LeakBase Archivum Logs Exposed More Per Account Than Larger Breaches

HEROIC analysts discovered a stealer log called "Archivum," posted by the user kibertolog on a well-known underground hacking forum on June 13, 2024. Although the total number of records is relatively small at 128 accounts, what stood out immediately was the depth of information captured for each victim. The log did not simply contain a username and password. It included email addresses, plaintext passwords, homepage URLs, IP addresses, and usernames for each compromised account. This level of detail is a direct result of infostealer malware, which harvests far more than just login credentials from an infected device.

Why This Is Dangerous

The danger here is not just in the quantity of records but in the quality. Each entry in this leak gives an attacker multiple attack paths at once. A plaintext password can be used immediately to access accounts. A homepage URL reveals what sites the victim frequented. An IP address can help narrow down a victim's location or identify their organization. Together, these data points make every single one of the 128 victims a well-profiled target. Criminals do not need millions of records when each record they do have is this rich with useable detail.

What Was Exposed

The following personal data types were confirmed in this leak:

• Email addresses
• Plaintext passwords
• Homepage URLs
• IP addresses
• Usernames

Why This Matters

Even a small breach like this one creates real risk. The plaintext passwords enable immediate credential stuffing attacks, where criminals test the stolen logins across popular websites, banking apps, and email providers. With email addresses and usernames also in hand, attackers can craft convincing phishing messages that appear to come from a trusted source. IP address data adds another layer of danger, as it can be used to map out where victims live or work, enabling more targeted social engineering and potentially identity theft. The fact that this data occured on an open forum means it was accessable to a wide range of bad actors, not just the original poster.

How a Stealer Log Breach Works

A stealer log is created when infostealer malware infects a personal or work computer. The malware, often installed silently through a malicious email attachment, a fake software installer, or a drive-by download from a compromised website, scans the infected device for saved credentials. It checks browser password managers, saved cookies, and application login data. All of that information is bundled into a structured log file and sent back to whoever deployed the malware. These logs are then packaged and sold or shared on underground forums, sometimes within hours of the infection occurring. The victim has no idea their data was taken until it is too late.

Check If You Are Affected

If you believe your device may have been compromised, or if you want to know whether your email address shows up in any known data leak, HEROIC's free breach scanner can help. With coverage of more than 400 billion records across hundreds of known breaches, including the LeakBase Archivum Logs by kibertolog, checking takes only a few seconds. If your email appears, update your passwords right away, particularly on any account where you may have reused the same credentials, and turn on two-factor authentication wherever it is availble.