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DETECTION OVERVIEW

Internal 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

Lateral Movement

Risk Score

33

Detection diagram
Next in Lateral Movement: Kerberos Attack Tool Activity

Attack Background

The EICAR file is designed to test the detection capabilities of security controls, such as antivirus software. To initiate the test, clients send or receive the EICAR test file from an internal device over common protocols such as HTTP, SMB, or FTP.

Unexpected file transfers from an internal device should be investigated. Attackers often transfer malware between compromised devices to support lateral movement during an attack campaign.

Mitigation Options

Monitor and investigate unusual activity to minimize potential damage
Enforce security zones by implementing network segmentation and firewall policies to limit how devices can communicate

MITRE ATT&CK ID

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