The accounts were used to catfish security researchers into downloading malware in a long-running cyber-espionage campaign attributed to North Korea.
https://threatpost.com/twitter-suspends-security-researchers/175524/
‘Karakurt’ Extortion Threat Emerges, But Says No to Ransomware
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The threat group, first identified in June, focuses solely on data exfiltration and subsequent extortion, and has already targeted 40 victims since September.
https://threatpost.com/extortion-karakurt-threat-ransomware/176911/