While many of the capabilities of this malware framework are rather typical, this “Radio Silence” mode is somewhat novel and is not seen displayed by many malware implants. Many times, malware in an environment can be identified through abnormal communications, such as a large number of connections from a host over the weekend that is typically dormant. With this feature, however, the operators can pick and choose when they want their communications to be sent, allowing them to better blend in with typical traffic. This new malware variant demonstrates a need for a defense-in-depth strategy, which is needed to detect this malware at a different point of its infection chain.
Source
https://www.bleepingcomputer.com/news/security/new-malware-variant-has-radio-silence-mode-to-evade-detection/
