Quasar RAT is a .NET framework open-source remote access trojan family used in cyber-criminal and cyber-espionage campaigns to target Windows operating system devices. It is often delivered via malicious attachments in phishing and spear-phishing emails. Some of its features include:
TCP network stream
Compressed and encrypted communication
Technical Details and Reporting
GitHub provides technical details on Quasar RAT here.
US-CERT published an Analysis Report, AR18-352A, on the Quasar RAT here.
January 2017: Quasar RAT used in recent targeted attacks against governments. (Palo Alto Networks)
January 2018: Quasar RAT and custom malware used in Ukraine. (Palo Alto Networks)
August 2019: Phishing campaign delivers Quasar RAT payloads via fake resumes. (Bleeping Computer)