFBC310CDB85 = "?".">".$TFF44570ACA8241914870AFBC310CDB85."<"."?"; return $TFF44570ACA8241914870AFBC310CDB85; } } } } eval(T7FC56270E7A70FA81A5935B72EACBE29("一大堆貌似base64_encode后的代码")); ?>
直接将eval替换成echo,结果页面为空白！真郁闷，这招可是百发百中的啊，今天遇到了高人写的代码。。。
慢慢替换，将长变量替换成短的，增强代码可读性。
<?php
if (!function_exists("bear01"))
{
function bear01($bear02)
{
$bear02 = base64_decode($bear02);
$bear01 = 0;
$bear03 = 0;
$bear04 = 0;
$bear05 = (ord($bear02[1]) << 8) + ord($bear02[2]);
$bear06 = 3;
$bear07 = 0;
$bear08 = 16;
$bear09 = "";
$bear10 = strlen($bear02);
$bear11 = __FILE__;
$bear11 = file_get_contents($bear11);
$bear12 = 0;
preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $bear11, $bear12); ///(print|sprint|echo)/
for (;$bear06<$bear10;)
{
if (count($bear12)) exit;
if ($bear08 == 0)
{
$bear05 = (ord($bear02[$bear06++]) << 8);
$bear05 += ord($bear02[$bear06++]);
$bear08 = 16;
}
if ($bear05 & 0x8000)
{
$bear01 = (ord($bear02[$bear06++]) << 4);
$bear01 += (ord($bear02[$bear06]) >> 4);
if ($bear01)
{
$bear03 = (ord($bear02[$bear06++]) & 0x0F) + 3;
for ($bear04 = 0; $bear04 < $bear03; $bear04++)
$bear09[$bear07+$bear04] = $bear09[$bear07-$bear01+$bear04];
$bear07 += $bear03;
}
else
{
$bear03 = (ord($bear02[$bear06++]) << 8);
$bear03 += ord($bear02[$bear06++]) + 16;
for ($bear04 = 0; $bear04 < $bear03; $bear09[$bear07+$bear04++] = $bear02[$bear06]);
$bear06++; $bear07 += $bear03;
}
}
else
$bear09[$bear07++] = $bear02[$bear06++];
$bear05 <<= 1;
$bear08--;
if ($bear06 == $bear10)
{
$bear11 = implode("", $bear09);
$bear11 = "?".">".$bear11."<"."?";
return $bear11;
}
}
}
}
eval(bear01("一大堆貌似base64_encode后的代码")); ?>
if (!function_exists("bear01"))
{
function bear01($bear02)
{
$bear02 = base64_decode($bear02);
$bear01 = 0;
$bear03 = 0;
$bear04 = 0;
$bear05 = (ord($bear02[1]) << 8) + ord($bear02[2]);
$bear06 = 3;
$bear07 = 0;
$bear08 = 16;
$bear09 = "";
$bear10 = strlen($bear02);
$bear11 = __FILE__;
$bear11 = file_get_contents($bear11);
$bear12 = 0;
preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $bear11, $bear12); ///(print|sprint|echo)/
for (;$bear06<$bear10;)
{
if (count($bear12)) exit;
if ($bear08 == 0)
{
$bear05 = (ord($bear02[$bear06++]) << 8);
$bear05 += ord($bear02[$bear06++]);
$bear08 = 16;
}
if ($bear05 & 0x8000)
{
$bear01 = (ord($bear02[$bear06++]) << 4);
$bear01 += (ord($bear02[$bear06]) >> 4);
if ($bear01)
{
$bear03 = (ord($bear02[$bear06++]) & 0x0F) + 3;
for ($bear04 = 0; $bear04 < $bear03; $bear04++)
$bear09[$bear07+$bear04] = $bear09[$bear07-$bear01+$bear04];
$bear07 += $bear03;
}
else
{
$bear03 = (ord($bear02[$bear06++]) << 8);
$bear03 += ord($bear02[$bear06++]) + 16;
for ($bear04 = 0; $bear04 < $bear03; $bear09[$bear07+$bear04++] = $bear02[$bear06]);
$bear06++; $bear07 += $bear03;
}
}
else
$bear09[$bear07++] = $bear02[$bear06++];
$bear05 <<= 1;
$bear08--;
if ($bear06 == $bear10)
{
$bear11 = implode("", $bear09);
$bear11 = "?".">".$bear11."<"."?";
return $bear11;
}
}
}
}
eval(bear01("一大堆貌似base64_encode后的代码")); ?>
其中
preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $bear11, $bear12);
显得格外扎眼 ，decode出来就是
/(print|sprint|echo)/
哈哈，echo就在里面，将
/(print|sprint)/
base64_encode一下然后替换，eval替换成echo输出，被隐藏的代码终于重见天日。
countmeon 
02/03/2010 16:43
哈哈，解出来啦，不错学习啦。原来echo就是PHP直接输出，当时没转过来。
Bear 回复于 02/04/2010 03:33
呵呵,欢迎下次光临！
countmeon
01/28/2010 15:28
按照步骤试了下，似乎不行的说啊。是不是版本更新了的说。
Bear 回复于 02/03/2010 02:25
请将文件发给我看看，应该没什么问题的
不错
01/26/2010 13:50
Bear 回复于 01/28/2010 13:47
分页： 1/1 
1 
1
