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Phishing Campaign Sends Millions of Emails Using Invisible Unicode to Evade Filters
Microsoft warns of a high-volume phishing campaign using invisible Unicode characters to split keywords like 'funding' and evade filters, peaking at 2.37 million daily messages.
Microsoft's Security Research team documented a high-volume phishing operation inserting deprecated Unicode Tags characters (U+E0000-U+E007F) inside financial keywords such as 'funding' so literal-string and regex email filters stop matching them. The campaign ran on a weekly cadence with 1-2.37 million weekday messages between February and May 15, 2026, peaking on February 26, 2026. It used hundreds of disposable finance-themed sender domains and relayed mail through ActiveCampaign's click-tracking infrastructure (acemlnd[.]com, activehosted[.]com), lending legitimate platform reputation. Microsoft ties the activity to an AI-assisted SBA loan phishing campaign that Fortra's FIRE team disclosed in September 2025.
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Week in review: Windows kernel flaw patched, suspected Fortinet FortiWeb zero-day exploited
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Week in review: cPanel vulnerability actively exploited, DigiCert breach, LinkedIn job scams
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⚡ THN Weekly Recap: Top Cybersecurity Threats, Tools and Tips
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⚡ Weekly Recap: SD-WAN 0-Day, Critical CVEs, Telegram Probe, Smart TV Proxy SDK and More
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September 2026 Patch Tuesday: Record patch count, 2 zero-days, and a SigRed successor
Microsoft's September 2026 Patch Tuesday delivers a record patch count, fixing two exploited zero-days and a wormable DNS flaw dubbed a SigRed successor.
Microsoft's September 2026 Patch Tuesday sets another record patch count, fixing two vulnerabilities exploited as zero-days: CVE-2026-81963, a Windows Update Stack low-privilege-to-SYSTEM escalation reported by MSTIC, and CVE-2026-85880, a Windows Advanced Local Procedure Call escalation reported by Proofpoint. Zero Day Initiative's Dustin Childs urges priority on a cluster of 20 potentially wormable bugs including DNS RCE CVE-2026-69730, described as a spiritual successor to SigRed, plus Kerberos authentication bypass CVE-2026-69676 that could give any authenticated domain user RCE on domain controllers, and Exchange RCE CVE-2026-55007 via a malicious Visio attachment. All Windows fixes are bundled in cumulative updates, and experts stress prioritizing exploitable, reachable flaws over raw patch counts.
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THN Cybersecurity Recap: Top Threats, Tools and News (Oct 21
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⚡ Weekly Recap: BadCam Attack, WinRAR 0-Day, EDR Killer, NVIDIA Flaws, Ransomware Attacks & More
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Week in review: Axios npm supply chain compromise, critical FortiClient EMS bugs exploited
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Week in review: ServiceNow pre-auth RCE exploited in the wild, Hugging Face breached
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Week in review: AiTM phishing kit used to hijack AWS accounts, year-long malware campaign targets HR
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⚡ THN Weekly Recap: Top Cybersecurity Threats, Tools and Tips [3 February]
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