Was g-s.co.uk hit by ransomware?

g-s.co.uk was listed by the Black Basta ransomware operation (United Kingdom), 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 Black Basta ransomware group?

Black Basta 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 g-s.co.uk breach?

Black Basta published data attributed to g-s.co.uk (~1.5 TB), around 4. Users records. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Graham + Sibbald

listed as g-s.co.uk · Claimed by Black Basta · listed 2 years ago

1.5 TB

Data size

4. Users records

19m

Age

since listed · data leaked

Status timeline

ListedDec 4, 2024
Data leakeddate unknown

At a glance

Group: Black Basta
Status: Data leaked
Country: United Kingdom
Sector: Agriculture and Food Production
Listed on leak site: Dec 4, 2024
Data size: 1.5 TB
Records: 4. Users

About the victim

AI dossier — public-source company profile

Graham + Sibbald is a UK-based chartered surveyor and property consultancy firm offering commercial, residential, and construction services across the UK. The firm provides valuations, lease consultancy, asset services, and specialized surveying for sectors including healthcare, education, and public infrastructure.

Industry: Property Consultancy & Chartered Surveying
Address: 3 Charlotte Street, Perth, Perthshire, PH1 5LW, United Kingdom

Attack summary

Severity: critical — Confirmed exfiltration and publication of 1.5 TB of data including personal documents of employees and clients (PII at scale), financial records, and corporate data. Property consultancy firms handle sensitive client information, financial details, and personal data for residential and commercial transactions.

Black Basta claims to have exfiltrated approximately 1.5 TB of data from Graham + Sibbald, including personal documents (employees and clients), financial data, user data, and corporate records. The group has published the data.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Employee personal documents
Client personal documents
Financial data
User data
Corporate data

What the group claims

Graham + Sibbald is one of the UK’s leading property consultancy services. Our success is built upon how we deliver our service; it is a unique combination of being both professional and personable. Graham + Sibbald has a long-standing history of supporting and delivering community benefits. This ranges from offering work placements/shadowing experiences for secondary school children across our office network, working in partnership with local schools by surveyor participation and attendance at career fairs/ STEM practical workshops to supporting Modern and Graduate Apprentices through our dedicated Career Programmes.SITE: www.g-s.co.uk Address : 3 Charlotte Street, Perth Perthshire, PH1 5LW United KingdomTEL#: +44 1738 445733ALL DATA SIZE: ≈1.5tb 1. Personal documents Employees 2. Personal documents Clients 3. Financial data 4. Users data 5. Another Corporate data & etc…

Sources

Victim siteg-s.co.uk

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 Black Basta

Black Basta is a financially motivated ransomware group that emerged in April 2022 and has since compromised approximately 800 organizations worldwide. The group operates as a Ransomware-as-a-Service (RaaS) model with suspected ties to the now-defunct Conti ransomware operation, though their exact country of origin remains unconfirmed by law enforcement agencies. Black Basta primarily gains initial access through phishing campaigns, exploitation of known vulnerabilities, and credential stuffing attacks, subsequently deploying their custom ransomware that employs ChaCha20 encryption algorithm and employs double extortion tactics by exfiltrating sensitive data before encryption and threatening to publish it on their leak site if ransom demands are not met. The group has demonstrated a preference for targeting organizations in the United States, United Kingdom, Germany, Canada, and Italy, with a particular focus on business services, manufacturing, technology, healthcare, and agriculture sectors. Notable victims have included various healthcare systems and manufacturing companies, though specific ransom amounts and high-profile attacks have not been widely disclosed in public law enforcement advisories. As of 2024, Black Basta remains an active threat with continued operations and regular updates to their leak site indicating ongoing compromise activities. The group has been linked to 1,323 public disclosures across our corpus. First observed on a leak site on April 26, 2022; most recent post January 11, 2025. The operation is currently inactive.

Also tracked as: BlackBasta.

Timeline of this disclosure

December 4, 2024g-s.co.uk listed by Black Bastaon the group's public leak site

Data size: 1.5 TB
Records: 4. Users

Other recent disclosures by Black Basta

Black Basta has been linked to 1,323 public victims on Darkfield. A sample of the most recent:

See the full Black Basta dossier →

Sector and geography

This disclosure adds to ransomware activity in the Agriculture and Food Production sector, which has 772 disclosures indexed across all operators we track. Geographically, g-s.co.uk is reported in United Kingdom, a country with 1,217 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Black Basta means g-s.co.uk 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, NCSC (United Kingdom), as required for your jurisdiction.
Monitor for the data appearing on Black Basta'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.