OneDrive Standalone Updater
OneDriveStandaloneUpdater
Download a file from the web address specified in HKCU\Software\Microsoft\OneDrive\UpdateOfficeConfig\UpdateRingSettingURLFromOC. ODSUUpdateXMLUrlFromOC and UpdateXMLUrlFromOC must be equal to non-empty string values in that same registry key. UpdateOfficeConfigTimestamp is a UNIX epoch time which must be set to a large QWORD such as 99999999999 (in decimal) to indicate the URL cache is good. The downloaded file will be in %localappdata%\OneDrive\StandaloneUpdater\PreSignInSettingsConfig.json
Download a file from the Internet without executing any anomalous executables with suspicious arguments
%localappdata%\Microsoft\OneDrive\OneDriveStandaloneUpdater.exe
IOC: HKCU\Software\Microsoft\OneDrive\UpdateOfficeConfig\UpdateRingSettingURLFromOC being set to a suspicious non-Microsoft controlled URL, IOC: Reports of downloading from suspicious URLs in %localappdata%\OneDrive\setup\logs\StandaloneUpdate_*.log files, Sigma: https://github.com/SigmaHQ/sigma/blob/ff5102832031425f6eed011dd3a2e62653008c94/rules/windows/registry/registry_set/registry_set_lolbin_onedrivestandaloneupdater.yml
Elliot Killick (@elliotkillick)