Data leakage from the servers and computers of the Russian Federal Space Agency Roscosmos is not possible, a source in Roscosmos told RIA Novosti Tuesday.

On Monday, the Moscow-based Kaspersky Lab security experts said they discovered malware placed on high-value computer hard drives in over 30 countries.

"The information security system in the rocket-space industry is formed in a way, which excludes the possibility of access to the Internet from computers containing classified data," the source said.

Most strategic establishments in Iran and Russia have been targeted, Kaspersky Labs said. Specifically, the malware was found in the databases of Russia's aerospace companies, energy and infrastructure facilities and government institutions.

Whistleblower Edward Snowden has attributed the malware, as well as an illegal mass surveillance program, to the US NSA.