fastprox.dll
WMI Custom Marshaller file version info
Library on Windows 2 known copies with hashes 2 Sigma rules name it
Is it the real fastprox.dll?
Installed in
C:\Windows\system32\wbem\C:\Windows\SysWOW64\wbem\Signed byMicrosoft Windows
ProductMicrosoft Windows Operating System, Microsoft Corporation
DescriptionWMI Custom Marshaller
2 known copies
10.0.19041.1 (WinBuild.160101.0800) · C:\Windows\SysWOW64\wbem\fastprox.dll · signed by Microsoft Windows
b983bb89bef2320b464afbe44f58b193c463c43e5f365cff3fda50a0e344d2c610.0.19041.1 (WinBuild.160101.0800) · C:\Windows\system32\wbem\fastprox.dll · signed by Microsoft Windows
c55f9f4ec2d4c5cddd98d1c8da9c3f6ea2a8a7c7f94485bbf5b7321f2aa3f2c0From 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 fastprox.dll in 2 rules, for every kind of event; none is a process creation rule CmdID evaluates, so none is listed.