Change Default File Association Via Assoc
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About the rule
Rule Type
Standard
Rule Description
Detects file association changes using the builtin "assoc" command. When a file is opened, the default program used to open the file (also called the file association or handler) is checked. File association selections are stored in the Windows Registry and can be edited by users, administrators, or programs that have Registry access or by administrators using the built-in assoc utility. Applications can modify the file association for a given file extension to call an arbitrary program when a file with the given extension is opened.
Severity
Attention
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\cmd.exe" OR ORIGINALFILENAME = "Cmd.Exe") AND COMMANDLINE contains "assoc" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Timur Zinniatullin, oscd.community
