Russian hackers noticed after being undetected for years

Cyber-espionage operations
from Cozy Bear, a threat actor believed to work for the Russian government,
continued undetected for the past years by using malware families previously
unknown to security researchers. Relying on stealthy communication techniques
between infected systems and the command and control (C2) servers, the group
managed to keep their activity under the radar for a long time.

Source: Bleeping Computer

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