By Overview
During recent website cleanup work, we analyzed a WordPress compromise where the same backdoor kept returning within seconds of every removal, no matter how carefully the visible files were deleted. Throughout this article, we’ll refer to this family of malware as SC, named after the “SC_” markers found in the injected content.
What makes SC worth documenting is how it survives. The payload lives in at least eight places at once, spread across files, the database, and shared memory, and every one of those places can rebuild all the others.
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