The botnet was active just days after the Exchange Server vulnerabilities were announced.

It's a twist on the Arabic-speaking hacking group's tradecraft.

Three groups targeted seven prominent companies in Canada, France, India, South Korea and the United States, Microsoft said.

Researchers say they combined government data with their own findings to identify previously undocumented spyware.

With an effective mobile malware kit written, hackers can tweak the code to target different parts of the world.

More than just a “loader” that delivers malicious code, Valak can also be used to siphon off data from enterprise networks.