Threat IntelligenceBleeping Computer
8.0 — CRITICAL
Attackers conceal phishing lures using invisible Unicode characters
Threat actors have adopted the ASCII smuggling technique in phishing campaigns, using invisible Unicode characters to evade email security filters. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Threat actors used ASCII smuggling technique in phishing campaigns, evading email security filters by inserting invisible Unicode characters into finance-related lure words. The campaign peaked at up to 2.37 million daily messages in late February.
⚙️Technical Details
Affected Systems
ActiveCampaign email-marketing platformMicrosoft Office 365
Attack Vectors
Phishing emails with invisible Unicode charactersAI prompt injection attacks
💥Impact Assessment
Severity: high
Who Is at Risk
Finance and business professionals using Microsoft Office 365
🛡️Recommended Actions
1Strip or normalize Unicode tag characters before applying keyword, regex, or signature-based detection
2Treat unexpected tag-block characters as a strong anomaly
3Apply normalization before passing email content to AI assistants
📦Affected Products
ActiveCampaignMicrosoft Office 365
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