WHEN NEWS HIT earlier this week that Chinese hackers were actively targeting Microsoft Exchange servers, the cybersecurity community warned that the zero-day vulnerabilities they were exploiting might have allowed them to hit countless organizations around the world. Now it’s becoming clear just many email servers they hacked. By all appearances, the group known as Hafnium breached as many victims they could find across the global internet, leaving behind backdoors to return to later.
Hafnium has now exploited zero-day vulnerabilities in Microsoft’s Exchange servers’ Outlook Web Access to indiscriminately compromise no fewer than tens of thousands of email servers, according to sources with knowledge of the investigation into the hacking campaign who spoke to WIRED. The intrusions, first spotted by security firm Volexity, began as early as January 6, with a noticeable uptick starting last Friday and spiking early this week. The hackers appear to have responded to Microsoft’s patch, released Tuesday, by ramping up and automating their hacking campaign. One security researcher involved in the investigation who spoke to WIRED on the condition of anonymity put the number of hacked Exchange servers at more than 30,000 in the US alone, and hundreds of thousands worldwide, all apparently by the same group. Independent cybersecurity journalist Brian Krebs first reported that 30,000 figure Friday, citing sources who had briefed national security officials.