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Infosec · Wednesday, 12 August 2026 · Issue 72 · 5 stories

LLM API flaw lets cheap models read premium secrets

Vulnerabilities & Exploits

LLM API flaw lets cheap models read premium models’ hidden reasoning, exposing credentials

Researchers show that encrypted chain‑of‑thought blocks returned by OpenAI, Anthropic and Google can be replayed into weaker sibling models, which then decode and print the original reasoning in plaintext. The attack extracts private data, including 182 leaked credentials and 367 PII items, from public logs and bypasses anti‑distillation safeguards. Mitigations are proposed.

arxiv.org ↗79 min read at source

Threats & Malware

Aeternum Moves C2 to Polygon Blockchain, Outsmarting Takedowns

Unit 42 uncovered Aeternum, a C++ loader that stores encrypted C2 commands in Polygon smart contracts and pulls them via public RPC endpoints. By moving the entire command channel on‑chain, the botnet sidesteps traditional domain‑based takedowns and forces defenders to monitor blockchain traffic. The finding forces security teams to add blockchain‑awareness to their detection playbooks.

Sandworm lures IT admins with trojanized WireGuard VPN

Sandworm’s UAC‑0145 cluster pretends to recruit system admins, moving conversations to Telegram and Zoom before sending a tampered WireGuard client. The client decodes a hidden AES key, runs a PowerShell script that creates a scheduled task and pulls a second‑stage payload, turning a fake VPN test into a malware drop.

gbhackers.com ↗2 min read at source

CAV3RN adopts Google Apps Script relay and DNS‑based channel switching

The article reveals that the espionage framework CAV3RN now uses a .NET NativeAOT DLL that can pick between direct HTTPS and a Google Apps Script relay based on DNS A‑record responses, allowing operators to rotate channels and hide traffic in legitimate Google services. This modular C2 design complicates detection and shows the group’s focus on Israeli targets.

securelist.com ↗8 min read at source

Breaches & Industry News

You’re caught up.

That was all 5 stories in the 12 August issue.