What is Remcos?
Remcos (S0332) is a commercial Remote Access Trojan (RAT) used by cybercriminals for data theft and system control. Often delivered via phishing, it gives an attacker full, covert control over a victim’s computer.
Once installed, Remcos connects to a command-and-control (C2) server, allowing the attacker to record keystrokes, steal credentials, and download additional malware. It effectively turns the infected machine into part of a botnet.
How to Defend Against Remcos?
Defending against Remcos requires a focus on preventing its initial delivery and detecting its C2 communications.
- Be vigilant when opening email attachments, as phishing is the primary delivery vector for this RAT.
- Keep all operating systems and software patched to limit the vulnerabilities that can be exploited for initial access.
- Deploy endpoint detection and antivirus to identify and block the execution of known RATs and their associated behaviors.
- Use network detection (NDR) with integrated threat intelligence to spot and block Remcos’s C2 server communications.
