Elastic low stable eql
File with Suspicious Extension Downloaded
Identifies unusual files downloaded from outside the local network that have the potential to be abused for code execution.
Detection Logic
file where host.os.type == "windows" and event.type == "creation" and
file.extension : (
"appinstaller", "application", "appx", "appxbundle", "cpl", "diagcab", "diagpkg", "diagcfg", "manifest",
"msix", "pif", "search-ms", "searchConnector-ms", "settingcontent-ms", "symlink", "theme", "themepack"
) and file.Ext.windows.zone_identifier > 1 and
not
(
(
file.extension : "msix" and
file.path : (
"?:\\Users\\*\\AppData\\Local\\Temp\\WinGet\\Microsoft.Winget.Source*",
"?:\\Windows\\system32\\config\\systemprofile\\AppData\\Local\\Microsoft\\WinGet\\State\\defaultState\\Microsoft.PreIndexed.Package\\Microsoft.Winget.Source*"
)
) or
(
process.name : "Teams.exe" and process.code_signature.trusted == true and
file.extension : "msix" and
file.path : "?:\\Users\\*\\AppData\\Roaming\\Microsoft\\Teams\\tmp\\*"
)
) Field Validations
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