Cybersecurity experts from Bitdefender have found that budget Android smartphones, such as the Doogee S200 X, Doogee Fire 3 Max, and Cubot KINGKONG X, may come pre-loaded with malware embedded in their firmware, posing significant security risks. This malware is introduced during the manufacturing process, particularly affecting devices with MediaTek chipsets. Thousands of users in around 150 countries, including Mexico, France, Italy, the United States, Germany, Brazil, and Spain, have been impacted. Bitdefender identified a network of 32 malicious applications disguised as legitimate utilities that generate fraudulent ad impressions. Some infected phones can function as residential proxies for criminal activities, including spam campaigns and DDoS attacks. Uninstalling the malicious app may not eliminate the infection if it is integrated into the system software, potentially requiring firmware-level remediation. Buyers of budget phones should research manufacturers' supply chain control and commitment to security updates.