Information about cyber attack against Indian Central Bureau of Investigation (CBI) and Indian army officials

IDSA (Institute for Defence Studies and Analyses) is an Indian think tank for advanced research in international relations, especially strategic and security issues, and also trains civilian and military officers of the Government of
India and deals with objective research and policy relating to all aspects of defense and National security.
The Central Bureau of Investigation (CBI) is the domestic intelligence and security service of India and serves as the India’s premier investigative and Interpol agency operating under the jurisdiction of the Government of India.
In order to infect the victims, the attackers distributed spear-phishing emails containing malicious excel file which when opened dropped a malware capable of downloading additional components and spying on infected systems. To distribute the malicious excel file, the attackers registered a domain which impersonated the identity of most influential Indian think tank IDSA (Institute for Defence Studies and Analyses) and used the email id from the impersonating domain to send out the spear-phishing emails to the victims.