Hartford Mayor Luke Bronin appears with David Wessel at a Brookings Institution event two years ago. Today’s columnist, Chester Wisniewski of Sophos, lauds Mayor Bronin for not paying the ransom when schools in Hartford were hit by an attack this past fall. (Credit: CC BY-NC-ND 2.0)

Ransomware attacks are dominating the security news headlines this year, and unfortunately, there’s no sign of these targeted attacks – or the stealthy cybercriminals behind them – slowing down.

As a cybersecurity researcher who has studied these threats for more than two decades, I’ve identified a disturbing new trend in how attackers carefully select their targets and calculate the most opportune times to launch their attacks.

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