News

• Hackers are using blockchains to keep malware instructions available after servers disappear
• AI is making blockchain-based malware infrastructure easier for less experienced hackers
• Blockchain traffic is difficult to block without disrupting legitimate cryptocurrency services worldwide

Hackers are increasingly hiding malware instructions inside public blockchains, creating communication channels that can survive the removal of conventional infrastructure.

New figures from Chainalysis claim malicious blockchain activity increased 440%, with daily entries rising from 2.06 to 11.1 after newer AI systems emerged.

The technique gives attackers another way to maintain communication with compromised computers without relying entirely on conventional servers controlled by hosting providers.

Blockchain dead drops use transaction data or smart contracts as lookup points, allowing infected computers to retrieve commands, addresses, or configuration information.

Because blockchain records are distributed across networks, removing a conventional server does not erase information already stored on the ledger.

A North Korean-linked operation associated with UNC5342 uses TRON and Aptos as alternate routes before retrieving encrypted instructions through the BNB Chain.

Its malware can check one network, switch to another when necessary, and retrieve updated addresses without receiving another malware package.

Iranian actors suspected of links to the country's intelligence ministry have embedded encoded routing information inside Bitcoin transactions used for malware retrieval.

Russian-speaking cybercriminals have also commercialized the technique, using Polygon contracts to provide blockchain-backed infrastructure for malware campaigns operated by different customers.

One related operator controls more than 50 BNB Chain resolver contracts while also conducting activity involving fraudulent tokens and clipboard-monitoring malware.

These operations show how blockchain records can function as persistent lookup infrastructure rather than merely serving their conventional financial and transactional purposes.

Chainalysis said the sharp increase in this malicious activity followed the arrival of high-capacity Chinese open models, which placed fewer restrictions on malware development requests.

Before those systems appeared, building reliable blockchain-based malware infrastructure required expertise across malicious software, cryptocurrency networks, and distributed communication systems.

AI tools can reduce that knowledge barrier by helping less experienced operators understand unfamiliar technologies and produce components needed for blockchain communication.

In the second quarter of 2026, state-linked groups accounted for roughly two-thirds of newly observed activity.

Those groups also represent about half of overall observed activity, indicating that blockchain-based malware infrastructure extends beyond conventional cybercriminal operations.

Defenders face difficulties because blocking blockchain traffic could also disrupt legitimate wallets, decentralized applications, exchanges, and decentralized finance services used worldwide.

Attackers can further complicate disruption by operating their own blockchain nodes, reducing dependence on external providers that defenders might otherwise pressure or disable.

Some operators have hidden server addresses inside wallet identifiers without usable private keys, then used zero-value transfers to trigger malware retrieval.

Those transactions leave public records that investigators can examine, potentially providing useful clues even when attackers attempt to conceal their infrastructure.

"While the exploitation of blockchain by state-linked organizations such as North Korea is becoming more sophisticated, on-chain records left by attackers can actually serve as important clues to track them," said Kwon Jun-hyeok, General Manager of Chainalysis Korea.

"Tracking these traces and identifying attackers and related infrastructure through blockchain intelligence will become increasingly important in responding to new cyber threats."

A new NYT Connections puzzle appears at midnight each day for your time zone – which means that some people are always playing 'today's game' while others are playing 'yesterday's'. If you're looking for Monday's puzzle instead then click here: NYT Connections hints and answers for Monday, September 21 (game #1198).

Good morning! Let's play Connections, the NYT's clever word game that challenges you to group answers in various categories. It can be tough, so read on if you need Connections hints.

What should you do once you've finished? Why, play some more word games of course. I've also got daily Strands hints and answers and Quordle hints and answers articles if you need help for those too, while Marc's Wordle today page covers the original viral word game.

SPOILER WARNING: Information about NYT Connections today is below, so don't read on if you don't want to know the answers.

Today's NYT Connections words are…

• THIS
• THAT
• THE
• OTHER
• CAFE
• PATRON
• AGREE
• ACCENT
• TOUCH
• THOSE
• ROSE
• NEUTRAL
• DETAIL
• DISAGREE
• THESE
• FLOURISH

What are some clues for today's NYT Connections groups?

• YELLOW: Determiners
• GREEN: Adornment
• BLUE: A quiz with choices
• PURPLE: Fancy drinks

Need more clues?

We're firmly in spoiler territory now, but read on if you want to know what the four theme answers are for today's NYT Connections puzzles…

What are the answers for today's NYT Connections groups?

• YELLOW: DEMONSTRATIVES
• GREEN: EMBELLISHMENT
• BLUE: OPTIONS ON A MULTIPLE CHOICE SURVEY
• PURPLE: BEVERAGES WITH ACUTE ACCENTS REMOVED

Right, the answers are below, so DO NOT SCROLL ANY FURTHER IF YOU DON'T WANT TO SEE THEM.

The answers to today's Connections, game #1199, are…

• YELLOW: DEMONSTRATIVES: THAT, THESE, THIS, THOSE
• GREEN: EMBELLISHMENT: ACCENT, DETAIL, FLOURISH, TOUCH
• BLUE: OPTIONS ON A MULTIPLE CHOICE SURVEY: AGREE, DISAGREE, NEUTRAL, OTHER
• PURPLE: BEVERAGES WITH ACUTE ACCENTS REMOVED: CAFE, PATRON, ROSE, THE

• My rating: Easy
• My score: Perfect

Connections loves to hide a clue to another group on one of the tiles and today it was ACCENT.

This tile featured in the green group for EMBELLISHMENT but may also have tipped some crafty players off to the fact that we were searching for a group featuring accents or, as it happened, BEVERAGES WITH ACUTE ACCENTS REMOVED.

Before linking the fancy drinks I took a bit of a risk with the yellow group, having to choose between THE and THIS. Had I paid attention more at school I may have found this task easier — demonstratively easier, even. Yet somehow I scraped through without a single error.

• YELLOW: EMAIL BUTTONS: COMPOSE, DRAFTS, SENT, SPAM
• GREEN: WAYS TO ATTRACT FISH: CHUM, FLY, SPINNER, WORM
• BLUE: CHESS VERBS: CAPTURE, CASTLE, CHECK, MATE
• PURPLE: STARTS OF COMPOSERS' NAMES: BEET, BRAH, CHOP, VIVA

NYT Connections is one of several increasingly popular word games made by the New York Times. It challenges you to find groups of four items that share something in common, and each group has a different difficulty level: green is easy, yellow a little harder, blue often quite tough and purple usually very difficult.

On the plus side, you don't technically need to solve the final one, as you'll be able to answer that one by a process of elimination. What's more, you can make up to four mistakes, which gives you a little bit of breathing room.

It's a little more involved than something like Wordle, however, and there are plenty of opportunities for the game to trip you up with tricks. For instance, watch out for homophones and other word games that could disguise the answers.

It's playable for free via the NYT Games site on desktop or mobile.

• HKUST (Guangzhou) and HK PolyU researchers' InjectEave beams a radio carrier at devices so their own circuits leak analog audio
• The leaked audio has already been decrypted by the device itself, making encryption offer no protection against such an approach
• The 30m headline needed a pricey amplifier pushing output to 10 W, while standard ranges of 1 to 6m were measured by detecting a test tone

Researchers at the Hong Kong University of Science and Technology and the Hong Kong Polytechnic University have shown that everyday headphones, a desk phone, and a handful of smart-home gadgets can broadcast what they are doing simply by using a radio signal.

The technique, called InjectEave, was presented at USENIX Security 2026 in Baltimore, and multiple outlets have since covered the researcher's claim that the attack "can recover headphone audio from up to 30 meters away, including through walls".

The claim may be accurate, but it has limitations, including the need for specialized equipment that is often very noticeable in most settings.

Conventional electromagnetic eavesdropping waits for a device to leak. That works poorly for audio, because speech sits below 20 kHz while a device's wiring radiates efficiently only at megahertz or gigahertz frequencies.

InjectEave chooses to close the gap by transmitting a carrier signal at the target. According to the paper, nonlinear components such as amplifiers, analog-to-digital converters, switching MOSFETs, and power converters mix the secret signal onto that carrier, and the device's own traces and cables radiate the result back to a receiver.

Because the leak happens in the analog path, after audio has been decoded, the project page states that "InjectEave is immune to digital defenses such as encryption, masking, and randomization." Encryption in any form on a wireless headset is irrelevant, since the attack directly targets the signal driving the speaker, not the radio link.

The team demonstrating this used a USRP B210 software-defined radio, two antennas, a Siglent spectrum analyzer, and a laptop to set up their proof of concept, which could, as they noted, "eavesdrop on the majority of these devices from over 2m away and through walls, with a maximum distance of 30m for recovering intelligible headphone audio".

This isn't the first time the technique has been used, even as the researchers have built on it considerably; the idea originates from "The Thing," a Soviet bug given as a gift to the US ambassador in Moscow in 1945, which was passively powered remotely as a listening device.

InjectEve, however, does not involve planting anything; instead, it leverages existing work on interference-induced leakage and impedance-based backscatter, and distinguishes itself by recovering coarse digital data rather than continuous analog waveforms, allowing users to 'listen in' without added steps.

The same approach applies to wired headphones, which are also prone to leaking microphone audio; researchers concluded that their sound cards were the primary source of the leaks, which were being sent back over very short distances.

The threat is somewhat tempered by the fact that it can capture what users hear but, with wireless headphones, cannot hear what the user is saying. The attacker also has to transmit continuously and use a high-powered (10W) transmitter to reach the full 30-meter range, even though capturing and rendering speech is harder than the tones the test used to prove the approach worked.

The attacker also needs to know the target model and profile a matching unit first, although they managed to get a profile to transfer cleanly across three identical UGreen headsets, suggesting this might be easier than one would assume.

The researchers say they reported the findings to the affected manufacturers but, "as we have not yet received a response," withheld the table's frequencies and stripped injection control logic from their released code. One shouldn't be too hopeful, however, as no software update can fix an analog leak, and it is relatively limited in practical abuse cases.

• CISA added three Linux kernel flaws (CVE‑2025‑39682, CVE‑2026‑53266, CVE‑2025‑39964) to KEV catalog
• Red Hat confirmed active exploitation; agencies given rare three‑day patch deadline expiring Sept 21, 2026
• Bugs enable DoS, privilege escalation, or data corruption; patches available, limited mitigations for two flaws

The US Cybersecurity and Infrastructure Security Agency (CISA) has added three Linux flaws to its Known Exploited Vulnerabilities (KEV) catalog, signaling abuse in the wild and giving government agencies a deadline to patch or stop using the flawed product entirely.

The three bugs in question are tracked as CVE-2025-39682 (severity score 9.8/10 - critical), CVE-2026-53266 (severity score 8.8/10 - high), and CVE-2025-39964 (severity score 7.8/10 - high). All three have already been patched in the Linux kernel. CVE-2025-39682 was fixed in stable releases 6.1.149, 6.6.103, 6.12.44 and 6.16.4, while CVE-2025-39964 was fixed in 5.10.245, 5.15.194, 6.1.154, 6.6.108, 6.12.49 and 6.16.9. CVE-2026-53266 has been fixed upstream and backported to supported stable/distribution kernel branches, including 5.10.259, 6.1.176 and 6.12.94.

The first issue is an improper check for unusual or exceptional conditions vulnerability in the TLS receive patch which could allow unauthenticated threat actors to launch memory disclosure or denial-of-service (DoS) attacks. The second one (CVE-2026-53266) is an out-of-bounds write vulnerability in the ebtables Source Network Address Translation (SNAT) Address Resolution Protocol (ARP) rewrite patch which allows local attackers to escalate privileges or mount DoS attacks.

The last one (CVE-2025-39964) is a race condition flaw that allows concurrent writes to the same AF_ALG socket, which allows local malicious actors to crash the system or corrupt cryptographic operation results, leading to data integrity issues and possible DoS states.

Red Hat acknowledged that all three are being abused in real-life attacks. “This CVE is high risk and there are known public exploits leveraging this vulnerability. Address this vulnerability with high priority,” it said in all three advisories.

However, there are no details as to who is currently using these exploits, against whom, and to what cause. There are currently no separate reports of cyberattacks referencing any of the abovementioned vulnerabilities.

However, CISA still reacted. All three flaws were added on September 18, 2026, and all three have a small three-day deadline for patching that expires on September 21. Usually, CISA would grant Federal Civilian Executive Branch (FCEB) agencies a three-week deadline to patch up, with just exceptionally dangerous flaws getting a shorter window. That being said, these flaws are likely extremely dangerous.

In a hypothetical scenario, a threat actor could target a Linux system using kernel TLS (kTLS) by sending a specially-crafted TLS record that triggers CVE-2025-39682 and causing either a crash, or even arbitrary code execution. Attackers that already have a low privilege foothold on the target endpoint could use CVE_2025-39964 to escalate privileges, while on systems using the affected bridge/netfilter configuration, CVE-2026-53266 could be used for privilege escalation, as well.

According to the Red Hat advisory, there is a chance that CVE-2025-39682 is remotely triggerable, but only when the system is using the affected kTLS receive path. The other two flaws are exclusively local vulnerabilities.

Besides fixes, two out of the three flaws also have possible mitigations. For the improper check one, users should prevent module tls from being loaded. For the out-of-bounds write one, users are advised to disable ARP hardware address rewriting in ebtables SNAT rules, or remove ebtables SNAT rules that operate on ARP traffic on bridge interfaces. The final vulnerability, currently does not have a working mitigation, and the only way to stay secure is to apply the provided patches.

Linux kernel vulnerabilities are generally considered serious, but the severity still depends on the flaw and how the affected kernel is deployed. Earlier this year, security researchers disclosed four local privilege escalation flaws, called DirtyAH6 (CVE-2026-80844), TUNderflow (CVE-2026-81000), PPPoEject (CVE-2026-68121), and DiagSpill (CVE-2026-74469).

Via The Hacker News