Methods, apparati, and computer-readable media for detecting the presence of malicious computer code in a computer. In a method embodiment, persistence points in an operating system of the computer are examined (31). When a pointer to a temporary directory is found (32) at a persistence point, a declaration is made (34) of a suspicion of malicious code being present in the computer. Second and third method embodiments are used when the computer has a native operating system (14) controlling hardware (11) functions and a user-interface operating system (12) built on top of the native operating system (14). A fourth method embodiment is used when the computer has an operating system comprising a kernel (20) and a user interface (21).
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