📰 Cyber Threat Pulse – Weekly Newsletter (July 15–21, 2025)

Subject:

🚨 Top Cyber Incidents of the Week | SharePoint Ransomware, Chrome 0‑Day & More

🧠 Headline Highlights

1. 🔐 Microsoft SharePoint Zero-Day Under Active Exploitation

A critical zero-day (ToolShell vulnerabilities CVE‑2025‑53770, 53771) has led to ransomware deployment across U.S. federal agencies and private firms. Threat actors Storm‑2603, Linen Typhoon, and Violet Typhoon are distributing Warlock and LockBit ransomware via SharePoint servers. Microsoft issued emergency patches, but full mitigation requires key rotation, endpoint scanning, and server isolation.Reddit+15IT Pro+15Tom's Hardware+15

2. 🌐 Qantas Data Breach Hits 6 Million Customers

Qantas disclosed a breach via an offshore call-center platform, compromising personal data of 6M customers (names, birthdates, loyalty numbers). Stolen data excluded payment or credential information. Attack attributed to Scattered Spider’s SIM‑swap social engineering.Boston Institute of Analytics+5Acronis+5Boston Institute of Analytics+5

3. 🛠️ Chrome V8 Zero-Day Patched (CVE‑2025‑6554)

An actively exploited type confusion flaw in Chrome's V8 engine allowed arbitrary memory access via malicious HTML. CISA included it in the KEV catalog—immediate patching across all Chromium browsers is strongly recommended.Acronis

4. 🇨🇸 Romanian Gang Arrested for HMRC Tax Scam (£47M Fraud)

Romanian authorities arrested 13 individuals involved in crafting fake HMRC tax refund claims. The scam targeted 100,000 UK citizens, resulting in £47M in fraudulent payouts.Cyber News Centre+1Cyber News Centre+1

5. 💉 Texas Medical Center Breach Exposes 41,000+ Patient Records

Texas Digestive Specialists suffered a ransomware breach reportedly by InterLock gang, exposing personal and medical data of ~41,500 patients. Impacted individuals have been offered credit monitoring.mysanantonio.com+1en.wikipedia.org+1

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📊 Infographic: Top Cyber Incidents (July 15–21, 2025)

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Headline: Major Cyber Threats This Week

1. 🔐 SharePoint Zero‑Day Ransomware
   • Targets: Government + Enterprise
   • Impact: Remote code execution + ransomware
2. 🌐 Qantas Customer Data Breach (6M)
   • Cause: Call-center phishing & SIM swap
   • Exposure: Personal + frequent-flyer info
3. 🛠️ Chrome V8 Zero-Day Exploit
   • Attack Vector: Malicious HTML
   • Platforms: All Chrome-based browsers
4. 🇬🇧 HMRC Tax Fraud Scam
   • Method: Phishing + false claims
   • Loss: £47M across 100k victims
5. 💉 Texas Clinic Breach
   • Threat: InterLock ransomware
   • Victims: 41K patients’ medical data exposed

Quick-defense checklist (icons):

• Patch SharePoint, Chrome
• Enable AMSI protection
• Strengthen MFA (app/bio over SMS)
• Audit remote help-desk workflows
• Monitor social fraud attempts
• Offer identity protection after breaches

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