AnalysisCybersecuritySeptember 4, 2026

ASCII smuggling, once an AI attack, now used by spammers

Microsoft Defender for Office saw ASCII smuggling signatures spike from ~21,000 to 1.3 million per day in early February, peaking at 2.5 million within four days. The technique, which hides text in invisible Unicode tags, is now used to evade email spam filters.

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