high severity November 17, 2023 · 3 min read Unverified claim — what this is

ISC Consulting Engineers Listed by Cactus Ransomware Group

If you are a customer of ISC Consulting Engineers, here’s what is being claimed, and what it would mean for you.

ISC Consulting Engineers was listed on Cactus's leak site. Cactus claims to have stolen internal data. This is the group's claim, not a confirmed finding.

ISC Consulting Engineers Listed by Cactus Ransomware Group

On November 17, 2023, Danish engineering firm ISC Consulting Engineers appeared on the leak site operated by the cactus ransomware group. The listing states that internal files were exfiltrated during a ransomware attack on the company, which provides specialist design and engineering services for offshore wind, renewable energy, and oil-and-gas projects worldwide. Anyone whose personal or professional data was stored in those systems may now be exposed.

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Reported Details from the Listing

The cactus leak site entry, first observed on November 17, 2023, claims that ISC Consulting Engineers suffered a ransomware intrusion in which attackers successfully exfiltrated internal files. The disclosure does not quantify the number of records affected, nor does it list specific data types such as customer records, employee details, or project documentation. It simply states that data was taken and is now held by the group. The company has not yet published a formal breach notification detailing the precise scope, so the exact volume and sensitivity of the stolen information remain unknown to the public.

Why This Matters for You and Your Family

When an engineering services company like ISC is breached, the ripple effects reach far beyond the corporate perimeter. Employees, contractors, clients, and business partners may have had names, email addresses, phone numbers, project-related correspondence, or even financial details stored in the compromised systems. If any of that information belongs to you or someone in your household, it can be used to launch targeted phishing, identity theft, or follow-on attacks. Offshore wind and energy-sector data can also attract nation-state interest, raising the possibility that personal details are being cross-referenced with other breaches to build detailed profiles.

The Doxxing and Identity-Chain Risk

Exfiltrated internal files frequently contain spreadsheets, emails, and directories that link work identities to personal ones. A single leaked work email can be chained with gaming usernames, family addresses, or children’s school accounts to create a complete identity map. Attackers then use these chains to impersonate family members, hijack accounts, or sell the bundle on underground forums. Credential leaks of this nature routinely cascade into gaming-account takeovers, especially when the same password is reused for a child’s Roblox, Fortnite, or Steam profile. The longer the chain remains unmonitored, the higher the chance that one breach becomes many.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Cactus · 247 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed November 17, 2023

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Cactus — 247 incidents tracked

Every breach we've attributed to Cactus, in one running log. See who else they've hit →

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