Eicardemo
Overview
Executive Summary
EICAR Demo (or the EICAR Standard Anti-Virus Test File) is **NOT MALWARE**. It is a safe, standardized, and internationally recognized 68-byte text file developed by the European Institute for Computer Antivirus Research (EICAR) and the Computer Antivirus Research Organization (CARO). Its sole purpose is to safely test and verify the operational status, detection capabilities, and alerting mechanisms of antivirus (AV) software, Endpoint Detection and Response (EDR) solutions, and network security appliances without exposing the network to actual malicious code.Technical Capabilities (Safe Testing)
The EICAR test file is literally a short string of printable ASCII characters (`X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*`). It contains no malicious logic, cannot self-replicate, cannot access the network, and cannot harm the system in any way. How it functions in a security context:- Standardized Signature: All legitimate, commercial antivirus vendors have explicitly programmed their scanning engines to recognize this specific 68-byte string as a "virus" for testing purposes.
- Validation of Defense in Depth: Security administrators deploy the EICAR file in various formats (e.g., plain text, compressed in a `.zip` archive, or embedded in an email) to verify that different layers of their security stack (email gateways, web proxies, endpoint AV) are functioning and successfully blocking malicious signatures.
- Alerting Verification: It is frequently used during incident response drills to verify that when an endpoint detects malware, the alert successfully traverses the network and appears correctly in the centralized Security Information and Event Management (SIEM) dashboard.
Threat Assessment
There is absolutely **ZERO THREAT** posed by the EICAR test file itself. However, if an administrator downloads the EICAR file and the local antivirus solution fails to detect it, that represents a critical security failure, indicating the AV engine is broken, disabled, or misconfigured.Incident Response and Remediation
- No Remediation Required (For the File): If the antivirus successfully detects and quarantines the EICAR file, the system is working as intended. The file can be safely deleted or left in quarantine.
- Investigate Lack of Detection: If the EICAR file is downloaded and *not* detected, immediate IT intervention is required to troubleshoot the endpoint security software and restore its protective capabilities.
Known aliases
Threat reports may refer to this family under multiple names:
Generated Detections (Boilerplate)
These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.
YARA Rule
rule MALWARE_WIN_EICARDEMO {
meta:
description = "Detects Eicardemo (advanced_threat)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "eicardemo" ascii wide nocase
$s2 = "eicar_test_file" ascii wide nocase
$s3 = "test-file.eicar" ascii wide nocase
$s4 = "not-a-virus:eicar-test-signature" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Eicardemo Activity
id: 7c2123a5bd15cfe5add07a56fc27fc14
status: experimental
description: Detects generic indicators of the eicardemo malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*eicardemo*"
- "*eicar_test_file*"
- "*test-file.eicar*"
- "*not-a-virus:eicar-test-signature*"
condition: selection
level: mediumReferences & External Analysis
- Search "eicardemo" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Eicardemo Advanced_Threat from Windows?
Manual removal of Eicardemo is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Eicardemo a virus or a Advanced_Threat?
Eicardemo is classified as a Advanced_Threat. Unlike traditional viruses that infect files, modern malware like Eicardemo typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Eicardemo infection?
Symptoms of Eicardemo can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Related Families (Category: advanced_threat)
Explore other malware families in the same category:
Protect Your Network Against Advanced_Threats
Want to prevent Eicardemo and similar threats from compromising your organization? Read our comprehensive defensive guide: Suspect an Infection? What to do.
Machine-readable
Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/eicardemo.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.