MALWARE-CNC -- Snort has detected a Comand and Control (CNC) rule violation, most likely for commands and calls for files or other stages from the control server. The alert indicates a host has been infiltrated by an attacker, who is using the host to make calls for files, as a call-home vector for other malware-infected networks, for shuttling traffic back to bot owners, etc.
This rule alerts on network communications from the Earthworm network proxy
tool. This rule may alert on any of the subcommands involved in the
client-server handshake of custom TCP protocol used by Earthworm, including the
establishment of a reverse socks5 tunnel from the server to the client.
What To Look For
This rule alerts on network communications from the Earthworm network proxy tool.
Known Usage
Attacks/Scans seen in the wild
False Positives
No known false positives
Contributors
Cisco Talos Intelligence Group
Rule Groups
MITRE::ATT&CK Framework::Enterprise::Command and Control::Application Layer Protocol
Adversaries may communicate using application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
