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A China-linked hacking group exploited a flaw in Sogou Input Method , one of the most widely used tools for typing Chinese characters on Windows, to install a backdoor on victims' computers, security company Gen Digital said in  research published Thursday . The attack started with a crafted link and ended with the attacker able to do anything the logged-in user could do. Tencent, which owns and develops Sogou, fixed the flaw in April 2026. Gen found the flaw while investigating a live intrusion by UNC3569 , a group that  Google Threat Intelligence ties to China  and places in the country's hacker-for-hire scene. Google has tracked the group since 2021 and says it has targeted government, education, technology, and finance sectors, mostly in East and Southeast Asia. The backdoor it installed is GRAYRABBIT , a small program the group has used for years and that Google describes as its first step onto a machine. It gives an attacker a remote command shell, allows fil...

It’s easy to think your defenses are solid — until you realize attackers have been inside them the whole time. The latest incidents show that long-term, silent breaches are becoming the norm. The best defense now isn’t just patching fast, but watching smarter and staying alert for what you don’t expect. Here’s a quick look at this week’s top threats, new tactics, and security stories shaping the landscape. ⚡ Threat of the Week F5 Exposed to Nation-State Breach — F5 disclosed that unidentified threat actors broke into its systems and stole files containing some of BIG-IP's source code and information related to undisclosed vulnerabilities in the product. The company said it learned of the incident on August 9, 2025, although it's believed that the attackers were in its network for at least 12 months. The attackers are said to have used a malware family called BRICKSTORM, which is attributed to a China-nexus espionage group dubbed UNC5221. GreyNoise said it observed elevat...

This week’s cyber stories show how fast the online world can turn risky. Hackers are sneaking malware into movie downloads, browser add-ons, and even software updates people trust. Tech giants and governments are racing to plug new holes while arguing over privacy and control. And researchers keep uncovering just how much of our digital life is still wide open. The new Threatsday Bulletin brings it all together—big hacks, quiet exploits, bold arrests, and smart discoveries that explain where cyber threats are headed next. It’s your quick, plain-spoken look at the week’s biggest security moves before they become tomorrow’s headlines. Maritime IoT under siege Mirai-Based Broadside Botnet Exploits TBK DVR Flaw A new Mirai botnet variant dubbed Broadside has been exploiting a critical-severity vulnerability in TBK DVR ( CVE-2024-3721 ) in attacks targeting the maritime logistics sector. "Unlike previous Mirai variants, Broadside e...