Potential File Download Via MS-AppInstaller Protocol Handler
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About the rule
Rule Type
Standard
Rule Description
Detects usage of the "ms-appinstaller" protocol handler via command line to potentially download arbitrary files via AppInstaller.EXE The downloaded files are temporarly stored in ":\\Users\\%username%\\AppData\\Local\\Packages\\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\\AC\\INetCache\\{RANDOM-8-CHAR-DIRECTORY}"
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "Process started" AND COMMANDLINE contains "ms-appinstaller://?source=" AND COMMANDLINE contains "http"
select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME,Action1.DOMAIN,Action1.ORIGINALFILENAME,Action1.PARENTPROCESSID,Action1.PROCESSID,Action1.PRODUCT_NAME,Action1.SECURITYID
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel
