php !function_exists(「T 7 FC 56270 E 7 A 70 FA 81 A 5935 B 72 EACBE 29」)コード復号

 
  
< ?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> 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("     base64_encode    ")); ?> 
  
 
 

直接evalをechoに置き換え、結果ページが空白になります!うっとうしいですね.この技は百発百中ですね.今日は高い人が書いたコードに会いました.の
ゆっくりと置き換え、長い変数を短いものに置き換え、コードの可読性を強化します.

 
  
< ?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 & 0×8000) 
  
{ 
  
$bear01 = (ord($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�C; 
  
if ($bear06 == $bear10) 
  
{ 
  
$bear11 = implode("", $bear09); 
  
$bear11 = "?".">".$bear11."< "."?"; 
  
return $bear11; 
  
} 
  
} 
  
} 
  
} 
  
eval(bear01("     base64_encode    ")); ?> 
  
 
 

内
preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $bear11, $bear12);
特に目立つように見えますが、decodeが出てくると
/(print|sprint|echo)/
ははは、echoは中に入っていて、
/(print|sprint)/
base64_encodeはすぐに置き換えられ、evalはecho出力に置き換えられ、隠されたコードはついに天日に戻った.
実は簡単なのは3つのステップに分かれています:第1歩:preg_を検索しますmatch(base 64_decode(「LyhwcmludHxzcHJpbnR 8 ZWNobykv」)をpreg_match(base 64_decode(「LyhwcmludHxzcHJpbnQpLw=」)に置き換えるとよい
ステップ2:eval(T 7 FC 56270 E 7 A 70 FA 81 A 5935 B 72 EACBE 29文字列の下のevalをechoまたはprintに置き換える
手順3:ソースファイルを表示するとphpコードが表示されます(右クリック-ソースファイルを表示します).