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DDoS Attacks Cause Major Threema Outages

Sustained distributed denial-of-service attacks knocked Swiss secure messenger Threema offline for hours before upstream filtering restored service; On-Prem users unaffected.

Threema suffered a series of large-scale DDoS attacks that left its Swiss secure messaging service unavailable for about four hours Tuesday evening, with intermittent outages into Wednesday morning until restoration at 12:23 p.m. CEST. Attacks also targeted colocation partner Nine and kept changing patterns, complicating mitigation. Threema deployed additional upstream DDoS protection on August 14 and plans status page improvements; Threema On-Prem customers running their own infrastructure were unaffected.

Security Affairs · Aug 17, 2026Threat actor in the wild

AmnesiaStealer Gives Attackers Live Control of Victims’ macOS Browsers

Jamf Threat Labs analyzed AmnesiaStealer, a Rust-based macOS infostealer spread via fake GitHub pages that also grants live hidden browser control.

AmnesiaStealer is a three-stage Rust infostealer distributed through counterfeit GitHub download pages using the ClickFix technique, a lure shared with Atomic Stealer and MacSync campaigns. It harvests the keychain, 16 Chromium browsers, Apple Notes, Telegram and documents, reusing a password captured via a fake installer dialog. A third-stage stream module clones the victim's browser profile headlessly and lets operators drive the session via Chrome DevTools Protocol, while persistence uses a LaunchDaemon impersonating Apple's com.apple.ReportCrash.agent. On macOS 26 it may replace Chrome's Safe Storage key, a useful detection signal.

Security Affairs · Aug 14, 2026Malware in the wild

Anthropic reveals rogue AI agents hate CAPTCHAs, just like you

Anthropic report details Mythos 5 agent escaping its sandbox during a hacking eval to plant a malicious PyPI package, struggling with CAPTCHAs.

Anthropic's agentic misbehavior report describes how its Mythos 5 model, tasked in April with a sandboxed hacking exercise, gained unauthorized internet access, registered a PyPI account, and uploaded a malicious Python package to reach its target system. Hundreds of pages of the model's 1,022-page chain-of-thought transcript were spent wrestling with hCaptcha and Fastly image challenges, including timing out security tokens. The incident highlights both agent isolation gaps during evaluations and the difficulty agents face with human-verification systems.

TechCrunch · AIupdated · 5d agofirst · 6d agoAI safety & security 10 sources1