Cybersecurity Brief – 2025-11-28
Major Incidents or Breaches
- OpenAI disclosed a data breach affecting ChatGPT API customers, resulting from a compromise at third-party analytics provider Mixpanel. Limited identifying information of API customers was exposed. Multiple Mixpanel customers were impacted by the incident.
- Asahi, a Japanese company, suffered a ransomware attack that resulted in the theft of personal information of customers and employees, impacting approximately 2 million individuals and significantly disrupting operations.
- The CodeRED emergency alert system in the US experienced a ransomware attack, leading to a nationwide outage and a data breach, putting millions at risk.
- Amazon and the FBI have issued warnings regarding a surge in account takeover attacks targeting holiday shoppers, with scammers impersonating brands to gain access to user accounts.
Notable Threat Actor Activity
- The APT group Tomiris has adopted new tools and techniques, including multi-language reverse shells and the use of open-source frameworks Havoc and AdaptixC2. The group has also been observed using Discord and Telegram for command and control communications.
- Bloody Wolf, a threat actor, has expanded its campaign targeting Kyrgyzstan and Uzbekistan, delivering NetSupport RAT via Java-based attacks since at least June 2025.
Trends, Tools, or Tactics of Interest
- Increased use of open-source command and control frameworks (Havoc, AdaptixC2) and mainstream messaging platforms (Discord, Telegram) for malicious communications by APT groups.
- Growing prevalence of AI-powered malware, voice phishing (vishing) campaigns, and scams leveraging advanced technologies, as highlighted in recent threat bulletins.
- Rise in attacks exploiting digital trust, including brand impersonation and account takeover targeting consumers during high-activity periods such as holidays.
Regulatory or Policy Developments
- Microsoft has announced a 2026 update to Entra ID’s Content Security Policy that will block unauthorized script injection attacks during authentication, aiming to strengthen login security.