Was Transit Mutual Insurance Corporation hit by ransomware?

Transit Mutual Insurance Corporation was listed by the BianLian ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the BianLian ransomware group?

BianLian is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Transit Mutual Insurance Corporation breach?

BianLian published data attributed to Transit Mutual Insurance Corporation. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Transit Mutual Insurance Corporation

Claimed by BianLian · listed 2 years ago

24m

Age

since listed · data leaked

Status timeline

ListedJul 4, 2024
Data leakeddate unknown

At a glance

Group: BianLian
Status: Data leaked
Country: United States
Sector: Transportation/Logistics
Listed on leak site: Jul 4, 2024

About the victim

AI dossier — public-source company profile

Transit Mutual Insurance Corporation is a not-for-profit mutual insurance provider based in Appleton, Wisconsin. The company specializes in insuring public transit vehicles owned by municipalities throughout Wisconsin.

Industry: Insurance & Risk Management
Address: Appleton, Wisconsin, United States

Attack summary

Severity: medium — Confirmed data publication by BianLian targeting an insurance provider with access to municipal transit data and policyholder information. Sensitivity elevated due to insurance/PII exposure, but proof count and full data scope not detailed in truncated post.

BianLian claims to have breached Transit Mutual Insurance Corporation and published data. The specific data exfiltrated and operational impact are not detailed in the available post excerpt.

medium

Data the group says was taken

AI dossier — extracted from the leak post

insurance records
municipal client information
vehicle/fleet data

What the group claims

Transit Mutual Insurance Corporation of Wisconsin is a not-for-profit mutual insurance corporation. Located in Appleton, Wisconsin, company insures public transit vehicles owned by municipalities located throughout Wisconsin.

Sources

Source

Indexed 2 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About BianLian

**Overview:** BianLian is a financially motivated ransomware group that emerged in July 2022, quickly establishing itself as a significant threat to organizations across multiple sectors. The group operates with a primary focus on extorting victims for financial gain through data encryption and exfiltration tactics. **Origin & Affiliation:** While the exact country of origin remains unconfirmed by public reporting, BianLian appears to operate as an independent ransomware group rather than following a traditional Ransomware-as-a-Service model. Security researchers have not established definitive links between BianLian and other known ransomware families or cybercriminal organizations. **Attack Methodology:** BianLian typically gains initial access through compromised Remote Desktop Protocol (RDP) credentials and exploits of public-facing applications, according to security researchers. The group employs double extortion tactics, stealing sensitive data before encrypting victim systems, and threatens to publish exfiltrated information on their leak site if ransom demands are not met. Their operations demonstrate sophisticated understanding of network environments and data exfiltration techniques. **Notable Campaigns:** Since its emergence, BianLian has successfully compromised over 670 organizations globally, with documented cases spanning critical infrastructure and major corporations across their primary target sectors. The group has been particularly active in targeting healthcare organizations, prompting attention from cybersecurity agencies due to the critical nature of these attacks. **Current Status:** As of recent threat intelligence reporting, BianLian remains an active ransomware threat, continuing to target organizations primarily in the United States, United Kingdom, Canada, India, and Australia. The group has been linked to 668 public disclosures across our corpus. First observed on a leak site on July 14, 2022; most recent post March 31, 2025. The operation is currently inactive.

Also tracked as: Hydra.

Timeline of this disclosure

July 4, 2024Transit Mutual Insurance Corporation listed by BianLianon the group's public leak site

Other recent disclosures by BianLian

BianLian has been linked to 668 public victims on Darkfield. A sample of the most recent:

See the full BianLian dossier →

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 1,081 disclosures indexed across all operators we track. Geographically, Transit Mutual Insurance Corporation is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by BianLian means Transit Mutual Insurance Corporation appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on BianLian's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.