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Threat spotlight: The curious case of Ryuk ransomware

Ryuk. A name once unique to a fictional character in a popular Japanese comic book and cartoon series is now a name that appears in several rosters of the nastiest ransomware to ever grace the wild web. For an incredibly young strain—only 15 months old—Ryuk ransomware gaining such notoriety is quite a feat to achieve. Unless the threat actors behind its campaigns call it quits, too—Remember … [Read more...]

Ryuk ransomware attacks businesses over the holidays

While families gathered for food and merriment on Christmas Eve, most businesses slumbered. Nothing was stirring, not even a mouse—or so they thought. For those at Tribune Publishing and Data Resolution, however, a silent attack was slowly spreading through their networks, encrypting data and halting operations. And this attack was from a fairly new ransomware family called Ryuk. Ryuk, which made … [Read more...]

Hermes ransomware distributed to South Koreans via recent Flash zero-day

This blog post was authored by @hasherezade, Jérôme Segura and Vasilios Hioureas. At the end of January, the South Korean Emergency Response Team (KrCERT) published news of a Flash Player zero-day used in targeted attacks. The flaw, which exists in Flash Player 28.0.0.137 and below, was distributed via malicious Office documents containing the embedded Flash exploit. Only a couple of weeks after … [Read more...]