On May 9, 2023, German tax advisory firm interfides.de appeared on the LockBit 3.0 ransomware leak site, claiming that the company had been hit by a ransomware attack in which internal files were exfiltrated.
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Reported Details from the Listing
The LockBit 3.0 leak page states that interfides Steuerberatungsgesellschaft mbH suffered a ransomware intrusion and that attackers successfully removed internal files. The disclosure does not quantify the number of records affected, list specific data types beyond “internal files,” or reveal the exact date of initial compromise. It does, however, set a public countdown for the publication of the stolen material if the company does not meet the group’s demands. interfides, founded in 1978, provides tax and business advisory services primarily to foreign clients operating in Germany; the leak therefore concerns sensitive financial, corporate, and personal tax records belonging to both the firm and its international clientele.
Why This Matters for You and Your Family
When a tax advisory company is breached, the data exposed often includes names, addresses, tax identification numbers, income details, bank account information, and correspondence that can be used for identity theft or fraudulent filings. Even though the exact volume of data is unknown, any client whose records were stored on the compromised systems now faces heightened risk of targeted phishing, loan fraud, or tax-related scams. If you or any member of your family has worked with interfides or another German tax advisor serving cross-border clients, your personal financial footprint may already be in attackers’ hands. The breach also underscores how small and mid-sized professional service firms remain high-value targets precisely because they hold concentrated, high-quality personal and corporate data.
The Doxxing and Identity-Chain Risk
Stolen internal files rarely stop at one company. Tax records frequently contain email addresses, phone numbers, client contracts, and notes that link professional identities to home addresses and family members. Once attackers possess these connections, they can chain them with other breaches to build detailed profiles. A single leaked tax document can expose not only an individual but also spouses, children, and business partners. Credential leaks tied to such incidents routinely cascade into account takeovers, including gaming accounts belonging to children that often share the same email addresses or password patterns used for adult services. The result is a widening doxxing chain that can lead to harassment, SIM-swapping, or further extortion attempts against the household.