Latest cybersecurity reporting from selected sources.

Threat Actor Maintains Long-Term Stealthy AccessChinese nation-state hackers penetrated mobile telecom networks across Southeast Asia likely in order to track individuals' location, say security researchers. One tell about the hackers' intentions was deployment of a custom-made network scanning and packet capture utility tracked as CordScan.

Attorney General Accuses Telecom of Failing to Correctly Notify Millions of VictimsWashington state's attorney general filed a consumer protection lawsuit against T-Mobile over a massive 2021 data breach that exposed personally identifiable information for more than 79 million consumers, alleging in part the telecom failed to correctly notify victims.

T-Mobile Blocks Hackers But Warns Other U.S. Networks May Be CompromisedT-Mobile disputed claims Wednesday that Chinese state-sponsored hackers breached its systems and stole customer data, warning that some U.S. communications networks may still be compromised and detailing how its layered defenses and third-party cybersecurity partnerships thwarted the attack.

Telco Giant's Probe Finds 'No Evidence' of Customer or Sensitive Data BreachThe world's largest telecommunications carrier, T-Mobile U.S., said it was targeted as part of a wide-ranging cyberespionage operation the U.S. government attributes to China but has found no sign of data access or theft. Other known victims of the campaign include AT&T, Verizon and Lumen.

CyberEspionage 'Salt Typhoon' Operation Infiltrated Telcos' InfrastructureThe impact of a major U.S. national security breach attributed to China reportedly continues to expand, as investigators probe the infiltration of telecommunications infrastructure and eavesdropping on national security and policymaking officials' mobile phone communications.

Incident Involves Health Plans' Prior Use of Online Tech in Websites, Mobile AppsKaiser Foundation Health Plan has reported to regulators a health data breach affecting 13.4 million people stemming from the previous use of web trackers. Aside from reports expected from the Change Healthcare mega hack, the incident is the largest health data breach reported so far in 2024.

Customer Accounts Were Secured by MFA, But Contractor's Credentials Exposed DataAustralian telecom company Tangerine is blaming the compromise of a third-party contractor's credentials for exposing personal information of 232,000 customers, which had been stored in a legacy database. The breach exposed customers' names, birthdates, mobile numbers, addresses and account numbers.

Hackers Spread Fake News About SEC Approving Spot Bitcoin Exchange-Traded FundIt wasn't a sophisticated hack on Jan. 9 that allowed hackers to briefly take control of an official U.S. Securities and Exchange Commission social media account, the agency said Monday. The hackers simply scammed the account's mobile phone provider in a SIM swap attack.