功能

• 统计Top 20 地址
• SQL注入分析
• 扫描器告警分析
• 漏洞利用检测
• 敏感路径访问
• 文件包含攻击
• Webshell
• 寻找响应长度的url Top 20
• 寻找罕见的脚本文件访问
• 寻找302跳转的脚本文件

  Usage

  设置报告保存地址 outfile
  设置日志分析目录 access_dir
  设置日志名称 access_log
  ./nginx_check.sh

  代码

  ```cpp

  !/usr/bin/env bash

echo “” echo “ ========================================================= “ echo “ \ Nginx日志安全分析脚本 V1.0 / “ echo “ ========================================================= “ echo “ # 支持Nginx日志分析，攻击告警分析等 “ echo “ # author：al0ne “ echo “ # https://github.com/al0ne “ echo -e “\n”

此脚本是参考nmgxy/klionsec修改而来,重新添加了一些特征，只用来临时救急，还是推荐到ELK或者Splunk中分析

功能

统计Top 20 地址

SQL注入分析

SQL注入 FROM查询统计

扫描器/常用黑客工具

漏洞利用检测

敏感路径访问

文件包含攻击

HTTP Tunnel

Webshell

寻找响应长度的url Top 20

寻找罕见的脚本文件访问

寻找302跳转的脚本文件

如果存在多个access文件或者有多个access.x.gz 建议先zcat access*.gz >> access.log文件中

设置分析结果存储目录,结尾不能加/

outfile=/tmp/logs

如果目录以存在则清空，未存在则新建目录

if [ -d $outfile ]; then rm -rf $outfile/* else mkdir -p $outfile fi

设置nginx日志目录，结尾必须加/

access_dir=/var/log/nginx/

设置文件名，如果文件名为access那么匹配的是access*文件

access_log=access

判断日志文件是否存在

num=$(ls ${access_dir}${access_log}* | wc -l) >/dev/null 2>&1 if [ $num -eq 0 ]; then echo ‘日志文件不存在’ exit 1 fi echo -e “\n”

验证操作系统是debian系还是centos

OS=’None’ if [ -e “/etc/os-release” ]; then source /etc/os-release case ${ID} in “debian” | “ubuntu” | “devuan”) OS=’Debian’ ;; “centos” | “rhel fedora” | “rhel”) OS=’Centos’ ;; *) ;; esac fi

if [ $OS = ‘None’ ]; then if command -v apt-get >/dev/null 2>&1; then OS=’Debian’ elif command -v yum >/dev/null 2>&1; then OS=’Centos’ else echo -e “\n不支持这个系统\n” echo -e “已退出” exit 1 fi fi

检测ag软件有没有安装

if ag -V >/dev/null 2>&1; then echo -e “\e[00;32msilversearcher-ag已安装 \e[00m” else if [ $OS = ‘Centos’ ]; then yum -y install the_silver_searcher >/dev/null 2>&1 else apt-get -y install silversearcher-ag >/dev/null 2>&1 fi

fi

如果检测别的日志请手动替换偏移，例如awk的$7代表url，$9代表状态码，$10代表长度,本脚本是以nginx日志为基础

echo “分析结果日志：${outfile}” echo “Nginx日志目录：${access_dir}” echo “Nginx文件名：${access_log}” echo -e “\n”

echo -e “\e[00;31m[+]TOP 20 IP 地址\e[00m” ag -a -o —nofilename ‘((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})(.((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})){3}’ ${access_dir}${access_log}* | sort | uniq -c | sort -nr | head -n 20 | tee -a ${outfile}/top20.log echo -e “\n”

echo -e “\e[00;31m[+]SQL注入攻击分析\e[00m”

在SQL注入中排除掉了一些扫描css/js/png图片类等无用告警，并且重点筛选状态码200或者500的告警

ag -a “xp_cmdshell|%20xor|%20and|%20AND|%20or|%20OR|select%20|%20and%201=1|%20and%201=2|%20from|%27exec|information_schema.tables|load_file|benchmark|substring|table_name|table_schema|%20where%20|%20union%20|%20UNION%20|concat(|concat_ws(|%20group%20|0x5f|0x7e|0x7c|0x27|%20limit|\bcurrent_user\b|%20LIMIT|version%28|version(|database%28|database(|user%28|user(|%20extractvalue|%updatexml|rand(0)*2|%20group%20by%20x|%20NULL%2C|sqlmap” ${access_dir}${access_log}* | ag -v ‘/\w+.(?:js|css|html|jpg|jpeg|png|htm|swf)(?:\?| )’ | awk ‘($9==200)||($9==500) {print $0}’ >${outfile}/sql.log awk ‘{print “SQL注入攻击” NR”次”}’ ${outfile}/sql.log | tail -n1 echo “SQL注入 TOP 20 IP地址” ag -o ‘(?<=:)((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})(.((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})){3}’ ${outfile}/sql.log | sort | uniq -c | sort -nr | head -n 20 | tee -a ${outfile}/sql_top20.log

重点关注from查询，是否存在脱裤行为，排除扫描行为

echo “SQL注入 FROM 查询” cat ${outfile}/sql.log | ag ‘\bfrom\b’ | ag -v ‘information_schema’ >${outfile}/sql_from_query.log awk ‘{print “SQL注入FROM查询” NR”次”}’ ${outfile}/sql_from_query.log | tail -n1 echo -e “\n”

echo -e “\e[00;31m[+]扫描器scan & 黑客工具\e[00m” ag -a “acunetix|by_wvs|nikto|netsparker|HP404|nsfocus|WebCruiser|owasp|nmap|nessus|HEAD /|AppScan|burpsuite|w3af|ZAP|openVAS|.+avij|.+angolin|360webscan|webscan|XSS@HERE|XSS%40HERE|NOSEC.JSky|wwwscan|wscan|antSword|WebVulnScan|WebInspect|ltx71|masscan|python-requests|Python-urllib|WinHttpRequest” ${access_dir}${access_log}* | ag -v ‘/\w+.(?:js|css|jpg|jpeg|png|swf)(?:\?| )’ | awk ‘($9==200)||($9==500) {print $0}’ >${outfile}/scan.log awk ‘{print “共检测到扫描攻击” NR”次”}’ ${outfile}/scan.log | tail -n1 echo “扫描工具流量 TOP 20” ag -o ‘(?<=:)\d+.\d+.\d+.\d+’ ${outfile}/scan.log | sort | uniq -c | sort -nr | head -n 20 | tee -a ${outfile}/scan_top20.log echo -e “\n”

echo -e “\e[00;31m[+]敏感路径访问\e[00m” ag -a “/_cat/|/_config/|include=|phpinfo|info.php|/web-console|JMXInvokerServlet|/manager/html|axis2-admin|axis2-web|phpMyAdmin|phpmyadmin|/admin-console|/jmx-console|/console/|.tar.gz|.tar|.tar.xz|.xz|.zip|.rar|.mdb|.inc|.sql|/.config\b|.bak|/.svn/|/.git/|.hg|.DS_Store|.htaccess|nginx.conf|.bash_history|/CVS/|.bak|wwwroot|备份|/Web.config|/web.config|/1.txt|/test.txt” ${access_dir}${access_log}* | awk ‘($9==200)||($9==500) {print $0}’ >${outfile}/dir.log awk ‘{print “共检测到针对敏感文件扫描” NR”次”}’ ${outfile}/dir.log | tail -n1 echo “敏感文件访问流量 TOP 20” ag -o ‘(?<=:)\d+.\d+.\d+.\d+’ ${outfile}/dir.log | sort | uniq -c | sort -nr | head -n 20 | tee -a ${outfile}/dir_top20.log echo -e “\n”

echo -e “\e[00;31m[+]漏洞利用检测\e[00m” ag -a “%00|/win.ini|/my.ini|../../|/etc/shadow|%0D%0A|file:/|gopher:/|dict:/|WindowsPowerShell|/wls-wsat/|call_user_func_array|uddiexplorer|@DEFAULT_MEMBER_ACCESS|@java.lang.Runtime|OgnlContext|/bin/bash|cmd.exe|wget\s|curl\s|s=/index/\think” ${access_dir}${access_log}* | awk ‘($9==200)||($9==500) {print $0}’ >${outfile}/exploit.log awk ‘{print “漏洞利用探测” NR”次”}’ ${outfile}/exploit.log | tail -n1 echo “漏洞利用检测 TOP 20” ag -o ‘(?<=:)\d+.\d+.\d+.\d+’ ${outfile}/exploit.log | sort | uniq -c | sort -nr | head -n 20 | tee -a ${outfile}/exploit_top20.log echo -e “\n”

echo -e “\e[00;31m[+]webshell\e[00m” ag -a “=whoami|dbname=|exec=|cmd=|\br57\b|\bc99\b|\bc100\b|\bb374k\b|adminer.php|eval(|assert(|%eval|%execute|tunnel.[asp|php|jsp|aspx]{3,4}|makewebtaski|ma.[asp|php|jsp|aspx]{3,4}|\bup.[asp|php|jsp|aspx]{3,4}|cmd.[asp|php|jsp|aspx]{3,4}|201\d.[asp|php|jsp|aspx]{3,4}|xiaoma.[asp|php|jsp|aspx]{3,4}|shell.[asp|php|jsp|aspx]{3,4}|404.[asp|php|jsp|aspx]{3,4}|tom.[asp|php|jsp|aspx]{3,4}|k8cmd.[asp|php|jsp|aspx]{3,4}|ver[0-9]{3,4}.[asp|php|jsp|aspx]{3,4}|.aar|[asp|php|jsp|aspx]{3,4}spy.|o=vLogin|aioshell|admine|ghost.[asp|php|jsp|aspx]{3,4}|r00ts|90sec|t00ls|editor.aspx|wso.[asp|aspx]{3,4}” ${access_dir}${access_log}* | awk ‘($9==200)||($9==500) {print $0}’ >${outfile}/webshell.log awk ‘{print “共检测到webshell行为” NR “次”}’ ${outfile}/webshell.log | tail -n1 echo “Webshell TOP 20” ag -o ‘(?<=:)\d+.\d+.\d+.\d+’ ${outfile}/webshell.log | sort | uniq -c | sort -nr | head -n 20 | tee -a ${outfile}/webshell_top20.log echo -e “\n”

echo -e “\e[00;31m[+]HTTP Tunnel\e[00m”

Regeorg代理特征

ag -a “cmd=disconnect|cmd=read|cmd=forward|cmd=connect|127.0.0.1” ${access_dir}${access_log}* | awk ‘($9==200)||($9==500) {print $0}’ | tee -a ${outfile}/tunnel.log awk ‘{print “共检测到隧道行为” NR “次”}’ ${outfile}/tunnel.log | tail -n1 echo -e “\n”

echo -e “\e[00;31m[+]Top 20 url响应长度\e[00m”

查找url响应长度最长的url排序，目的是有没有下载服务器的一些打包文件

len=$(cat ${access_dir}${access_log} | awk ‘{print $10}’ | sort -nr | head -n 20) echo $len | awk ‘BEGIN{ RS=” “ }{ print $0 }’ | xargs -i{} ag -a —nocolor ‘\d+\s{}\s’ ${access_dir}${access_log} | awk ‘{print $7,$10}’ | sort | uniq | sort -k 2 -nr | tee -a ${outfile}/url_rsp_len.log echo -e “\n”

echo -e “\e[00;31m[+]罕见的脚本文件访问\e[00m” echo “访问量特别特别少的脚本文件极有可能是webshell” cat ${access_dir}${access_log}* | awk ‘($9==200)||($9==500) {print $7}’ | sort | uniq -c | sort -n | ag -v ‘\?’ | ag ‘.php|.jsp|.asp|.aspx’ | head -n 20 | tee -a ${outfile}/rare_url.log echo -e “\n”

echo -e “\e[00;31m[+]302跳转\e[00m” echo “此目的是寻找一些登录成功的脚本文件” cat ${access_dir}${access_log}* | awk ‘($9==302)||($9==301) {print $7}’ | sort | uniq -c | sort -n | ag -v ‘\?’ | ag ‘.php|.jsp|.asp|.aspx’ | head -n 20 | tee -a ${outfile}/302_goto.log echo -e “\n” ```