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DETECTION OVERVIEW

External EICAR Test File Transfer

Risk Factors

The European Institute for Computer Antivirus Research (EICAR) test file is an industry standard for validating security controls. This file is designed for testing purposes only and presents a low risk to network environments.

Kill Chain

Command-and-Control

Risk Score

33

Detection diagram
Next in Command-and-Control: HTTP Tunnel

Attack Background

The EICAR file is designed to test the capabilities of security controls, such as antivirus software. To initiate the test, clients upload or download the EICAR test file from an external endpoint over a common protocol such as HTTP.

Unexpected file transfers from an external endpoint should be investigated. Attackers often transfer malware from an external system into a compromised environment through a command-and-control channel or common protocol.

Mitigation Options

Monitor and investigate unusual activity to minimize potential damage
Filter ingress traffic at the network perimeter

MITRE ATT&CK ID

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