Inside Mansory 9 Stealer Logs: 73,510 Passwords Harvested

HEROIC uncovered a stealer log archive labeled Mansory 9, distributed via Telegram in December 2025, containing 73,510 records of compromised credentials. The data was systematically collected by infostealer malware deployed across multiple infected endpoints, extracting login details directly from browsers and applications in real time.

Plaintext Passwords Eliminate Every Layer of Defense

The credentials within the Mansory 9 collection are stored entirely in plaintext. Unlike breaches where passwords are hashed or salted, these passwords require absolutely no decryption. Any individual who accesses this file can read and use every credential immediately, making this one of the most directly exploitable forms of leaked data.

What Was Exposed

• Email Addresses — identifiers linked to personal, corporate, and service accounts across the web
• Plaintext Passwords — unencrypted credentials captured directly from user input and browser storage
• URLs — exact endpoints revealing which websites and services each victim accessed

Credential Stuffing Amplifies the Damage

Threat actors feed leaked email-and-password pairs into automated credential stuffing tools that test them against thousands of websites simultaneously. Since a large percentage of users recycle the same password across services, a single match from the Mansory 9 logs can grant attackers entry to email inboxes, financial platforms, cloud storage, and more — all from one stolen credential.

The Technical Mechanics of Infostealer Malware

Infostealers are a class of malware engineered to extract sensitive data from compromised systems. They typically arrive through trojanized software installers, malicious browser extensions, or phishing payloads. Once executed, the malware targets browser credential stores, autofill databases, cookie jars, and clipboard contents. The extracted data is structured into log files — organized by domain, email, and password — then exfiltrated to command-and-control servers or directly uploaded to distribution channels like Telegram.

Check If Your Credentials Were Exposed

HEROIC has indexed the full Mansory 9 dataset in its breach scanner. Backed by more than 400 billion records, the scanner can instantly determine if your email or password appears in this collection or any other known data breach. Search your credentials now to identify exposure, then change any compromised passwords and enable two-factor authentication on all critical accounts.