Insensitive Subfolder Search Via Findstr.EXE
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About the rule
Rule Type
Standard
Rule Description
Detects execution of findstr with the "s" and "i" flags for a "subfolder" and "insensitive" search respectively. Attackers sometimes leverage this built-in utility to search the system for interesting files or filter through results of commands.
Severity
Attention
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (COMMANDLINE contains "findstr" OR PROCESSNAME endswith "findstr.exe" OR ORIGINALFILENAME = "FINDSTR.EXE") AND (COMMANDLINE contains " -s , /s , –s , —s , ―s " AND COMMANDLINE contains " -i , /i , –i , —i , ―i ") select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Furkan CALISKAN, @caliskanfurkan_, @oscd_initiative, Nasreddine Bencherchali (Nextron Systems)
