mapistub.dll
Extended MAPI 1.0 for Windows NT file version info
Library on Windows 2 Sigma rules name it
Is it the real mapistub.dll?
Original name
MAPI32.DLL in the file’s header: a renamed copy still carries itInstalled in
C:\Windows\system32\C:\Windows\SysWOW64\Signed byMicrosoft Windows
ProductMicrosoft Windows Operating System, Microsoft Corporation
DescriptionExtended MAPI 1.0 for Windows NT
From the file’s version info, as recorded by xCyclopedia (MIT). A copy in another folder, signed by someone else or with another hash is not necessarily malicious, but it is worth a closer look.
What detects it
Sigma names mapistub.dll in 2 rules, for every kind of event; none is a process creation rule CmdID evaluates, so none is listed.