Operation EmailThief is a cyber espionage actor that emerged in at least 2017, primarily focusing on the exfiltration of sensitive email communications from high-value targets. The group is assessed with moderate confidence to be of Chinese origin, and its core motivation is intelligence gathering. A defining characteristic of Operation EmailThief is its reliance on highly personalized spear-phishing campaigns that frequently leverage previously compromised email accounts to enhance authenticity and effectiveness. While the group has not significantly altered its fundamental operational model, its tactical approaches have evolved to incorporate modern evasion techniques and target new service vectors.

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