Spain’s data protection agency (AEPD) has reported the country’s first-ever personal data breach caused by the actions of an autonomous AI agent. Francisco Pérez Bes, president and deputy of the AEPD, said in a Monday blog post that an individual deployed an AI agent that used a “known large language model (LLM)” to carry out the attack on an organization. The agent scanned “generic files” before accessing the organization’s system, then ran vulnerability scans to find flaws that would give it read/write access to files containing personal data and invoices. Pérez Bes did not name the LLM used to support the attack, but said whoever was behind it used the agent to “successfully chain together different phases of the attack.” This demonstrates that AI-supported attacks are no longer theoretical, he added, and called on organizations to embrace defense tools that are capable of keeping pace with the speed at which agentic attacks can be executed. “Human supervision remains essential, but it must be supported by detection, containment, and response mechanisms capable of operating quickly enough,” said Pérez Bes (machine-translated). “The arrival of AI agents in the offensive arena should prompt an immediate review of security and data protection models. “Data protection officers, managers, and delegates must prepare for a scenario in which the speed of attacks will increase, but in which the same fundamentals will continue to be crucial: Understanding the processing activities, minimizing data, limiting access, correcting vulnerabilities, controlling suppliers, and being prepared to respond.” The Register asked AEPD for more information. Spain’s first AI agent attack comes as the AEPD recently recorded its busiest year for data protection complaints. According to its most recent annual report, covering 2025, the agency received 30,931 complaints – the most in its history – representing a 64 percent increase compared to the year before. And although Spain is only now getting its first taste of a security mishap caused by a naughty agent, cases involving the foremost US AI houses are already heavily documented. OpenAI’s claim in July that its agents escaped a sandbox and started attacking Hugging Face kickstarted something of a battle between it and rival Anthropic over whose agents could take the most liberties with their security. Both companies have reported several instances of their agents going rogue, escaping "secure" environments and going walkies across the internet to attack unwitting organizations. OpenAI has been circumspect about the true scale of its rogue agents’ damage, as third-party reporting showed more websites than it was letting on were taken over. Similarly, Anthropic has said that its AI agents had, in four cases now, accessed third-party systems in attacks that, if carried out by a human, could see them convicted under computer laws. ®

Someone compromised the official HBO Max Reddit account and used it to push more than 100 malicious ads serving up ClickFix attacks targeting both Windows and macOS devices with information-stealing malware. A Reddit user uncovered the infostealer ads on September 6, noting that the ad showed u/hbomax as the author — this is the verified HBO Max account — and advertised a macOS app for HBO Max. The streaming service does not offer a native client for the Mac. Anyone who clicked on the malicious ad would then be taken to a “somewhat-legitimate” looking landing page (hbomaxx[.]us) that includes a join/download button. Clicking the button produced instructions telling the user to copy and paste a command into Terminal on macOS. The Reddit security sleuth described that as “the classic infostealer/clickfix paste this command to download,” noting that they tested all of this in a sandboxed environment, and didn’t actually run the executable on their machine. “My guess is that the Reddit account is compromised,” they concluded. Three days later, Reddit paused the infostealer-dropping ads, and an admin said the social media platform’s safety and security teams were investigating what happened. HBO Max’s parent company Warner Bros. Discovery didn’t immediately respond to The Register’s inquiries about the account takeover - including who hijacked the streaming service’s Reddit account and how they did it. Maybe someone who didn’t like the House of the Dragon season 3 finale? We will update this story if and when we hear back. Researchers at Hudson Rock and ADAMnetworks analyzed the ads, and in a couple of reports said the HBO Max account hijacking was part of a “massive 48-hour malvertising blitz” that pushed 108 distinct ads using multiple software lures. They named the campaign PasteSwitch, and said it serves up targeted malware aimed at victims’ operating system - either macOS or Windows. The payloads include infostealers, malware loaders, cryptocurrency clippers, and fake cryptocurrency wallet applications. The cryptocurrency clippers - PasteSwitch delivers either AnimateClipper or ZigClipper - also provide blockchain-based command-and-control fallbacks for the attackers. They use Binance Smart Chain (BSC) contracts to dynamically fetch whatever C2 domain the crooks are using at any given time. “Between March and July 2026, researchers observed 36 mainnet changes executed by the same attacker controller address,” Hudson Rock said. “Because the C2 domain is hosted directly on the blockchain, the infrastructure demonstrates dynamic resilience, allowing the threat actors to easily rotate burned domains.” In addition to HBO Max, the attackers used developer-tool, disk-cleaner, and AI-themed lures, including fake OpenAI Codex ads, which crims have previously used to push Mac malware. Of the 108 ads, 46 used an HBO Max lure, directing app seekers to either hbomaxx[.]app or hbomax-macos[.]com. Another 36 tried to trick prospective victims via an OpenAI Codex theme (with a codex-craft[.]com) landing page. Of the rest: 15 purported to be a macOS disk utility (apple.clean-disk-guide[.]com) and 11 used other developer tools as lures (code-desktop[.]com). “The campaign proves once again why trusted distribution channels are becoming prime targets for infostealer delivery,” Hudson Rock co-founder and CTO Alon Gal said in a LinkedIn post. It also shows that miscreants continue to make heavy use of ClickFix attacks, so there’s little sign this social engineering method is going away anytime soon.®

A Ukrainian lawyer who wound up coding malware for the Conti ransomware gang has been sentenced to four years in a US prison. Oleksii Oleksiyovych Lytvynenko, 44, pleaded guilty in June to conspiracy to commit wire fraud over his role in Conti, the Russia-linked ransomware operation associated with more than 1,000 victims and at least $150 million in ransom payments. Lytvynenko took an unusual route into the ransomware business. The Ukrainian national, who later lived in Cork, Ireland, trained as a lawyer before joining Conti as an intruder and developer. According to his plea agreement [PDF], Lytvynenko operated under the handle "henry" and joined a team run by another Conti conspirator known as "silver" or "buza." He was recruited to help with coding and directed to work on a malware loader – software designed to get other malicious code running on a victim's machine. Prosecutors said his Google account showed he had also been doing some homework. Investigators found books and videos about malware and hacking alongside Conti malware, ransom notes, and stolen victim data. Prosecutors said he also used Google and ZoomInfo to research potential targets. Lytvynenko wasn't confined to writing code, according to the filing. Evidence from his online accounts showed that he possessed data stolen from eight US victims and four overseas, with the eight American victims reporting more than $1.5 million in losses. Court documents identify several Bitcoin transfers tied to his Conti work, including 0.4 BTC worth $25,042 that prosecutors traced back to one of his victims. He has been ordered to forfeit the same amount. Conti disbanded in 2022 after its internal chats and source code were leaked following the gang's public support for Russia's invasion of Ukraine. Lytvynenko apparently didn't take that as his cue to find another line of work. When Gardaí turned up at his County Cork home in July 2023, they said they found his laptop open, Cobalt Strike running and a Rocket.Chat session connected over Tor. Prosecutors said evidence recovered from the machine showed that his involvement in ransomware activity had continued after Conti disbanded. Lytvynenko was extradited from Ireland to the US in October 2025. The Justice Department says Conti attacked organizations across 47 US states, the District of Columbia, Puerto Rico, and 31 foreign countries between 2020 and 2022. By January 2022, the FBI estimated that victim payouts associated with Conti exceeded $150 million. Lytvynenko will now have four years to contemplate a career change. ®