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RomCom exploits Firefox and Windows zero days in the wild


ESET Research details the analysis of a previously unknown vulnerability in Mozilla products exploited in the wild and another previously unknown Microsoft Windows vulnerability, combined in a zero-click exploit.

Chained with another previously unknown vulnerability in Windows, assigned CVE-2024-49039 with a CVSS score of 8.8, arbitrary code can be executed in the context of the logged-in user. While we don’t know how the link to the fake website is distributed, however, if the page is reached using a vulnerable browser, a payload is dropped and executed on the victim’s computer with no user interaction required. According to our telemetry, from October 10 th, 2024 to November 4 th, 2024, potential victims who visited websites hosting the exploit were located mostly in Europe and North America, as shown in Figure 2.

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Firefox and Windows zero-days exploited by Russian RomCom hackers