Yesterday, several articles came out through various publications regarding a piece of malware named "MacDownloader". It appears to be specifically targeting the Defense Industry. Several other research firms attribute the malware to Iranian attackers.
For more information we are publishing links to several blogs below:
https://blog.malwarebytes.com/threat-analysis/2017/02/macdownloader-malware-targeting-defense-industry/
http://www.csoonline.com/article/3167249/security/mac-malware-possibly-made-in-iran-targets-us-defense-industry.html
and finally the original blog:
https://iranthreats.github.io/resources/macdownloader-macos-malware/
Our ClamAV auto detection scripts have published detection for this already:
Osx.Downloader.MacDownloader-5781857-0
Please ensure you are scanning your machines regularly!