yara rule tester — free browser tool | fatcousin

paste a yara rule · drop a file · see matches · strings · hex · condition trace · educational subset · runs locally

library

example rules

engine subset: text · hex · regex (i / s flags) · operators $ # @ ! · at · in (…) · filesize · entrypoint — educational engine, not libyara.

rule

sample bytes

Drop any file to scan (bytes only)

decoded as raw octets — no upload

Select file

active buffer · example payload · PE MZ stub · 36 bytes