AWD比赛中的一些防护思路技巧

AWD比赛中的一些防护思路技巧_第1张图片## 思路1:
1、改服务器密码
(1)linux:passwd
(2)如果是root删除可登录用户:cat /etc/passwd | grep bash userdel -r 用户名
(3)mysql:update mysql.user set password=md5(‘密码’) where user=‘root’;
进入mysql:5.7之后的版本
update user set authentication_string=password(“您要修改的密码”) where user=“root”;
(4)mysql删除匿名空用户:delete from mysql.user where user=’ ';
(5)数据库刷新:flush privileges;
(6)修改网站后台密码:页面,源码,御剑扫描,尝试弱口令进去改管理密码

2、web防护
(1)打包网站目录/var/www/html :tar -cvf xxx.tar 打包对象/*
(2)ssh ftp 将文件拉到本地
①ssh :scp [email protected]:/root/flag.txt /root/
②ftp:#ftp [IP地址] #get [文件名] 或者用ftp登入软件下载
(3)d盾查杀木马文件,删除文件
①:rm -rf 文件
②:echo其为空:html目录下:echo > xx.php 两个空格

3、站点实时守护
(1)查看进程 关闭现有连接的IP
①:who获取pts,pkill -kill -t pts/进程号
(2)http下新增文件 删除:find ./ -cmin -30 rm -rf 或制空 echo
(3)不死马抗衡删除
创建文件:vim killshell.sh
#!/bin/bash
while true
do
rm -rf xxx.php
done
赋予权限 运行:chmod 777 killshell.sh nohup ./killshell.sh &
进程查看:ps -aux | grep killshell.sh
(4)发现存在漏洞页面,考虑制空
echo > xxx.php

ps:
平台可能root密码为toor 或者内核溢出提权4.4.0-31-generic Ubuntu 内核。
chmod 777 payload (可能需要编译)
./payload
root后删除curl ,防止读取文件 rm -rf /bin/curl

攻击思路:
(1)22端口的弱口令攻击
(2)通过已知的木马,编写读取脚本
(3)不死马种植

思路2:

文件备份与监控
部署监控脚本:无python环境使用jiank_kpy2_z
上传文件后:chmod +x jiank_kpy_z
./执行,选择监控位置:/www/wwwroot/xxx
自动备份文件:www/wwwroot
有python环境:python3 py3监控.py

waf脚本:linux
找到网站子目录上传waf 找到index.php文件包含 waf文件
在第二行包含 include ‘waf3_ruoji_1.php’;保存
会在tmp/1log生成日志文件
当攻击者访问带有flag语句 则会执行假的flag输出

ip封禁
当监控到访问数据包
ip_heimd上传到子目录下
并且包含在waf前面
include ‘ip_heimd.php’;
include ‘waf3_ruoji_1.php’;
考虑封多个IP?

python3搅屎:将对方url输入 持续发送垃圾数据包

ip资产收集 py脚本 循环url

指纹识别 离线 目录扫描 御剑 d盾 w13scan

waf监控脚本

实时监测本地文件的缺失增加

# -*- coding: utf-8 -*-
import os
import re
import hashlib
import shutil
import ntpath
import time
import sys

# 设置系统字符集,防止写入log时出现错误
reload(sys)
sys.setdefaultencoding('utf-8')

CWD = raw_input('脚本监控位置:') # 脚本监控位置


CWD_path =raw_input('备份文件位置位置:')# 备份文件路径
FILE_MD5_DICT = {}      # 文件MD5字典
ORIGIN_FILE_LIST = []

# 特殊文件路径字符串
Special_path_str = 'drops_B0503373BDA6E3C5CD4E5118C02ED13A' #drops_md5(icecoke1024)
bakstring = 'back_CA7CB46E9223293531C04586F3448350'          #bak_md5(icecoke1)
logstring = 'log_8998F445923C88FF441813F0F320962C'          #log_md5(icecoke2)
webshellstring = 'webshell_988A15AB87447653EFB4329A90FF45C5'#webshell_md5(icecoke3)
difffile = 'difference_3C95FA5FB01141398896EDAA8D667802'          #diff_md5(icecoke4)

Special_string = 'drops_log'  # 免死金牌
UNICODE_ENCODING = "utf-8"
INVALID_UNICODE_CHAR_FORMAT = r"\?%02x"

# 文件路径字典
spec_base_path = os.path.realpath(os.path.join(CWD_path, Special_path_str))
Special_path = {
    'bak' : os.path.realpath(os.path.join(spec_base_path, bakstring)),
    'log' : os.path.realpath(os.path.join(spec_base_path, logstring)),
    'webshell' : os.path.realpath(os.path.join(spec_base_path, webshellstring)),
    'difffile' : os.path.realpath(os.path.join(spec_base_path, difffile)),
}

def isListLike(value):
    return isinstance(value, (list, tuple, set))

# 获取Unicode编码
def getUnicode(value, encoding=None, noneToNull=False):

    if noneToNull and value is None:
        return NULL

    if isListLike(value):
        value = list(getUnicode(_, encoding, noneToNull) for _ in value)
        return value

    if isinstance(value, unicode):
        return value
    elif isinstance(value, basestring):
        while True:
            try:
                return unicode(value, encoding or UNICODE_ENCODING)
            except UnicodeDecodeError, ex:
                try:
                    return unicode(value, UNICODE_ENCODING)
                except:
                    value = value[:ex.start] + "".join(INVALID_UNICODE_CHAR_FORMAT % ord(_) for _ in value[ex.start:ex.end]) + value[ex.end:]
    else:
        try:
            return unicode(value)
        except UnicodeDecodeError:
            return unicode(str(value), errors="ignore")

# 目录创建
def mkdir_p(path):
    import errno
    try:
        os.makedirs(path)
    except OSError as exc:
        if exc.errno == errno.EEXIST and os.path.isdir(path):
            pass
        else: raise

# 获取当前所有文件路径
def getfilelist(cwd):
    filelist = []
    for root,subdirs, files in os.walk(cwd):
        for filepath in files:
            originalfile = os.path.join(root, filepath)
            if Special_path_str not in originalfile:
                filelist.append(originalfile)
    return filelist

# 计算机文件MD5值
def calcMD5(filepath):
    try:
        with open(filepath,'rb') as f:
            md5obj = hashlib.md5()
            md5obj.update(f.read())
            hash = md5obj.hexdigest()
            return hash
# 文件MD5消失即为文件被删除,恢复文件
    except Exception, e:
        print u'[*] 文件被删除 : ' + getUnicode(filepath)
    shutil.copyfile(os.path.join(Special_path['bak'], ntpath.basename(filepath)), filepath)
    for value in Special_path:
        mkdir_p(Special_path[value])
        ORIGIN_FILE_LIST = getfilelist(CWD)
        FILE_MD5_DICT = getfilemd5dict(ORIGIN_FILE_LIST)
    print u'[+] 被删除文件已恢复!'
    try:
         f = open(os.path.join(Special_path['log'], 'log.txt'), 'a')
         f.write('deleted_file: ' + getUnicode(filepath) + ' 时间: ' + getUnicode(time.ctime()) + '\n')
         f.close()
    except Exception as e:
         print u'[-] 记录失败 : 被删除文件: ' + getUnicode(filepath)
         pass

# 获取所有文件MD5
def getfilemd5dict(filelist = []):
    filemd5dict = {}
    for ori_file in filelist:
        if Special_path_str not in ori_file:
            md5 = calcMD5(os.path.realpath(ori_file))
            if md5:
                filemd5dict[ori_file] = md5
    return filemd5dict

# 备份所有文件
def backup_file(filelist=[]):
    for filepath in filelist:
        if Special_path_str not in filepath:
            shutil.copy2(filepath, Special_path['bak'])

if __name__ == '__main__':
    print u'---------持续监测文件中------------'
    for value in Special_path:
        mkdir_p(Special_path[value])
    # 获取所有文件路径,并获取所有文件的MD5,同时备份所有文件
    ORIGIN_FILE_LIST = getfilelist(CWD)
    FILE_MD5_DICT = getfilemd5dict(ORIGIN_FILE_LIST)
    backup_file(ORIGIN_FILE_LIST) 
    print u'[*] 所有文件已备份完毕!'
    while True:
        file_list = getfilelist(CWD)
        # 移除新上传文件
        diff_file_list = list(set(file_list) ^ set(ORIGIN_FILE_LIST))
        if len(diff_file_list) != 0:
            for filepath in diff_file_list:
                try:
                    f = open(filepath, 'r').read()
                except Exception, e:
                    break
                if Special_string not in f:
                    try:
                        print u'[*] 查杀疑似WebShell上传文件: ' + getUnicode(filepath)
                        shutil.move(filepath, os.path.join(Special_path['webshell'], ntpath.basename(filepath) + '.txt'))
                        print u'[+] 新上传文件已删除!'
                    except Exception as e:
                        print u'[!] 移动文件失败, "%s" 疑似WebShell,请及时处理.'%getUnicode(filepath)
                    try:
                        f = open(os.path.join(Special_path['log'], 'log.txt'), 'a')
                        f.write('new_file: ' + getUnicode(filepath) + ' 时间: ' + str(time.ctime()) + '\n')
                        f.close()
                    except Exception as e:
                        print u'[-] 记录失败 : 上传文件: ' + getUnicode(e)

        # 防止任意文件被修改,还原被修改文件
        md5_dict = getfilemd5dict(ORIGIN_FILE_LIST)
        for filekey in md5_dict:
            if md5_dict[filekey] != FILE_MD5_DICT[filekey]:
                try:
                    f = open(filekey, 'r').read()
                except Exception, e:
                    break
                if Special_string not in f:
                    try:
                        print u'[*] 该文件被修改 : ' + getUnicode(filekey)
                        shutil.move(filekey, os.path.join(Special_path['difffile'], ntpath.basename(filekey) + '.txt'))
                        shutil.copyfile(os.path.join(Special_path['bak'], ntpath.basename(filekey)), filekey)
                        print u'[+] 文件已复原!'
                    except Exception as e:
                        print u'[!] 移动文件失败, "%s" 疑似WebShell,请及时处理.'%getUnicode(filekey)
                    try:
                        f = open(os.path.join(Special_path['log'], 'log.txt'), 'a')
                        f.write('difference_file: ' + getUnicode(filekey) + ' 时间: ' + getUnicode(time.ctime()) + '\n')
                        f.close()
                    except Exception as e:
                        print u'[-] 记录失败 : 被修改文件: ' + getUnicode(filekey)
                        pass
        time.sleep(2)

waf黑名单策略(慎用)

 $value) {
			array_push($tmp,["filename"=>$_FILES[$key]["name"],"contents"=>base64_encode(file_get_contents($_FILES[$key]["tmp_name"]))]);
		}
		$flow = array(
		'Userip'=>$_SERVER['REMOTE_ADDR'],
		'Path' =>'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"],
		'Post'=>$_POST,
		"File"=>$tmp,
		'Cookie'=>$_COOKIE,
		'Time'=> date('Y-m-s h:i:s',time())
		);
	}else{
		$flow = array(
		'Userip'=>$_SERVER['REMOTE_ADDR'],
		'Path' =>'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"],
		'Post'=>$_POST,
		'Cookie'=>$_COOKIE,
		'Time'=> date('Y-m-s h:i:s',time())
		);
	}
	$log_path = $log_file_path;
	$f = fopen($log_path,'a');
	fwrite($f,"\n".json_encode($flow,true));
	fclose($f);
}
/**
 * [banIP IP封禁模块]
 * @return [type] [description]
 */
function banIP(){
	global $blackIp;
	if(is_file('black.txt')){
		$blackIp = array_filter(explode("\n",file_get_contents('black.txt')));
	}
	$userIP = $_SERVER['REMOTE_ADDR'];
	$_not_found = <<


404 Not Found

Not Found

The requested URL / was not found on this server.

END; if(in_array($userIP,$blackIp)){ $staus_code = "HTTP/1.1 404 Not Found"; header($staus_code); die($_not_found); } } access(); banIP(); ?>

日志审计系统

|<.*(data|src)=data:text\\/html.*>|\\b(alert\\(|confirm\\(|expression\\(|prompt\\(|benchmark\s*?\(.*\)|sleep\s*?\(.*\)|\\b(group_)?concat[\\s\\/\\*]*?\\([^\\)]+?\\)|\bcase[\s\/\*]*?when[\s\/\*]*?\([^\)]+?\)|load_file\s*?\\()|<[a-z]+?\\b[^>]*?\\bon([a-z]{4,})\s*?=|^\\+\\/v(8|9)|\\b(and|or)\\b\\s*?([\\(\\)'\"\\d]+?=[\\(\\)'\"\\d]+?|[\\(\\)'\"a-zA-Z]+?=[\\(\\)'\"a-zA-Z]+?|>|<|\s+?[\\w]+?\\s+?\\bin\\b\\s*?\(|\\blike\\b\\s+?[\"'])|\\/\\*.*\\*\\/|<\\s*script\\b|\\bEXEC\\b|UNION.+?SELECT\s*(\(.+\)\s*|@{1,2}.+?\s*|\s+?.+?|(`|'|\").*?(`|'|\")\s*)|UPDATE\s*(\(.+\)\s*|@{1,2}.+?\s*|\s+?.+?|(`|'|\").*?(`|'|\")\s*)SET|INSERT\\s+INTO.+?VALUES|(SELECT|DELETE)@{0,2}(\\(.+\\)|\\s+?.+?\\s+?|(`|'|\").*?(`|'|\"))FROM(\\(.+\\)|\\s+?.+?|(`|'|\").*?(`|'|\"))|(CREATE|ALTER|DROP|TRUNCATE)\\s+(TABLE|DATABASE)|<.*(iframe|frame|style|embed|object|frameset|meta|xml|a|img)|hacker|eval\(.*\)|phpinfo\(\)|assert\(.*\)|\`|\~|\^|<\?php|[oc]:\d+:|pcntl_alarm|pcntl_fork|pcntl_waitpid|pcntl_wait|pcntl_wifexited|pcntl_wifstopped|pcntl_wifsignaled|pcntl_wifcontinued|pcntl_wexitstatus|pcntl_wtermsig|pcntl_wstopsig|pcntl_signal|pcntl_signal_get_handler|pcntl_signal_dispatch|pcntl_get_last_error|pcntl_strerror|pcntl_sigprocmask|pcntl_sigwaitinfo|pcntl_sigtimedwait|pcntl_exec|pcntl_getpriority|pcntl_setpriority|pcntl_async_signals|system\(.*\)|exec\(.*\)|shell_exec\(.*\)|popen\(.*\)|proc_open\(.*\)|passthru\(.*\)|symlink\(.*\)|link\(.*\)|syslog\(.*\)|imap_open\(.*\)|flag|cat\s|etc\spasswd|IFS|display_errors|catch|ini_set|set_time_limit(0)";

function Check_Flux($Value,$ArrFiltReq){
			foreach ($Value as $key => $value) {
				if(!is_array($value)){
					if (preg_match("/".$ArrFiltReq."/is",$value,$m)==1){
						return 1;
					}
				}else{
					if (preg_match("/".$ArrFiltReq."/is",implode($value))==1){
						return 1;
					}
				}
				
			}
			return 0;
		}
function login(){
	echo "

日志审计系统登陆

"; echo "
"; } function jsonIndentFormat($jsonStr) { $result = ''; $indentCount = 0; $strLen = strlen($jsonStr); $indentStr = ' '; $newLine = "\r\n"; $isInQuotes = false; $prevChar = ''; for($i = 0; $i <= $strLen; $i++) { $char = substr($jsonStr, $i, 1); if($isInQuotes){ $result .= $char; if(($char=='"' && $prevChar!='\\')){ $isInQuotes = false; } } else{ if(($char=='"' && $prevChar!='\\')){ $isInQuotes = true; if ($prevChar != ':'){ $result .= $newLine; for($j = 0; $j < $indentCount; $j++) { $result .= $indentStr; } } $result .= $char; } elseif(($char=='{' || $char=='[')){ if ($prevChar != ':'){ $result .= $newLine; for($j = 0; $j < $indentCount; $j++) { $result .= $indentStr; } } $result .= $char; $indentCount = $indentCount + 1; } elseif(($char=='}' || $char==']')){ $indentCount = $indentCount - 1; $result .= $newLine; for($j = 0; $j < $indentCount; $j++) { $result .= $indentStr; } $result .= $char; } else{ $result .= $char; } } $prevChar = $char; } return $result; } function login_check($pass){ $passwd=$GLOBALS['passwd']; if($pass!=$passwd){//此处修改密码 die("Password error!"); }else{ $_SESSION['user']=1; } } ?> 日志

日志审计系统

">
ID 访问IP 数据 时间 类型判断

做一个简单的记录,最近刚比赛完

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