Cybersecurity Brief – 2025-12-30

Tue, 30 Dec 2025 00:00:00 +0000

Major Incidents or Breaches

Coupang, South Korea’s largest retailer, will compensate 33.7 million customers with $1.17 billion following a data breach that exposed customer information.
Aflac suffered a data breach affecting 22 million individuals, with hackers stealing names, addresses, Social Security numbers, ID numbers, and medical/health insurance information.
Sax, a major US accounting firm, disclosed a 2024 data breach impacting 220,000 individuals; the investigation took over a year.
Korean Air experienced a data breach affecting thousands of employees after its in-flight catering supplier, KC&D, was hacked.
Trust Wallet reported that attackers compromised its browser extension, draining approximately $7 million from 2,596 cryptocurrency wallets.
Romanian energy provider Oltenia Energy Complex was hit by a Gentlemen ransomware attack, disrupting its IT infrastructure.
A hacker claimed theft of 40 million Condé Nast records following a Wired data leak, with 2.3 million Wired subscriber records made public.
The EmEditor website was compromised in a supply chain attack, serving a malicious installer that delivered infostealer malware.
Over 90% of parked domains now lead users to scams or malware, a significant increase from less than 5% a decade ago.
A Lithuanian national was arrested for distributing clipboard-stealing malware disguised as KMSAuto, infecting 2.8 million systems.
A former Coinbase support agent was arrested in India for assisting hackers in stealing sensitive customer information from a company database.

Newly Discovered Vulnerabilities

MongoDB vulnerability CVE-2025-14847 (“MongoBleed”) is under active exploitation, allowing unauthenticated, remote attackers to leak sensitive data. Over 87,000 potentially vulnerable instances are exposed worldwide.
Fortinet warned that the five-year-old critical FortiOS vulnerability (CVE-2020-12812), which allows 2FA bypass, is still being actively exploited in attacks against unpatched devices.

Notable Threat Actor Activity

The HoneyMyte APT (also known as Mustang Panda or Bronze President), linked to Chinese state actors, has evolved its tactics to use a kernel-mode rootkit for delivering and protecting the ToneShell backdoor in attacks against government organisations.
Researchers disclosed a spear-phishing campaign that published over two dozen malicious npm packages, used as phishing infrastructure to steal login credentials.
Chinese state-affiliated hackers are using a kernel-mode loader to hide ToneShell malware activity during cyberespionage campaigns targeting government entities.

Trends, Tools, or Tactics of Interest

Malware in 2025 increasingly targeted platforms beyond Windows, including Android, macOS, and cross-platform environments.
OWASP’s Agentic AI Top 10 highlights real-world attacks on autonomous AI systems, including goal hijacking and malicious MCP servers.
Supply chain attacks remain prominent, as evidenced by the EmEditor installer compromise and malicious npm package campaigns.
There is a significant rise in malicious use of parked domains, now serving as a major vector for scams and malware distribution.
2025 saw a shift from singular large incidents to widespread smaller breaches and attacks, with trusted tools being abused and old vulnerabilities resurfacing.

Regulatory or Policy Developments Affecting the Security Industry

Debate continues over the utility of Software Bill of Materials (SBOMs), with industry experts expressing mixed views on their practical effectiveness as regulatory and compliance requirements evolve.

Oltenia Energy Complex on DanSec Daily

Cybersecurity Brief – 2025-12-30

Major Incidents or Breaches

Newly Discovered Vulnerabilities

Notable Threat Actor Activity

Trends, Tools, or Tactics of Interest

Regulatory or Policy Developments Affecting the Security Industry