Researchers Link the 13k Corps Dump to 12,964 Stolen Credentials

Researchers Link the 13k Corps Dump to a Stealer Log Upload

HEROIC's threat intelligence team identified a stealer log titled "13k Corps" uploaded to Telegram by an anonymous user, dated January 18, 2023. The file contained 12,964 records, each combining an email address, a plaintext password, and the URL of the login page the credentials were used on.

Researchers Link the 13k Corps Dump to 12,964 Stolen Credentials

HEROIC analysts tracing the file back to its source found a pattern common to corporate-focused stealer logs: the credentials inside were harvested from individual employee devices rather than a single company breach, then grouped together under a name suggesting a business or organizational theme. That distinction matters because it means the exposure likely spans many different employers rather than one.

What Was Exposed in the 13k Corps Log

• Email addresses used to log into online accounts
• Plaintext passwords tied to those accounts
• The website URLs each credential pair was used on

Why This Matters for the 12,964 People in This Log

If any of the 12,964 people affected reused their password on work accounts, email, or internal systems, this data becomes a direct path to account takeover and, potentially, further compromise inside an organization's network. Credential stuffing attacks specifically target reused passwords like these, testing them against many services at once.

How Stealer Logs Like 13k Corps Are Built

This data comes from infostealer malware, which infects a device through phishing emails, cracked software, or malicious downloads, then silently harvests saved browser passwords and autofill data. Logs are often labeled by the seller to signal what kind of accounts are inside, in this case suggesting a corporate or business focus, before being shared or sold on Telegram.

Check If You Are Affected

Whether your accounts are personal or work-related, it's worth checking if your credentials appear in the 13k Corps log or another stealer dump. HEROIC's free breach scanner searches a database of more than 400 billion compromised records, so you can quickly find out and change any passwords still in use.