Critical Alert – Hackers Actively Targeting Health Care Systems Nationwide

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Sikich received credible intelligence Saturday, March 21, from the Wisconsin Cyber Threat Response Alliance (WICTRA) of ongoing healthcare system attacks against IT infrastructure in the United States that has been occurring over the course of the last week. While specific details about the nature of the attacks or the threat vectors being employed in these attacks are unavailable at this time, health care organizations are strongly advised to blacklist any traffic from a list of associated IP addresses.  To receive the list, please email us at We will review email addresses before providing the list.

Organizations should also review log activity from the last week to determine if any traffic to their networks or externally facing applications has originated from these IPs. Should you identify any evidence of activity from these IPs, please provide it to WICTRA.

Should you have any questions on whitelisting/blacklisting IP addresses, these healthcare system attacks, or reviewing log activity, please don’t hesitate to contact our Cybersecurity team.

This publication contains general information only and Sikich is not, by means of this publication, rendering accounting, business, financial, investment, legal, tax, or any other professional advice or services. This publication is not a substitute for such professional advice or services, nor should you use it as a basis for any decision, action or omission that may affect you or your business. Before making any decision, taking any action or omitting an action that may affect you or your business, you should consult a qualified professional advisor. In addition, this publication may contain certain content generated by an artificial intelligence (AI) language model. You acknowledge that Sikich shall not be responsible for any loss sustained by you or any person who relies on this publication.


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