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Thursday, 04 March 2021 08:28

ESET says more threat groups using Microsoft zero-days in attacks Featured

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ESET says more threat groups using Microsoft zero-days in attacks Image by Gerd Altmann from Pixabay

Slovakian security firm ESET says it has detected at least three additional threat groups using a zero-day in Microsoft Exchange Server in attacks, even as the US Government issued an emergency directive telling all US federal bodies to patch Exchange and report on exploitation by noon on Friday.

ESET said in a series of tweets that CVE-2021-26855 was being actively exploited in the wild by several groups.

"Among them, we identified #LuckyMouse, #Tick, #Calypso and a few additional yet-unclassified clusters," it added.

The security firm said most targets of the attacks were located in the US, "but we’ve seen attacks against servers in Europe, Asia and the Middle East. Targeted verticals include governments, law firms, private companies and medical facilities".

Microsoft warned on Wednesday AEDT that four zero-day exploits are being used to attack versions of Microsoft Exchange Server on-premise.

The US directive, from the Department of Homeland Security, said partners of the Cybersecurity and Infrastructure Security Agency had observed active exploitation of the four vulnerabilities.

"Successful exploitation of these vulnerabilities allows an attacker to access on-premises Exchange Servers, enabling them to gain persistent system access and control of an enterprise network," the directive said.

The DHS said if no hint of compromise was found, then the patches issued by Microsoft should be immediately applied.

Those who did find breaches were told to image system memory for later analysis.


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Sam Varghese

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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