Early last week, the Security Information Service (BIS), the primary domestic national intelligence agency of the Czech Republic, issued a short statementsaying that it “played a big part in helping to identify and disconnect Hezbollah servers in the Czech Republic, other EU member states and the US”. But it did not elaborate. On Tuesday, however, ZDNet’s Zero Day security blog published more information from the Czechs about the BIS operation.

According to the BIS, its cyber security force discovered a number of servers located on Czech soil, which were “almost certainly” used by Hezbollah, the Shiite militant group that controls large swathes of territory in Lebanon. The servers were allegedly used in a wide-range cyberespionage operation that began in 2017 by a group of Hezbollah hackers based in Lebanon. It was there, said the BIS, where the command-and-control facilities of the operation were located. The servers located on Czech soil were used to download phone apps that contained malicious software. The hackers targeted individual phone users located mainly in the Middle East, according to the BIS, but other targets were in eastern and central Europe. It is believed that the majority of targets were Israeli citizens. Invariably, targeted individuals were approached online, mostly through fake Facebook profiles. Most of the targets were men, and the fake Facebook profiles featured pictures of attractive young women. After initial messages were exchanged via Facebook, the targets were convinced to download phone applications that would allow them to continue communicating with the ‘women’. These applications would install spyware on their phones, thus allowing Hezbollah hackers to capture the content of messages and calls made on the phones. The latter could also be used as eavesdropping devices.

According to BIS Director Michal Koudelka, the spy agency “played a significant role in identifying and uncovering the hackers’ system. We identified the victims and traced the attack to its source facilities. Hacker servers have been shut down”, he said. Koudelka added that some of the servers used by Hezbollah were located in other European Union countries and in the United States. These were shut down following a joint cyber operation by BIS and “partners”, said Koudelka, though he did not identify them.