DETECTION OVERVIEW
Risk Factors
Attackers often establish command-and-control (C&C) channels through SSH tunneling to maintain control of a compromised device. The presence of a C&C channel on your network indicates that an attacker might be conducting a persistent attack. The ultimate objective of a persistent attack, such as data exfiltration, could have a significant impact on a business or organization.
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Category
After an attacker installs malware on a victim, the malware might establish or accept an SSH connection from a C&C server, enabling the attacker to securely send malicious commands to the victim.
Because IT administrators often remotely manage devices through a shell, investigate to confirm that the shell activity is legitimate.
Configure firewalls to block outbound traffic to suspicious external hosts
Remove or prohibit unnecessary network utilities that enable users to easily create shells for most programming languages
Provision devices to communicate over authorized interfaces
Review access controls to ensure that only necessary users can connect to remote access services
Implement network segmentation and firewall policies to limit how devices can communicate and enforce security zones
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This analysis exposes the critical link between an organization's lack of internal visibility and the escalating cost of compromise, demanding an urgent re-evaluation of how core business assets are protected.
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