Proofpoint has been closely monitoring a stealer malware formerly known as ACR Stealer. In 2025, Proofpoint analysts identified a new, unnamed malware exhibiting significant code overlap, shared features, and capabilities with ACR Stealer.
Further investigation revealed that ACR Stealer was significantly updated and rebranded as Amatera Stealer. While Amatera Stealer retains the core of its predecessor, it has undergone enough development and enhancement to stand out as a distinct and noteworthy threat.
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Source: Proofpoint
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