Was Mutual Underwriters hit by ransomware?

Mutual Underwriters was listed by the alphv ransomware operation, 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 alphv ransomware group?

alphv 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 Mutual Underwriters breach?

alphv published data attributed to Mutual Underwriters. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Mutual Underwriters

Claimed by Alphv · listed 3 years ago

33m

Age

since listed · data leaked

Status timeline

ListedOct 27, 2023
Data leakeddate unknown

At a glance

Group: Alphv
Status: Data leaked
Sector: Financial Services
Listed on leak site: Oct 27, 2023

About the victim

AI dossier — public-source company profile

Mutual Underwriters is an insurance provider based in Hawaii, operating since 1958. They offer personal insurance (home, vehicle, family health) and commercial insurance products to customers in Hawaii and beyond.

Industry: Insurance
Founded: 1958

Attack summary

Severity: critical — Confirmed exfiltration of 700GB+ of regulated financial and personal data at scale, including PII, insurance details, financial records, and employee credentials. Data has been published. Impacts customers and employees across Hawaii.

ALPHV claims to have exfiltrated over 700GB of data from Mutual Underwriters, including detailed insurance information, financial records, employee credentials, and access to insurance provider applications. The group published the data after failed ransom negotiations.

critical

Data the group says was taken

AI dossier — extracted from the leak post

detailed insurance information (names, payment amounts, contacts, addresses)
financial data (transfers, payments)
insurance provider application access credentials
employee personal details (contacts, payments, passwords)
sensitive customer and employee data

What the group claims

Top insurance providers in Hawaii. Since 1958,Mutual Underwriters have provided insurance to folks in Hawaii and have expanded our services to include every type of insurance whether it's for your home, vehicle or family health. We also offer insurance for commercial needs. Over 700GB of personal data were stolen from there, including: - detailed insurance information (name of insured, amount of payments, contacts, address, etc) - financial data (transfers, payments, etc) - access to insurance providers applications (with possibility to manage insurances) - employees personal details (contacts, payments, passwords to personal services, etc) - other sensitive data elated to customers and employees which supposed to be protected Unfortunately for ordinary people the top management of Mutual Underwriters offered only "words" to protect their data. This sum is unacceptable. Since all the time needed for their bosses to make a decision were given and all the evidences were provided, Mutual Underwriters decided to stop the negotiation process, you can find all the data stolen from them for free download now.

Sources

Source

Indexed 3 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 alphv

ALPHV, also known as BlackCat or Noberus, is a financially motivated ransomware group that emerged in September 2021 and rapidly established itself as one of the most sophisticated and prolific ransomware operations observed by researchers at Mandiant, CISA, and the FBI. The group is suspected to have Russian-speaking origins and operates as a Ransomware-as-a-Service (RaaS) platform, with well-documented links to former affiliates of the DarkSide and BlackMatter ransomware operations, suggesting a continuity of personnel and tradecraft across these successive rebrand events. ALPHV is technically distinguished by its use of Rust-based ransomware — an uncommon choice at the time of its emergence — which enabled cross-platform attacks against Windows, Linux, and VMware ESXi environments; the group employs multiple initial access vectors including compromised credentials, phishing, and exploitation of unpatched vulnerabilities, and routinely conducts double and triple extortion by exfiltrating sensitive data prior to encryption and threatening victims with public disclosure on their dedicated leak site, with some cases involving additional pressure through direct contact with victim customers and regulators. ALPHV has claimed responsibility for high-profile attacks against MGM Resorts International, Caesars Entertainment, Reddit, and healthcare provider Change Healthcare — the latter representing one of the most disruptive cyberattacks on the U.S. healthcare sector on record, with a reported ransom payment of approximately $22 million — and has accumulated over 731 known victims across the United States, Canada, Australia, the United Kingdom, and Germany, with particular concentration in business services, manufacturing, healthcare, technology, and financial services sectors. In December 2023, the FBI and international partners conducted a disruption operation against ALPHV's infrastructure and released a decryption tool for victims; however, the group subsequently attempted to rebrand and continued operations before an apparent final collapse in March 2024, following an alleged exit scam against affiliates after the Change Healthcare ransom payment, with law enforcement officially attributing the group's infrastructure seizure shortly thereafter. The group has been linked to 731 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post March 3, 2024. The operation is currently inactive.

Also tracked as: BlackCat, Noberus.

Timeline of this disclosure

October 27, 2023Mutual Underwriters listed by alphvon the group's public leak site

Other recent disclosures by alphv

alphv has been linked to 731 public victims on Darkfield. A sample of the most recent:

See the full alphv dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,184 disclosures indexed across all operators we track.

If your organisation is affected

A listing by alphv means Mutual Underwriters 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.
Monitor for the data appearing on alphv'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.