fltLib.dll
Filter Library file version info
Library on Windows 2 known copies with hashes 1 Sigma rule names it
Is it the real fltLib.dll?
Original name
filterLib.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
DescriptionFilter Library
2 known copies
10.0.19041.1 (WinBuild.160101.0800) · C:\Windows\system32\fltLib.dll · signed by Microsoft Windows
22dca63ff7248d8d37f29d927414f692fb0084acd1abe4d63a3442a41300c4ef10.0.19041.1 (WinBuild.160101.0800) · C:\Windows\SysWOW64\fltLib.dll · signed by Microsoft Windows
ed3984eefa55950a88cd487e47df3d85cd5da1821cf9cc440b80422997176fc5From the file’s version info and the copies 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. In Ceplin, "<sha256>".whatis() says which known copy a hash is.
What detects it
Sigma names fltLib.dll in 1 rule, for every kind of event; none is a process creation rule CmdID evaluates, so none is listed.