Of all the databases a wealth haven would least like to lose, this one is near the top. A cyberattack has reached the data of about 31,000 people in Liechtenstein’s register of the individuals behind its companies, foundations and trusts. The government disclosed the breach on Monday.

Intruders reached the “register of economic beneficiaries” overnight from Wednesday into Thursday last week, the Associated Press reported. Officials noticed on Thursday, moved to secure the data and took the system offline. So far, they say, no one altered or deleted anything.

Why this list matters

This is not a routine customer database.

A beneficial-ownership register names the people who ultimately control a company or foundation, the humans behind the paperwork. Countries keep these lists precisely to fight money laundering and terror financing. A break-in hands whoever did it a map of who really sits behind the structures.

The scale is the tell. Liechtenstein is a country of 40,000 people wedged between Switzerland and Austria, with finance at the centre of its economy. That 31,000 names sit on the register says most of them belong to outsiders who use its vehicles. It is a compact who’s-who of hidden wealth, and it is exactly the sort of data that criminals and intelligence services prize.

The government set up a crisis unit over the weekend to investigate. It has not named a suspect or said how the intruders got in, and there is no word of a public leak. It fits a run of attacks on the state registries and utilities that hold a society’s most sensitive records.

For a jurisdiction whose product is discretion, the damage is less about deletion than exposure. The files appear intact. The secret they were built to keep may not be. A register meant to show hidden ownership to regulators has, for a night at least, shown it to someone else. That is the kind of breach you cannot take back.

Get the TNW newsletter

Get the most important tech news in your inbox each week.