{"id":533,"date":"2026-01-11T12:04:12","date_gmt":"2026-01-11T12:04:12","guid":{"rendered":"https:\/\/blog.ibvl.in\/index.php\/2026\/01\/11\/yara-x-1-11-0-release-hash-function-warnings-sun-jan-11th\/"},"modified":"2026-01-11T12:04:12","modified_gmt":"2026-01-11T12:04:12","slug":"yara-x-1-11-0-release-hash-function-warnings-sun-jan-11th","status":"publish","type":"post","link":"https:\/\/blog.ibvl.in\/index.php\/2026\/01\/11\/yara-x-1-11-0-release-hash-function-warnings-sun-jan-11th\/","title":{"rendered":"YARA-X 1.11.0 Release: Hash Function Warnings, (Sun, Jan 11th)"},"content":{"rendered":"
\n

YARA-X’s 1.11.0<\/a> release brings a new feature: hash function warnings.<\/p>\n

When you write a YARA rule to match a cryptographic hash (either the full file content or a part of it), what’s actually going on are string comparisons:<\/p>\n

\"\"<\/p>\n

Function hash.sha256 returns a string (the hexadecimal SHA256 hash it calculated) and that is compared to a literal string that is the hash you want to find.<\/p>\n

If you make a mistake in your literal string hash (for example: unintentionally add an extra space), then the match will fail.<\/p>\n

But YARA-X will now show a warning like this:<\/p>\n

\"\"<\/p>\n

Another example is where you mixup hashes: you provide a SHA1 literal string hash, and it should be a SHA256.<\/p>\n

\u00a0<\/p>\n

Didier Stevens
\nSenior handler
\nblog.DidierStevens.com<\/a><\/p>\n

(c) SANS Internet Storm Center. https:\/\/isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

YARA-X’s 1.11.0 release brings a new feature: hash function warnings. When you write a YARA rule to match a cryptographic hash (either the full file content or a part of it), what’s actually going on are string comparisons: Function hash.sha256 returns a string (the hexadecimal SHA256 hash it calculated) and that is compared to a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[90],"tags":[91],"class_list":["post-533","post","type-post","status-publish","format-standard","hentry","category-cybersecurity","tag-cybersecurity"],"yoast_head":"\nYARA-X 1.11.0 Release: Hash Function Warnings, (Sun, Jan 11th) - Imperative Business Ventures Limited<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.ibvl.in\/index.php\/2026\/01\/11\/yara-x-1-11-0-release-hash-function-warnings-sun-jan-11th\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"YARA-X 1.11.0 Release: Hash Function Warnings, (Sun, Jan 11th) - Imperative Business Ventures Limited\" \/>\n<meta property=\"og:description\" content=\"YARA-X’s 1.11.0 release brings a new feature: hash function warnings. 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