Researchers detail how LightNeuron, a backdoor used by espionage group Turla, has been specifically targeting Microsoft Exchange mail servers since 2014 (Matthieu Faou/WeLiveSecurity)

Matthieu Faou / WeLiveSecurity:
Researchers detail how LightNeuron, a backdoor used by espionage group Turla, has been specifically targeting Microsoft Exchange mail servers since 2014  —  ESET research uncovers Microsoft Exchange malware remotely controlled via steganographic PDF and JPG email attachments