A North Korean cybercrime group attacked a Spanish aerospace company by targeting employees through “trojanized coding challenges,” according to a Slovakia-based cybersecurity firm.

The Lazarus Group allegedly used the social media platform LinkedIn’s built-in messaging service to deliver various payloads to targets’ systems by masquerading as a recruiter for Meta, Facebook’s parent company, ESET Security said in a report published Friday.

The firm did not provide any details about the Spanish company or how the attackers could have exploited the compromised systems, but the threat actor has previously targeted aerospace and defense companies