"Email Data Leak Lookup"

Guide to Checking Email Data Leaks

In this article, we’ll cover what an email data leak is,how to check if you have been effected by a leak, what types of information are typically stolen, and provide a basic introduction to password hashes. Understanding hashes is crucial, it helps you estimate whether your leaked passwords could have been cracked. If you’d like to skip ahead to the lookup tools section, click here or scroll down.

What is a data leak?

1. when a website or online service experiences unauthorized access to its stored user information. In most cases, individuals provide personal data such as email addresses, passwords, and other identifiers during account registration. If the service’s database is compromised, this information can be extracted and may later appear for sale or distribution on dark web marketplaces.

2.more dangerously, the system(your pc, smartphone) may be compromised by malware, commonly referred to as viruses. The severity depends on the specific type of malware involved. The five most prevalent info-stealer viruses in recent years are:

* RedLine Stealer * Raccoon Stealer * Vidar Stealer * Lumma Stealer (aka LummaC2) * Agent Tesla

• What kind of information Is commonly stolen by viruses?
  • Usernames and passwords saved in browsers, including the associated website
  • Usernames, passwords, and URLs manually typed into websites
  • Autofill form data (names, addresses, phone numbers)
  • Cookies and session tokens (to hijack active logins)
  • Credit card numbers and payment info stored in browsers or logged by keyboard.
  • Cryptocurrency wallet data and private keys
  • Installed software and system information (to profile the victim)
  • Screenshots or clipboard contents (sometimes)
  • Email client credentials (e.g., Outlook, Thunderbird)
  • VPN and FTP client login data
  • Files or documents from specific folders (in some variants)
  • Lists of saved sites and accounts (e.g., bookmarks, saved passwords)
  • Browser history and activity logs
  • Capture anything typed on the keyboard

Password hash types and plain text passwords

Before examining the available lookup tools, it is important to address the difference between plain text and hashed passwords leaks. Hashing is a method used to convert a password into an irreversible string of characters. This process is intended to protect passwords, so that even if a website is compromised, the stored passwords are not immediately usable. However, if your system is compromised by a virus all passwords and data are logged in plain text. Hashing only protects data stored in a website database.

Hash types vary in strength. From weakest to strongest, the most commonly encountered are:

• Password hash types
  • Plain text- means the password is not encrypted and can be used immediately.
  • MD5 – Outdated and insecure. If your password was hashed using MD5 and exposed in a breach, consider it compromised with over 99% certainty (depending on complexity).
  • MD5 + Salt – Prevents rainbow table attacks but remains weak due to MD5’s speed. If the password is weak or common, consider it exposed with roughly 90% certainty (depending on complexity).
  • SHA-1 – If your password was hashed with unsalted SHA-1 and exposed in a breach, consider it compromised with ~95% certainty, especially if it's common and not complex.
  • SHA-1 + salt– For common or weak passwords, consider it ~85–90% likely that an attacker can still crack it using modern tools depending on complexity.
  • bcrypt – A password-hashing algorithm designed for security. It includes automatic salting and a configurable cost factor, which slows down each cracking attempt. Passwords with 8 or more characters containing numbers, lowercase, and uppercase letters are effectively nearly 100% safe against current cracking methods. However, passwords composed of numbers only or letters only can be cracked within hours, days, or weeks, depending on their length and complexity.

In conclusion, hashing offers effective protection only when combined with strong, complex passwords and secure hashing algorithms. bcrypt, for example, demonstrates its full defensive potential when applied to long and complicated passwords. For example this password ‘A2u5(D8E[;85’).However, if the system(your PC, smartphone) is compromised by malware, all data including passwords is captured in plain text as it is typed/stored in browser, rendering hashing irrelevant. In such cases, credentials may be harvested and used immediately.

How to Check If You’ve Been Affected

To obtain the most complete results, it is recommended to use a combination of data breach monitoring tools. While full access to leaked data often requires a paid subscription, most services will show the types of information that were exposed. This typically includes items such as email addresses, passwords, phone numbers, government IDs, security questions, physical addresses, IP addresses, usernames, and other personal identifiers.

haveibeenpwned.com – This is the primary tool for checking exposure in public data breaches. While it does not reveal the actual leaked content, it shows whether your email address was involved and what types of data were exposed. To use it, search for "Have I Been Pwned" in any search engine, visit the website, and enter your email address in the search field. The system will return a list of associated breaches their data and password hash type.

If your system was compromised by virus, the result may appear under “stealer logs.” Breaches originating from websites are labeled as “breach” or “leak.” Note that localized website leaks (your country postal website) and records found in large compilations such as COMB (Compilation of Many Breaches) may not be indexed here. Additional tools are required to improve detection coverage.

Intelx.io - provides deeper-level results, including data from localized websites. For instance, if a national postal service is compromised, evidence of the breach is likely to surface here first. The platform also lists large-scale data dumps referred to as "collections"—massive archives of email and password combinations. Common examples include Collection #1–#5, exploit.in, and Anti Public.

To access the site, search for “IntelX” using any search engine. Enter your email address to begin. Unlike Have I Been Pwned, IntelX does not specify the type of data exposed. For context or additional details, you may need to look up related news reports. Searching the breach title or collection name can often lead to more information about what kind of data was leaked. for malware/virus stealer logs leaks click on the leak title and than metadata. stealer logs appear as leak>logs in category.

Leakpeek.com– leakPeek is a paid service that displays partial password data for guests. For example, a password like “123456” may appear as “123***,” offering a clear indication of which passwords have likely been cracked. To access it, search “LeakPeek” using any search engine. click on email from the pink menu and see partial leaked passwords related to that email. the keyword tab is likely for usernames/email usernames while password search shows if a password was leaked in any case the email will always be ******@hotmail.com or other random string for password search, even if the email was gmail or any other provider. on the right side you will see a domain name indicating leak source else it will show unknown

proxynova.com/tools/comb - is a free service that allows you to search your email the COMB (Compilation of Many Breaches). To use it, simply search for “proxynova comb” on any search engine. Unlike some other tools, this service does not censor passwords. Type your email in the search box to see if you were exposed. The passwords in the COMB are mostly from unknown sources or old leaks like myspace.com

While there are more leak search sites, for the average user these sites are enough to find his leaked data types.if you need any help regarding your leaked data you can contact me and I will try to help for a small fee, keep in mind I will need to verifiy you own the email address.

How to defend from future leaks?

Using “Login with Gmail or Facebook” lets those providers handle your password, so the site won’t store your password hash and it won’t be exposed if the site is breached. However, be cautious some phishing sites mimic these login boxes, so only use this option on trusted websites.

Use long, complex passwords to reduce the risk of them being cracked. Avoid reusing passwords across services. Limit the personal information you share consider using a secondary email or phone number for less secure websites.

To protect against infostealers and malware, avoid pirated software. Stick to free legitimate alternatives or pay for trusted versions. Downloading cracked software or unknown files is one of the most common ways systems get compromised. Look out for suspicious files inside emails. For more information about info stealers click here.

Conclusion

Data leaks have happened in the past and will continue to occur. This guide offers a basic understanding of the risks and how to respond. When signing up for any service, assume that your data could eventually be exposed. If you are a person of interest or hold sensitive roles, it's critical to assess whether leaked information could be used in more targeted or sophisticated attacks. Staying aware and prepared is the best defense.