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Researchers from Zscaler ThreatLabz said they recently observed CoffeeLoader in the wild, describing it as a sophisticatedmalwareloader.
Call stacks can be described as a digital breadcrumb trail that records which functions a program has called.
Security tools can use call stacks to track program behavior, and detect suspicious activity.
CoffeeLoader, however, hides its tracks by forging a fake breadcrumb trail.
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It acts as the initial infection stage, often evading detection by security tools before deploying the main payload.
Zscaler describes Windows fibers as an obscure and lightweight mechanism for implementing user-mode multitasking.
CoffeeLoader uses Windows fibers to implement sleep obfuscation.
ThreatLabz has observed this packer used to protect both SmokeLoader and CoffeeLoader payloads.
