On March 12, 2024, the Canadian engineering and construction firm Kelson.on.ca appeared on the leak site operated by the cactus Ransomware Group. The listing states that internal files were exfiltrated during a ransomware attack and includes a direct link to a proof package hosted on the group’s onion domain. Anyone whose personal or employment records passed through Kelson’s systems is now at risk of exposure.
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Details in the Leak-Site Listing
The cactus leak site explicitly lists Accounting\payroll documents, Personal Identifying information, Engineering\QA data, projects and confidential design documents, contracts, tenders, various customer data, employees and executive managers personal folders, and database exports. The disclosure does not quantify how many records were taken or name individual victims, but the breadth of categories makes it clear that both corporate secrets and people’s private details were removed. A mirror link remains active on the onion address cactus5dqnqkppa5ayckiyk6dttpqwczdqphv5mxh4dkk5ct544q5aad.onion/KELSON/PROOF, claiming the data was published for anyone able to reach the dark web.
Why This Matters for You and Your Family
If you or a family member ever worked at Kelson, supplied services to them, or had personal information stored in their payroll, HR, or customer systems, your data may now be in the hands of extortionists. Personal Identifying information and employee personal folders can contain Social Insurance Numbers, home addresses, dates of birth, and direct-deposit banking details. Once these records circulate, they fuel identity theft, loan fraud, and targeted phishing that can affect your household for years. Even if you were only a customer or contractor, your contracts, contact details, and project files may now be used to impersonate you or pressure you into paying to keep them private.
The Doxxing and Identity-Chain Risk
Ransomware groups rarely stop at one leak. The files described include employee managers’ personal folders alongside customer data and engineering documents. This combination lets attackers map names to home addresses, phone numbers, email accounts, and even children’s school or sports records. A single exposed email can lead to credential-stuffing attacks on personal banking, social media, and gaming logins. When those accounts are hijacked, the chain continues: attackers post doxxing packages that link real identities to usernames, photos, and family relationships. Gaming accounts belonging to you or your children are especially vulnerable because kids often reuse passwords or email addresses that appear in parent-company breaches like this one.