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Overview

HTTP Bypass is a sophisticated Layer 7 attack method designed to mimic legitimate browser traffic and bypass common DDoS protection mechanisms. It generates realistic HTTP requests with randomized paths, query parameters, headers, referrers, and cookies to appear as authentic user traffic.
This attack method is optimized to evade detection by simulating real browser behavior patterns.

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How it works

The HTTP Bypass attack uses advanced evasion techniques:
  1. Path Randomization: Generates random resource-like paths
    • Examples: /abc123.js, /def456/test.css, /xyz789.png
    • Includes common web resource extensions (js, css, png, jpg, svg)
  2. Query Parameter Injection: 50% chance to add cache-busting parameters (?_=random)
  3. Browser Mimicry: Uses DialedMimicHTTPClient for realistic connection patterns
  4. Header Spoofing: Sets browser-like headers via SetMimicHeaders()
  5. Referrer Rotation: 50% chance to include referrer
    • Same-origin referrer (target site’s homepage)
    • Or popular sites (google.com, youtube.com, twitter.com)
  6. Cookie Injection: 50% chance to add tracking cookies (_ga, _gid)
  7. Request Method: 80% GET, 20% POST requests
  8. Content-Type: POST requests use application/x-www-form-urlencoded

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When to use

HTTP Bypass is ideal for:
  • Testing WAF effectiveness: Evaluate if your Web Application Firewall can detect sophisticated attacks
  • CDN bypass testing: Check if CDN protection can distinguish attack traffic from legitimate users
  • Rate limiting validation: Verify if rate limiting applies to “realistic” traffic
  • Bot detection testing: Test anti-bot systems under realistic attack scenarios
  • Resilience against advanced threats: Simulate APT-style low-and-slow attacks
This method is designed to bypass security controls. Only use on systems you own or have explicit authorization to test.

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Usage

Basic HTTP Bypass attack: 
mmb attack http_bypass https://example.com
With custom configuration: 
mmb attack http_bypass https://example.com \
  --duration 180 \
  --delay 300 \
  --packet-size 256 \
  --threads 16 \
  --verbose

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Parameters

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target
string
required
Target URL including protocol (http:// or https://)
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--duration
int
default:"60"
Attack duration in seconds
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--delay
int
default:"500"
Delay between requests in milliseconds per thread
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--packet-size
int
default:"512"
Size of POST body payload. Minimum 256 bytes used if value is lower.
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--threads
int
default:"0"
Number of concurrent threads (0 = number of CPU cores)
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--verbose
boolean
default:"false"
Show detailed logs including headers, paths, and proxy usage
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--no-proxy
boolean
default:"false"
Allow running without proxies (reduces stealth)

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Expected behavior

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Console output

Standard mode: 
Starting http_bypass against https://example.com with 200 proxies
22:10:15 PPS:156 Total:156 Proxies:200
22:10:16 PPS:168 Total:324 Proxies:200
22:10:17 PPS:171 Total:495 Proxies:200
Verbose mode: 
Starting http_bypass against https://example.com with 200 proxies
Verbose mode enabled - showing detailed attack logs
22:10:15 PPS:156 Total:156 Proxies:200 [SOCKS5 stealthproxy.net:1080 -> https://example.com]
22:10:16 PPS:168 Total:324 Proxies:200 [HTTP proxy.service.io:3128 -> https://example.com]

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Request examples

GET request with randomized path and referrer: 
GET /abc123/test.js?_=xy78z456 HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)...
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://www.google.com
Connection: keep-alive
POST request with cookies: 
POST /def456.php HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)...
Content-Type: application/x-www-form-urlencoded
Cookie: _ga=GA1.2.12345678; _gid=GA1.2.87654321
Content-Length: 256

[random 256-byte payload]

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Technical implementation

Implementation details from internal/attacks/http/bypass.go:21-70:
  • Client: Uses DialedMimicHTTPClient with 6-second timeout
  • Path generation: randomPath() creates resource-like URLs
  • Header spoofing: SetMimicHeaders() applies browser fingerprint
  • Randomization: Multiple randomness layers for unpredictability
  • URL manipulation: Preserves existing path while appending random segments
  • Response handling: Discards response bodies to conserve resources

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Evasion techniques breakdown

The attack generates paths that look like real web resources:
  • 33% chance of nested paths (random1/random2.ext)
  • 67% chance of single-level paths (random.ext)
  • Extensions: blank (30%), .js, .css, .png, .jpg, .svg
  • Makes pattern-based blocking difficult
The SetMimicHeaders() function adds:
  • Realistic Accept headers for HTML, CSS, JS, images
  • Accept-Language with locale preferences
  • Accept-Encoding with compression support
  • DNT (Do Not Track) header
  • Browser-specific connection settings
50% of requests include referrers:
  • Same-origin: Points to target’s homepage
  • Cross-origin: Popular sites (Google, YouTube, Twitter)
  • Simulates traffic from search engines and social media

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Best practices

1

Use with realistic delays

Set --delay to 500-1000ms to simulate human browsing patterns.
2

Rotate quality proxies

Use residential or mobile proxies for maximum stealth. Data center IPs are easier to block.
3

Combine with user agents

Configure user_agents.txt with current browser fingerprints for better mimicry.
4

Monitor target responses

Use --verbose to observe if requests are being blocked or rate-limited.

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Detection and mitigation

If you’re defending against HTTP Bypass attacks:
  • Behavioral analysis: Monitor for unusual request patterns even with valid headers
  • Session tracking: Verify cookie consistency across requests
  • JavaScript challenges: Require client-side execution (this attack can’t execute JS)
  • CAPTCHA: Challenge suspicious traffic sources
  • Rate limiting: Apply per-IP and per-session limits
  • TLS fingerprinting: Verify TLS handshake matches claimed browser

HTTP Flood

High-volume HTTP request flood

HTTP Slowloris

Slow connection attack to exhaust resources

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