InstallFix MSHTA Fetching Remote MSIX Bundle
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About the rule
Rule Type
Standard
Rule Description
Detects mshta.exe fetching a remote .msixbundle payload over HTTP - InstallFix fake Claude Code installer.
Severity
Trouble
Rule Requirement
Criteria
Action1:
actionname = "Process started" AND (( PROCESSNAME endswith "\mshta.exe" OR ORIGINALFILENAME = "MSHTA.EXE" ) AND COMMANDLINE contains ".msixbundle" 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
