Ransomware victim disclosure

Graham + Sibbald

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

1.5 TB

Data size

4. Users records

18m

Age

since listed · data leaked

Status timeline

Listed
Dec 4, 2024
Data leaked

At a glance

Group: blackbasta
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-leading property consultancy and chartered surveying firm offering commercial, residential, and construction services across the UK. They provide valuations, lease consultancy, building surveying, and asset management services with a nationwide office network.

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

Attack summary

Severity: critical — Confirmed exfiltration of 1.5 TB including employee and client PII, financial records, and sensitive corporate data for a large professional services firm. This represents regulated data at significant scale (employees, clients across multiple sectors including healthcare and NHS).

BlackBasta claims to have exfiltrated approximately 1.5 TB of data from Graham + Sibbald, including personal documents of employees and clients, financial records, user data, and corporate information.

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
Leak posthttp://stniiomyjliimcgkvdszvgen3eaaoz55hreqqx6o77yvmpwt7gklffqd.onion/?id=g-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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About blackbasta

Black Basta is a financially motivated ransomware group that emerged in April 2022 and has rapidly established itself as a significant threat actor, compromising over 500 organizations globally within its first two years of operation. The group is suspected to have ties to Russia-based cybercriminal networks and operates as a Ransomware-as-a-Service (RaaS) model, recruiting affiliates to conduct attacks while the core group maintains the ransomware infrastructure and negotiates with victims. Black Basta primarily gains initial access through phishing campaigns, exploitation of unpatched vulnerabilities, and compromised Remote Desktop Protocol (RDP) credentials, then deploys custom tools and living-off-the-land techniques to move laterally through networks before deploying their ransomware payload that uses ChaCha20 encryption. The group employs double extortion tactics, stealing sensitive data before encryption and threatening to publish it on their leak site if ransom demands are not met. Notable campaigns include attacks on major manufacturing companies, healthcare organizations, and critical infrastructure entities primarily across the United States, United Kingdom, Germany, Canada, and Italy, with the group showing particular focus on business services, manufacturing, technology, agriculture and food production, and transportation/logistics sectors. As of 2024, Black Basta remains active and continues to evolve its tactics, techniques, and procedures while maintaining a steady pace of victim recruitment and ransom collection operations. The group has been linked to 523 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.

Timeline of this disclosure

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

Data size: 1.5 TB
Records: 4. Users