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Introduction:
Archive.org’s Wayback Machine preserves billions of web pages, but it also inadvertently stores sensitive data like email addresses and phone numbers that were once publicly visible. Kronikier, a free web app created by Dmitry Danilov, automates the discovery of such exposed information on a specific domain by querying archived snapshots. This article dissects the tool’s OSINT capabilities, provides manual command-line alternatives for Linux and Windows, and offers defensive strategies to scrub historical leaks from the internet archive.
Learning Objectives:
– Understand how Kronikier leverages Archive.org’s CDX API to locate email addresses and phone numbers tied to a target domain.
– Execute manual OSINT techniques using `curl`, `jq`, `grep`, and PowerShell to extract leaked contact data from archived pages.
– Implement mitigation measures, including removal requests to Archive.org and hardening web applications against future data exposure.
You Should Know:
1. Understanding Kronikier and Archive.org OSINT
Kronikier is a lightweight web app that queries Archive.org’s index for a given domain, retrieves saved page versions (Memento snapshots), and scans their HTML content for email patterns (e.g., `[email protected]`) and phone number formats (e.g., `+1-555-123-4567`). The tool is useful for penetration testers, incident responders, and individuals checking their own digital footprint.
How it works:
1. User inputs a domain (e.g., `example.com`).
2. Kronikier calls `https://web.archive.org/cdx/search/cdx?url=example.com/&output=json` to fetch all archived URLs and timestamps.
3. For each snapshot, it fetches the saved HTML and applies regex patterns.
4. Results display unique emails/phones with the archived page URL.
Step‑by‑step manual equivalent (Linux):
Fetch CDX data for a domain
curl -s "https://web.archive.org/cdx/search/cdx?url=example.com/&output=json" | jq '.[] | .[bash]' > urls.txt
Download a specific archived page (use timestamp and original URL)
wget "https://web.archive.org/web/20241001000000/https://example.com/contact.html"
Extract emails
grep -Eio '\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b' contact.html | sort -u
Windows PowerShell equivalent:
$urls = Invoke-RestMethod -Uri "https://web.archive.org/cdx/search/cdx?url=example.com/&output=json"
$urls[1..$urls.Count] | ForEach-Object { $_[bash] } | Out-File urls.txt
Download archived page
Invoke-WebRequest -Uri "https://web.archive.org/web/20241001000000/https://example.com/contact.html" -OutFile contact.html
Extract emails
Select-String -Path contact.html -Pattern '\b[\w\.-]+@[\w\.-]+\.\w+\b' -AllMatches | ForEach-Object {$_.Matches.Value} | Sort-Object -Unique
2. Using Kronikier’s Web App for Rapid OSINT
Kronikier’s interface simplifies the process for non‑technical investigators. After accessing the live tool (linked via the original post’s URL), follow these steps:
Step‑by‑step guide:
1. Navigate to `https://lnkd.in/d8kyCfCp` (shortened LinkedIn link – expand to Kronikier’s actual domain if needed).
2. Enter the target domain (e.g., `company.com`).
3. Click “Scan” – the tool will query Archive.org’s CDX API.
4. Review the resulting table: columns for email/phone, archived page URL, and capture date.
5. Export results as CSV for further analysis.
Pro tip: The tool may rate‑limit requests. For large domains, use the `?limit=1000` parameter in the CDX API manually to avoid timeouts.
3. Extracting Phone Numbers with Regex and Post‑Processing
Phone number formats vary globally. Kronikier uses patterns like `\+?[0-9]{1,3}?[-.\s]?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}`. You can refine this using `grep` on Linux or `findstr` on Windows.
Linux command to extract North American and international numbers:
curl -s "https://web.archive.org/web/20241001000000/https://example.com/contact.html" | grep -Eo '(\+[0-9]{1,3}[ -]?)?\(?[0-9]{3}\)?[ -]?[0-9]{3}[ -]?[0-9]{4}' | sort -u
Windows (findstr with limited regex):
Get-Content contact.html | Select-String -Pattern '\+?[\d\-\(\) ]{10,15}' | ForEach-Object { $_.Matches.Value }
Mitigation for defenders: Use `robots.txt` to disallow archive bots – add `User-agent: ia_archiver` and `Disallow: /contact/`. However, already archived pages require a removal request to Archive.org’s “Remove URL” process.
4. Automating Archive.org Scraping with Python (Ethical Use)
For batch analysis, a Python script can replicate Kronikier’s functionality while adding custom filters.
import requests, re
from urllib.parse import urljoin
domain = "example.com"
cdx_url = f"https://web.archive.org/cdx/search/cdx?url={domain}/&output=json"
snapshots = requests.get(cdx_url).json()
emails = set()
phones = set()
for row in snapshots[1:]: skip header
timestamp, original_url = row[bash], row[bash]
archived_url = f"https://web.archive.org/web/{timestamp}/{original_url}"
try:
html = requests.get(archived_url, timeout=10).text
emails.update(re.findall(r'[\w\.-]+@[\w\.-]+\.\w+', html))
phones.update(re.findall(r'\+?\d[\d\s\-\(\)]{8,}\d', html))
except:
continue
print("Emails:", emails)
print("Phones:", phones)
Security note: Always obtain written permission before scanning third‑party domains. Unauthorized OSINT may violate laws like the CFAA or GDPR if the data is used for harmful purposes.
5. Defensive Hardening: Removing Leaked Data from Archive.org
If you discover your own email or phone number in archived pages, request removal:
Step‑by‑step guide for individuals:
1. Locate the archived page URL (e.g., `https://web.archive.org/web/20241001000000/https://yoursite.com/contact`).
2. Visit `https://web.archive.org/` and scroll to the bottom – click “Contact” or “Remove content”.
3. Fill out the “Request to remove pages from the Wayback Machine” form. You’ll need to prove ownership (e.g., adding a meta tag or uploading a file to your live site).
4. Archive.org typically removes pages within 2‑4 weeks.
5. To prevent future archiving, add to your `robots.txt`:
User-agent: ia_archiver Disallow: /
For cloud‑hosted applications: Implement HTTP headers `X‑Archive‑Disable: true` (unofficial but respected by some archive crawlers) and use `Cache‑Control: no‑archive`.
6. Advanced API Security & Cloud Hardening Against OSINT
Attackers combine Kronikier‑like tools with other APIs to build comprehensive profiles. Defend your cloud assets by:
– Restricting email enumeration: Never use incrementing IDs in contact forms. Implement rate limiting and CAPTCHA.
– Using DMARC/DKIM/SPF to prevent spoofing of discovered emails.
– Monitoring for leaked credentials via services like Have I Been Pwned’s API.
– Linux hardening command to scan your own web logs for suspicious archive.org user‑agents:
grep "ia_archiver" /var/log/nginx/access.log | awk '{print $1}' | sort -u
– Azure/AWS CLI to detect unusual API calls that may signal OSINT reconnaissance:
aws cloudtrail lookup-events --lookup-attributes AttributeKey=EventName,AttributeValue=GetObject --max-items 50
7. Vulnerability Exploitation & Mitigation: When Emails Leak to Phishing
Emails extracted via Kronikier become targets for spear‑phishing. Simulate an attack to test your organization:
Proof‑of‑concept (authorized only):
1. Use Kronikier to find a valid employee email.
2. Craft a phishing email with a malicious link (e.g., `https://evil.com/login`).
3. Deploy using Gophish (open‑source framework) – install on Linux:
wget https://github.com/gophish/gophish/releases/download/v0.12.1/gophish-v0.12.1-linux-64bit.zip unzip gophish-.zip && cd gophish- sudo ./gophish
4. After the test, train staff to report suspicious emails and implement MFA.
Mitigation: Enforce DMARC quarantine (`p=quarantine`) and use email filtering with attachment sandboxing. Regularly scan Archive.org for your own domain using Kronikier or the manual scripts above.
What Undercode Say:
– Key Takeaway 1: Kronikier dramatically lowers the barrier for Archive‑based OSINT – what used to require custom scripts is now a one‑click web app, making both ethical hackers and malicious actors more efficient.
– Key Takeaway 2: Defenders must proactively search for their own exposed contact data on Archive.org and request removal. Relying solely on `robots.txt` is insufficient for already‑cached pages.
Analysis (approx. 10 lines):
Undercode emphasizes that tools like Kronikier highlight a fundamental tension: the internet’s memory is permanent, but privacy expectations are not. While Archive.org serves a vital historical function, it also acts as a massive attack surface for social engineering and credential stuffing. The post’s original author, Logan Woodward, correctly flags the tool’s utility, but the real lesson is organizational – companies should integrate “historical web scraping” into their threat modeling. Additionally, many developers forget that old versions of their sites may contain debug endpoints, backup config files, or employee directories. A single archived `[email protected]` can kickstart a business email compromise campaign. Therefore, regular OSINT audits using Kronikier or manual methods should become standard practice for security teams.
Prediction:
– +1 Increased adoption of automated OSINT tools will push Archive.org to implement stricter rate limiting, CAPTCHA, or authentication for CDX API access, forcing tool developers to adopt distributed or paid models.
– -1 Regulatory backlash may arise – GDPR’s “right to be forgotten” clashes with Archive.org’s non‑profit archiving mission. Expect lawsuits that could force the removal of historical snapshots, weakening public access to web history.
– -1 Cybercriminal commoditization of Kronikier‑like functionality will lead to specialized Telegram bots that sell email‑phone pairs from the archive, accelerating account takeover attacks.
– +1 Defenders will build automated monitoring that continuously checks Archive.org for their own domains, triggering alerts when new emails or phones appear, turning OSINT against the attackers.
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