Search Your Email: The Sinisterly Dump Exposed 2,359 Accounts

Sinisterly (sinister.ly) was a US-based online general discussion forum that operated in the early 2010s. In May 2013, the forum's database was breached, exposing 2,359 user accounts. The stolen data includes email addresses, usernames, IP addresses, MyBB password hashes, and a hash type field identifying the exact algorithm used for each account. The breach is verified and has been referenced in breach aggregation databases alongside other MyBB forum dumps from the same period.

Why Sinisterly Breach Is Dangerous

The hash type field in the Sinisterly dataset removes all uncertainty for attackers attempting to crack the MyBB hashes. Instead of running multipule algorithm attempts against each record, attackers can process each password using the definitly correct method from the start. MyBB hashes from 2013 are crackable with modern hardware, and the inclusion of the algorithm identifier for each record accelerates the process considerably. The email addresses make the resulting cracked credentials immediately testable against real accounts.

What Was Exposed in the Sinisterly Leak

• Email Address
• Username
• IP Address
• MyBB Password Hash
• Hash Type Identifier

Why This Sinisterly Data Puts You at Risk

The IP address data in this breach creates a geographic link between a user's identity and their location at the time of registration. For users who registered with a home or work IP, that address can be correlated with other databases to build a more complete identity profile. Combined with a cracked password and a real email address, the Sinisterly dataset provides enough information to conduct convincing targeted phishing against individual users.

What the Hash Type Field Reveals to Attackers

When a database exposes a hash type field alongside the password hash itself, it is providing attackers a significant advantage. In most breach datasets, attackers need to probe each hash to determine which algorithm was used, which takes time and may produce incorrect results. The Sinisterly breach occured with hash type identifiers included per record, meaning each MyBB hash is pre-labeled for cracking. This pattern, seen in several MyBB-based forum breaches from 2013, is particularly useful for automating large-scale password recovery across aggregated forum datasets.

Check If Your Data Was Exposed

HEROIC's free breach search checks your email against 400 billion+ compromised records, including the Sinisterly dataset. Search now to confirm whether your account was part of this breach. If you registered on Sinisterly in 2013, update any accounts that shared your registration password and check whether your email appears in additional breach datasets from the same period.