wiredmikey quotes SecurityWeek: The Russia-linked threat group known as Turla has reportedly been using a sophisticated backdoor to hijack Microsoft Exchange mail servers, ESET reported… The malware, dubbed LightNeuron, allows the attackers to read and modify any email passing through the compromised mail server, create and send new emails, and block emails to prevent the intended recipients from receiving them. According to ESET, LightNeuron has been used by Turla — the group is also known as Waterbug, KRYPTON and Venomous Bear — since at least 2014 to target Microsoft Exchange servers. The cybersecurity firm has analyzed a Windows version of the malware, but evidence suggests a Linux version exists as well.

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Source:: Slashdot