Already Reportedly Compromised: C2N Leak Exposes 2,706 Records
HEROIC analysts reportedly identified a file tied to C2N, a business website, that surfaced in August 2023 and contains 2,706 records with email addresses and plaintext passwords. The data appears to have circulated on a hacking forum before being shared further through Telegram channels. Scanning your email is the clearest way to confirm whether your information is included.
What Was Exposed
Key finding99.6% of records pair an email address with a password.
What the C2N File Reportedly Contains
- Email Address: gives an attacker a verified contact to target with follow-up phishing.
- Plaintext Password: usable right away, without any cracking or extra work required.
Why a Small, Quiet Leak Still Deserves Attention
A reused password from this file can let an attacker reach an email login and, from there, reset access to other connected services. The resulting exposure can lead to unauthorized logins, redirected communications, or follow-up phishing that looks convincing because it references real details. None of this requires the attacker to do anything particularly sophisticated once reuse is confirmed.
How a Business Database Like This One Gets Taken
This kind of leak typically starts with unauthorized access to a company's own stored records, which are then copied out as a single complete set rather than gathered device by device. The file commonly changes hands on forums focused on stolen data before spreading more widely through Telegram. That bulk, one-time nature is what separates a database leak from credentials pulled from individual infected devices over time.
Data exposed in this breach
Email addresses appear in 100% of the 2,706 records in this breach, alongside plain-text passwords (99.6%). 99.6% of records (2,694) pair an email address with a password.
An email address and password together are a working login. Attackers feed pairs like these into automated tools that try them on banking, shopping and email sites, so anyone who reused the password elsewhere is exposed there too.
- Domain
- c2n.biz
- Date leaked
- 01 Aug 2023
- Records in breach
- 2,706
Email providers and account types
32.9% of the email addresses in this breach are personal mailboxes and 67.1% are work addresses. The most common provider is mail.ru, followed by rambler.ru and gmail.com.
Work addresses matter because a password reused on a company account can give attackers a way into that organisation. The company domains below show which employers appear most often.
Mailbox type
- Personal mailboxes32.9%
- Work mailboxes67.1%
Email providers
- 1mail.ru386
- 2rambler.ru150
- 3gmail.com140
- 4yandex.ru119
- 5ya.ru27
- 6list.ru18
- 7inbox.ru9
- 8yahoo.com9
- 9bk.ru8
- 10yandex.ua6
- 11gmail.ru3
- 12mail.com2
- 13qmail.com2
- 14google.com1
- 15uandex.ru1
Company domains
| # | Domain | Accounts | Share of records |
|---|---|---|---|
| 1 | ukr.net | 427 | 15.8% |
| 2 | meta.ua | 106 | 3.9% |
| 3 | ukrpost.ua | 88 | 3.3% |
| 4 | i.ua | 62 | 2.3% |
| 5 | bigmir.net | 27 | 1% |
| 6 | poltava.ukrtel.net | 25 | 0.9% |
| 7 | bgp.by | 24 | 0.9% |
| 8 | zp.ukrtel.net | 22 | 0.8% |
| 9 | ivkportal.com.ua | 20 | 0.7% |
| 10 | vc.ukrtel.net | 20 | 0.7% |
| 11 | mail.lviv.ua | 18 | 0.7% |
| 12 | tut.by | 17 | 0.6% |
| 13 | sobes-ter.gov.ua | 12 | 0.4% |
| 14 | mail.zp.ua | 10 | 0.4% |
| 15 | bel.com.ua | 8 | 0.3% |
Password Analysis
Key finding0.1% of passwords in this breach are reused, and 98.9% are 8 characters or fewer.
Password strength
Of the 2,694 passwords analysed, 0.1% appear more than once, and the single most common password accounts for 0.1% of them. The average password is 6.1 characters long.
100% contain no special character, 0.1% are numbers only and 1.2% are lowercase letters only. Passwords built this way are the first ones cracking tools try, which is why length and a mix of character types matter.
Password habits
Password length
The most common length is 1-6 characters, covering 98.9% of passwords. 98.9% are 8 characters or fewer.
Every extra character multiplies the number of guesses an attacker needs. Passwords of 8 characters or fewer can be cracked quickly once they leak, while long passphrases hold up far better.
Share of passwords by length
- 8 characters or fewer
- 9 characters or more
Most common passwords
The most common password appears 2 times, and the top 15 together account for 18 uses. Passwords are masked here: only their first characters are shown, next to each password's true length.
When many accounts share one password it usually points to a default password, a shared team password or a common pattern such as a name followed by numbers. Treat any password on this list as public.
- 194****6 chars2
- 21****5 chars2
- 3Oa****6 chars2
- 43f****6 chars1
- 558F********11 chars1
- 6k1****6 chars1
- 7dH****6 chars1
- 81B****6 chars1
- 9QB****6 chars1
- 10VS****6 chars1
- 11MB****6 chars1
- 12PU****6 chars1
- 13LY****6 chars1
- 14TT****6 chars1
- 15DR****6 chars1
Why Plaintext C2N Logins Deserve a Calm, Quick Check
Because the passwords in this file are not hashed, they can be read and used immediately by anyone who obtains it. An attacker typically tests each email and password pair against other common services, relying on people reusing the same password. This makes a prompt but straightforward password change the most effective response.
How Do You Check If You're in the C2N File?
Use the scan your email tool above to check your address against this file calmly and privately. If the password is one you still use elsewhere, change it on each of those services as soon as you reasonably can. Check any work email the same way, since the exposure risk doesn't depend on which inbox the password was reused on.
Leaked in this breach: email address, plaintext password
Is your email in the C2N leak?
Check your email against this breach and billions of other leaked records. If it shows up, we'll tell you exactly what to change.
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Threat Intelligence
Key finding1 records from c2n.biz staff appear in 1 other breaches.
Employees of c2n.biz in other breaches
1 records from c2n.biz staff turn up in 1 other breaches. The most common sources are Verifications.io.
Organisations in this position should reset passwords for the affected addresses and require multi-factor authentication.
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