WindowsCodecsExt.dll
Microsoft Windows Codecs Extended Library file version info
Library on Windows 2 known copies with hashes 1 Sigma rule names it
Is it the real WindowsCodecsExt.dll?
WindowsCodecsExt in the file’s header: a renamed copy still carries itC:\Windows\system32\C:\Windows\SysWOW64\2 known copies
10.0.19041.1 (WinBuild.160101.0800) · C:\Windows\SysWOW64\WindowsCodecsExt.dll · signed by Microsoft Windows
4c8f94bf017dbe431950520921e661e27e9d1cc27eb98675c81c2ba0378bf9ba10.0.19041.1 (WinBuild.160101.0800) · C:\Windows\system32\WindowsCodecsExt.dll · signed by Microsoft Windows
edec167a2e7d02a114aec4f84c84468f421647990a2bc4a56406c92204884e51From 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 WindowsCodecsExt.dll in 1 rule, for every kind of event; none is a process creation rule CmdID evaluates, so none is listed.