Cybercriminals Exploit Microsoft Teams to Deploy EtherRAT Malware
In July 2026, threat actors initiated a sophisticated phishing campaign targeting corporate employees by impersonating IT support staff via Microsoft Teams voice calls. The attack began with phishing emails containing malicious PDF attachments labeled as 'Employee Survey.' Shortly after opening the document, victims received Teams calls from external accounts posing as system administrators. Exploiting Teams' screen-sharing feature, attackers convinced employees to install legitimate remote-access tools like HopToDesk and AnyDesk. Subsequently, they deployed a malicious MSI installer that downloaded and executed EtherRAT, a cross-platform remote access trojan written in Node.js, granting full control over compromised systems. EtherRAT enables attackers to execute commands, manipulate files, steal data, and maintain persistence, utilizing Ethereum smart contracts to retrieve its command-and-control server, complicating disruption efforts. This campaign underscores the evolving tactics of cybercriminals leveraging trusted communication platforms to infiltrate corporate networks. Organizations must enhance their security awareness training, implement robust authentication measures, and monitor for unusual activities within collaboration tools to mitigate such threats.
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