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Security Affairs newsletter Round 590 by Pierluigi Paganini
Weekly Security Affairs newsletter roundup aggregating top cybercrime, malware, APT and AI security stories including ExfilSquad, Kimwolf v7 and Kimsuky AI use.
This is the Round 590 weekly newsletter from Security Affairs, linking to the week's major stories rather than reporting a single incident. Headlines include ExfilSquad extortion, a 7.3M chess.com record leak, Kimwolf botnet v7, SharePoint exploitation after a public PoC, Kimsuky integrating AI, and China-linked autonomous-style attacks. It is a digest and promotional item with no standalone technical details.
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What the 3M ChatGPT case reveals about AI governance
3M litigation shows ChatGPT prompts can become discoverable evidence, forcing enterprises to govern AI conversation records.
In the Watson Grinding explosion litigation, an engineering expert retained by 3M had used ChatGPT, and a surfaced prompt asked the system to 'show how 3M is 0% at fault'; after an off-record deposition demand, more than 350 pages of previously unproduced ChatGPT material were provided. The author argues AI interaction histories are becoming part of decision records and discovery material, a trend the American Bar Association has already examined. Enterprises are urged to manage retention, ownership, sharing, and deletion of AI conversation logs across tools like ChatGPT, Copilot, Claude, and Gemini.
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Meta adds three new features to keep WhatsApp accounts secure
Meta strengthens WhatsApp account security with alphanumeric two-step verification passwords, unknown-caller context on Android, and multiple passkeys per account.
Meta upgraded WhatsApp's two-step verification from a six-digit PIN to a longer alphanumeric password that can include special characters. On Android, calls from unsaved numbers now show context such as whether the number is registered in another country or shares groups with the recipient, countering scam urgency. More than one billion users have set up passkeys, and users can now register multiple passkeys on one account across mixed platforms.
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Apple brings a fully revamped Siri built on Google's Gemini, but not to the EU
Apple shipped its fully rebuilt Siri running on Google's Gemini models with iOS 27, initially excluding the EU and China over regulatory hurdles.
Apple released 'Siri AI' as an English beta within iOS 27, iPadOS 27, macOS 27, watchOS 27, and visionOS 27, built on Google's Gemini models running partly on-device and partly through Private Cloud Compute. The rollout excludes the EU and China at launch due to regulatory requirements, with French, Japanese, Korean, Portuguese, and Spanish support due next month. Early reviewers call it a step forward but report failures on personal-context queries and occasional hallucinations. Siri integrates with third-party apps like WhatsApp and Audible, with Outlook, Notability, and Tripsy coming later.
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AWS’s new sign-up gives accounts spend caps, email invites, and agent-set permissions
AWS's new sign-up flow gives fresh accounts agent-configured permissions, email-based team access, and per-project monthly spend caps starting at $20.
New AWS customers can sign up with Google, GitHub, or Apple identities, start with $100 in Free Tier credits, and build inside a project where AWS and coding agents automatically configure permissions and install tools like the AWS CLI and Agent Toolkit. In a demo, an agent deployed a Lambda function, DynamoDB table, and API Gateway endpoint without any manually written IAM policies. Paid projects get monthly spend limits starting at $20 that pause the project when reached, and the gradual rollout applies to new customers only.
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You don’t have to join the hack-back program to inherit its risk
A new US presidential memorandum creates a vetted private hack-back program, leaving participating vendors and their customers with untested legal liability and collateral risks.
The August 12 National Security Presidential Memorandum directs the National Coordination Center, run jointly by DOJ and DHS, to approve covert surveillance and disruptive Cyber Effects Operations by vetted private companies, with a forfeitable bond of at least $1 million required as a contract condition. The analysis argues the criminal shield rests on an untested reading of the CFAA exemption at 18 U.S.C. 1030(f), with no civil safe harbor, no state-law preemption and no foreign-law protection. Non-participating organizations can still inherit risk through shared infrastructure collateral damage, lack of customer disclosure, Lloyd's bulletin Y5381 state-backed attack exclusions, and threat-intelligence pipelines feeding offensive proposals.
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DeepSeek-v4.1 Flash: Pushing the Limits of KV Cache Compression
DeepSeek-V4.1 Flash is a 552B-parameter multimodal MoE model with 1M-token context achieving 4x KV cache compression for long-horizon agent workloads.
A detailed analysis of the DeepSeek-V4.1 Flash technical report describes a 552B-parameter multimodal mixture-of-experts model supporting contexts up to 1 million tokens. Its Causal Encoder-Decoder (CED) architecture activates 8B parameters during prefill and 16B during decode, and reportedly delivers about 420 tokens/s. Joint optimization of architecture (CSA2 cross-layer compression), FP4 KV cache precision, and deployment strategy cuts runtime KV cache to roughly 1/4 and persistent KV cache to about 1/8 of DeepSeek-V4-Flash at the same sequence length, targeting storage and bandwidth bottlenecks in long-horizon agent serving. The author notes all DeepSeek-V4 Pro models were taken offline following the release.
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Sure, Meta’s AI Muse works, but it sure creeps me out
Hands-on review finds Meta's Muse AI agent completes shopping and email tasks but surfaces personal Instagram API data beyond user-visible ad-topic settings.
Meta launched Muse, its first agentic AI productivity assistant, which performs tasks like shopping, email management, trip planning, media generation, and creating webpages or documents via a cloud-based virtual computer. The Verge's hands-on found it successfully deleted thousands of promotional emails and completed an Amazon purchase, but it also revealed detailed personal interests inferred from Instagram and Facebook account API data that is not visible in the apps' ad-topic settings. Meta says Muse only exchanges data needed for third-party integrations and does not share information with advertisers; the reviewer frames privacy unease as the main adoption hurdle.
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How much of F-Droid is LLM generated?
A FOSS maintainer manually graded 102 F-Droid apps from the September 12, 2026 update batch, finding many show signs of LLM-generated code.
A student and FOSS app maintainer reviewed 102 apps pushed to F-Droid on September 12, 2026, assigning each a three-tier rating for likelihood of LLM-authored code (mostly AI >50%, hard to say/mostly human, no signs of AI). The heuristic relies on commit aesthetics, README and branding style, and the presence of agentic infrastructure like Claude Code or Codex, which automatically places an app in the 'mostly AI' tier. Example ratings include Amber (Nostr event signer) as mostly AI, and Aria for Misskey as showing no AI signs. The author stresses reliable detection of LLM-generated code from text alone is impossible, so ratings are approximate.
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Watch out: Apple timepiece can grab snippets of conversation without both speakers' consent
Apple's Watch Series 12 Live Rewind and Siri Recap transcribe nearby conversations without bystander consent, drawing EFF criticism over all-party-consent laws.
Apple Watch Series 12's Audio Intelligence features on the S11 chip include Live Rewind, which transcribes the last 15 seconds of a conversation after a Digital Crown double-press, processing audio in a Secure Exclave and routing it to a nearby iPhone. Siri Recap generates AI summaries of daily conversations without retaining raw audio or attributing speakers. Apple says an audible chime and visual cue alert bystanders, but privacy advocates including the EFF note that 11 US states require all-party consent for recording and that bystanders have no practical way to opt in or decline.
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Doctor Doom Thanked Seattle for All the Surveillance Cameras
Activist dressed as Doctor Doom urged Seattle's council to curb Axon and Flock surveillance after a committee voted to redirect $250,000 from CCTV expansion.
Clifford Cawthon, a policy advisor at the Washington State Department of Commerce, appeared at a Seattle Public Safety Committee meeting in costume as Doctor Doom to protest the city's expanding mass surveillance. He criticized Seattle PD's access to 62 cameras feeding an Axon real-time crime center that ingests CCTV, body camera, geolocation, ALPR, and dispatch data from vendors like Axon and Flock. His group Community Not Cameras submitted a petition with five demands, and a committee already voted to move $250,000 away from CCTV expansion pending full council approval.
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Meta bets on AI agent Muse to catch up in AI race
Meta launched Muse, a free personal AI agent in the US that autonomously shops, emails, and plans trips, powered by its in-house Muse Spark model.
Meta unveiled Muse, a consumer personal AI agent that handles tasks like online shopping, emailing, and trip planning, continues working in the background, and requests approval for purchases. It launches in the US on iOS, Android, and muse.ai, is free for most users with unspecified paid tiers, and runs on Meta's in-house Muse Spark model. Muse executes on a cloud virtual machine with a Sentinel agent policing outbound actions, and Meta promises an encrypted confidential VM later this year plus 1Password, Shop Pay, and Stripe Link support. The launch is positioned as the centerpiece of Meta's effort to catch up with OpenAI, Anthropic, and Google.
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PuzzleMask: Abusing Plain Prose as a Covert AI Attack Vector
Check Point details PuzzleMask, a plain-prose technique that bypasses LLM gatekeeper policy checks, letting hidden payloads reach target models unreviewed.
Check Point Research describes PuzzleMask, a prompt-crafting technique that hides policy-violating payloads inside plain-English prose wrappers, bypassing quick LLM-based policy checks without emojis, Base64, or invisible formatting. The researchers tested 23 automated prompts against gatekeepers including GPT-4o-mini, GPT-OSS-Safeguard 20b, Claude 3 Haiku, and Llama Guard 3, and all were classified as safe despite policies that flagged the plain versions. When submitted to GPT-5 in thinking-high mode with a Python interpreter, the target model extracted and acted on the payload in over 90% of trials. The technique is not itself a jailbreak but can carry a jailbreak prompt as payload; mitigations include input paraphrasing, hardened gatekeeper policies, and output monitoring.
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The AI policy window is open. We need to act.
OpenAI calls for mandatory national AI safety regulation and backs four California AI safety bills as capabilities accelerate.
OpenAI argues the rapid pace of AI progress, including signs of AI-accelerated research, requires urgent policy action through mandatory, capability-based national regulation. The company endorses four California bills (SB 813, AB 1405, SB 1119, AB 1864) covering independent safety assessments, AI auditor standards, youth protections, and safeguards against AI-enabled biological threats. It also commits to industry-led frontier standards, international coordination, and strengthening internal safeguards such as universal trajectory monitoring and mandatory alignment-evaluation gates for its Astra model. The post references chief scientist Jakub Pachocki's warning about recursive self-improvement and Greg Brockman's "defenders window" concept.
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NVIDIA Brings Real-Time AI to Broadcast, Sports and Global Streaming at IBC
NVIDIA expanded its AI for Media suite at IBC 2026, adding NIM microservices for synthetic video detection, body pose, frame generation, upscaling and HDR.
At IBC 2026 in Amsterdam, NVIDIA announced a major expansion of NVIDIA AI for Media, a collection of GPU-accelerated SDKs, NIM microservices and blueprints for broadcast and streaming workflows. The Synthetic Video Detector (SVD) NIM microservice reaches 99.3% accuracy on text-to-video and 97.7% on image-to-video content, while Video Frame Generation boosts frame rates 2x-4x and Video Super Resolution adds 10-bit support; TrueHDR converts SDR to HDR at up to roughly 2,000 nits. Partners including Dalet, TwelveLabs, Wowza, Vizrt and Ross Video are integrating the new services into verification, compliance and live-production workflows.
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Risky Bulletin: Russia starts blocking DoH and DoT
Russian users report blocks on DoH and DoT servers, including Cloudflare 1.1.1.1 and Google 8.8.8.8, in an apparent censorship crackdown.
Russian internet users began reporting failures connecting to DNS-over-HTTPS and DNS-over-TLS servers, suggesting a government crackdown on the two privacy protocols. The blocks reportedly cover Cloudflare's 1.1.1.1 and Google's 8.8.8.8 resolvers; Roskomnadzor has not officially confirmed the action. The agency tested a similar block in March on Beeline's network and had named DoH for blocking as early as 2021. The bulletin also briefly notes state-sponsored phishing of EU officials, a DDoS against Norway's Digdir, the ReliaQuest/ShinyHunters dispute, and older ransomware and breach disclosures.
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WhatsApp Adds Stronger Security as Passkeys Hit 1 Billion
WhatsApp says 1 billion users now use passkeys, as it upgrades two-step verification to full passwords and adds context for calls from unknown numbers.
WhatsApp announced that more than 1 billion users now protect their accounts with passkeys, and that users can now add multiple passkeys across Android and iOS devices. The app's two-step verification has been upgraded from a six-digit PIN to a full alphanumeric password with special characters, strengthening protection against account takeover. On Android, callers outside a user's contacts will now show context such as country of origin and shared groups, countering urgency-driven scam calls.
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