Loading...
Sub7
Port 27374 is notoriously associated with Sub7, a popular remote administration trojan from the late 1990s and early 2000s. Sub7 enables a malicious actor to gain covert control of infected Windows machines, allowing unauthorized access, data theft, and remote manipulation. Although its prevalence has declined, the port remains a common scan target for cybercriminals attempting to identify backdoored systems..
Sub7 (SubSeven) is a remote access trojan (RAT) historically used to exploit vulnerabilities in Windows operating systems. Once a victim mistakenly executes the malware payload, it installs itself stealthily and opens a backdoor listening on port 27374 by default. This allows attackers to bypass firewall protections and establish unauthorized remote sessions.
The Sub7 client program provides an intuitive graphical interface, enabling the attacker to execute a wide variety of malicious actions such as keystroke logging, file transfers, webcam activation, screenshot capture, and registry edits. Its modular architecture and plugin support further expanded its capabilities, making it a versatile but dangerous tool.
Over time, variants of Sub7 introduced evasion techniques including polymorphic code and encryption of traffic, complicating network detection. However, modern antivirus solutions and Windows security enhancements have reduced the effectiveness of classic Sub7 strains, even though port 27374 continues to be probed by attackers looking for old infections.