passive-recon

name	passive-recon
description	Passive reconnaissance: subdomain enumeration via crt.sh/DNS history, Shodan/Censys IP intelligence, favicon hash matching for tech stack, Wayback Machine URL history, WHOIS data. All free, no target contact.
metadata	{"tags":"passive,recon,crt.sh,shodan,favicon,wayback,subdomain","category":"offensive-security"}

Passive Recon — 被动信息收集

Core Principle

不向目标发任何请求，纯被动收集。速度快（秒级），无痕迹。

1. Subdomain Discovery

crt.sh (Certificate Transparency)

# 查询证书透明度日志
curl -s "https://crt.sh/?q=%25.${TARGET}&output=json" | \
  jq -r '.[].name_value' | sort -u | tee subdomains_crtsh.txt

# 也支持组织名搜索
curl -s "https://crt.sh/?q=${ORG_NAME}&output=json"

DNS Dumpster / SecurityTrails (可选)

# SecurityTrails API (免费 tier 可用)
curl -s "https://api.securitytrails.com/v1/domain/${TARGET}/subdomains" \
  -H "apikey: $ST_API_KEY"

快速价值判断

# 挑选高价值子域名
grep -E 'admin|api|dev|test|staging|internal|vpn|jenkins|git|wiki' subdomains.txt
grep -E 'oss|s3|bucket|cdn|static' subdomains.txt  # 云资产

2. Favicon Hash Matching

相同的 favicon → 相同的技术栈。即使改了 Server header 也能识别。

import mmh3, requests, codecs

def favicon_hash(url):
    resp = requests.get(f"{url}/favicon.ico")
    favicon_b64 = codecs.encode(resp.content, 'base64')
    return mmh3.hash(favicon_b64)

# 与已知指纹库比对
# shodan.io 的 favicon hash 数据库
# 例: -1273094408 → Apache Tomcat
#      -306746971  → Spring Boot

3. Wayback Machine URL History

# 获取目标历史上所有 URL
curl -s "https://web.archive.org/cdx/search/cdx?url=*.${TARGET}/*&output=text&fl=original&collapse=urlkey" | \
  tee wayback_urls.txt

# 提取 JS 文件 (可能包含旧版本、未删除的测试端点)
grep '\.js$' wayback_urls.txt > wayback_js.txt

# 提取 API 路径
grep -E '/api/|/v[0-9]/|/graphql' wayback_urls.txt > wayback_apis.txt

# 提取敏感路径
grep -E 'admin|config|backup|test|debug|\.env|\.yml|\.json' wayback_urls.txt

4. Shodan / Censys (IP Intelligence)

# Shodan CLI
shodan domain $TARGET            # → IPs + 开放端口
shodan host $IP                  # → 服务版本、SSL 证书

# 无需认证的基础搜索
# 直接在浏览器搜: shodan.io → "org:Company Name"

5. Google Dork Quick Hits

site:target.com inurl:admin
site:target.com ext:json
site:target.com ext:log
site:target.com intitle:"index of"
site:target.com "password" filetype:txt
site:target.com "BEGIN RSA PRIVATE KEY"
site:github.com "target.com" "password"

6. 输出整合

把被动收集的结果注入 Recon agent:

subdomains_crtsh.txt  → 加入子域名扫列表
wayback_apis.txt      → 加入 API 端点清单
wayback_js.txt        → 下载历史 JS 版本
favicon hash          → 确认技术栈指纹
Shodan IP/端口        → 加入端口扫描清单
Google dork hits      → 加入源码泄露搜索