EICAR test file write

eicar_file_write

Writes the standard 68-byte EICAR anti-malware test file into the sandbox and re-checks it for several seconds to catch asynchronous quarantine.

Severity low how bad it would be if it were real

Expected outcome Something should notice

Platforms 3 macOS, Linux, Windows

Isolation subprocess runs in its own process, so a kill is a measurement

What it needs before it will run

runs in --safe
Observation only. It runs even in the inert mode, because it changes nothing and sends nothing.

Gates are cumulative and none of them is implied by another: see the three gates for why they are separate decisions.

ATT&CK techniques it exercises

MITRE ATT&CK techniques this test maps to.
Technique	Name	Tactic	Across public reports
T1204.002	Malicious File	Execution	coverage statistics

How often anything notices

Not enough data: fewer than 3 public reports have run this test, so no rate is published for it. Groups below that threshold are withheld everywhere on the site — with one or two contributors an average is one organisation's result with a percent sign after it.

Other antivirus signatures tests

Other tests in the Antivirus signatures category.
Test	What it does	Severity
Macro-bearing document shapes macro_document_shapes	Writes the document shapes phishing campaigns use — a macro-enabled OOXML package with a vbaProject part, an HTA script, a Windows script file and a s…	medium
EICAR download over HTTPS eicar_download	Fetches the EICAR test file from the official eicar.org endpoints (an AMTSO test resource) to observe whether the download path — proxy, TLS inspectio…	low
EICAR variant battery eicar_variant_battery	Writes six on-disk shapes of the EICAR test file (plain, double extension, padded, prefixed, zipped, nested zip) to compare how deeply the scanner ins…	low

the whole catalogue this test in the list run it yourself

Catalogue generated from client 0.1.0. A test's behaviour can change between releases; this page describes the version named here.