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Unicode: It is more than funny domain names., (Wed, Nov 12th)

ID: cb47c8f8-f733-5603-8189-8dce2b1605bf

STIX ID: report--cb47c8f8-f733-5603-8189-8dce2b1605bf

Feed Name: SANS ISC Diary

Date Published: 2025-11-19

Date Updated: 2026-04-19

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This report outlines Unicode-driven attack techniques that can undermine application security and code review, including visually confusable characters enabling impersonation, normalization/best-fit mappings that can bypass input filters, invisible variant selectors abused for obfuscation (e.g., the "Glass Worm" incident), and bidirectional text controls used in Trojan Source-style review evasion; it emphasizes avoiding post-validation string transformations and raising awareness of directionality controls.

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