MARVEL CLOUD Leak: 1,770 Plaintext US Passwords Exposed

HEROIC analysts identified a stealer log called MARVEL CLOUD uploaded to a Telegram channel on January 13, 2023. The file contained 1,770 records pulled from infected US devices, pairing email addresses with plaintext passwords and the URLs those logins access.

Why This Is Dangerous

Every password in this file is stored in plain text, so there is nothing for an attacker to crack or guess. Combined with the exact URL tied to each credential, MARVEL CLOUD gives whoever holds it a ready-made list of working logins they can test immediately against the correct sites.

What Was Exposed

• 1,770 individual records
• Email addresses
• Plaintext passwords
• Associated login URLs
• Endpoint data concentrated in the United States

Why This Matters

A leak this size may look small, but the risk is not. Attackers run leaked email and password pairs through credential stuffing tools that test the same login across banking, retail, and email platforms in bulk. Anyone who reused this password elsewhere is exposed there too, and the linked email address becomes a target for follow-on phishing and account recovery abuse.

How a Stealer Log Like MARVEL CLOUD Gets Made

This is not a breach of a corporate database, it is the output of infostealer malware that ran on individual victims' computers, usually installed through a cracked download or a fake installer. The malware silently copies saved browser passwords and cookies, then sends them back to its operator. That operator packages harvests like this 1,770-record file and shares them on Telegram to build a following or sell to other criminals.

Check If You Are Affected

HEROIC's free breach scanner checks your email address against more than 400 billion leaked records, including stealer logs like MARVEL CLOUD, so you can confirm your exposure in seconds and change any reused passwords before someone else does.