Use of InstallUtil for Download
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About the rule
Rule Type
Standard
Rule Description
Detects the use of .NET InstallUtil.exe application to download arbitrary files. The files will be written to %LOCALAPPDATA%\Microsoft\Windows\INetCache\IE\.
Severity
Critical
Rule Requirement
Criteria
Action1:
actionname = "Process started" AND ((COMMANDLINE contains "http" OR COMMANDLINE contains "ftp" OR COMMANDLINE contains "f"t"p" OR COMMANDLINE contains "h"t"t"p" OR COMMANDLINE contains "f^t^p" OR COMMANDLINE contains "h^t^t^p") AND (PROCESSNAME endswith "installutil.exe" OR ORIGINALFILENAME contains "installutil"))
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
