A Chinese cybercriminal group, SilkSpecter, conducted a targeted phishing campaign during the Black Friday shopping season, focusing on e-commerce shoppers in Europe and the USA. They exploited the Stripe payment processor to steal Cardholder Data (CHD) and Sensitive Authentication Data (SAD) while allowing legitimate transactions to proceed. The group used a Chinese SaaS platform, oemapps, to quickly create fake e-commerce websites that adjusted their language based on the victim's IP location, increasing their legitimacy. The phishing sites often used deceptive top-level domains (TLDs) such as .top, .shop, and .vip, resembling well-known online stores. Key indicators of compromise included a fake "trusttollsvg" icon and the presence of a suspicious endpoint, “/homeapi/collect”, which tracked user interactions. These tactics allowed the attackers to exfiltrate sensitive data, including card information, to servers they controlled via Stripe’s API, bypassing security measures. This data could then be used for follow-up attacks like vishing or smishing. The attackers' infrastructure was linked to Chinese ASNs and platforms such as Alibaba Cloud, and the phishing kits contained Mandarin-language comments, suggesting Chinese-speaking developers were behind the operation. The group also employed SEO poisoning and social media to distribute their malicious links, capitalizing on the Black Friday shopping spike. Organizations should monitor for suspicious URLs containing keywords like "discount" or "Black Friday" and flag domains with the "trusttollsvg" icon. Users are advised to use virtual cards and exercise caution when visiting unfamiliar sites, especially those with uncommon domain extensions.
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