According to information reported [Russian] by national newspaper Kommersant, the head of investigations at the multinational cybersecurity provider has been in pre-trial detention, alongside an official from Russia's Federal Security Service (FSB), since December 2016.
Prominent Russian cybersecurity company Kaspersky Lab says a manager who headed its investigation unit has been arrested.
"This case is not related to Kaspersky Lab", a company spokesperson said in an emailed statement. We do not possess details of the investigation.
In the past several years, Kaspersky Lab's Investigations of Computer Incidents Department has collaborated closely with the FSB and the Interior Ministry on investigating cyber crimes by providing expert support on such criminal cases.
It is unclear at this point if there's any connection between the arrest of Stoyanov and the FSB agent Sergei Mikhailov.
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Stoyanov, an employee at Kaspersky since 2012, is an incident response specialist with particular expertise in distributed denial of service (DDoS) attacks.
A cybersecurity researcher that heads antivirus firm Kaspersky Lab's investigation unit has been arrested in Russian Federation on charges of treason. All three involved financially motivated crime conducted inside of Russian Federation.
A much more chilling scenario, offered in this post from Lawfare Blog, is that Stoyanov was a source for U.S. intelligence officers who ultimately concluded Russian-sponsored hacking attempted to interfere with the 2016 USA presidential election. Both face charges of treason.
"Addressing cybercrime effectively is impossible without collaboration between companies working in computer security and law enforcement", the Kaspersky Lab representative said.
The most interesting part of this arrest is that Stoyanov is being accused of treason, which isn't a light allegation. In a message to Ars, he added: "I think that these charges will cause security researchers, particularly those in states with oppressive governments, to carefully consider the weight of reporting details of security incidents".