SCR File Write Event
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About the rule
Rule Type
Standard
Rule Description
Detects the creation of screensaver files (.scr) outside of system folders. Attackers may execute an application as an ".SCR" file using "rundll32.exe desk.cpl,InstallScreenSaver" for example.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "File Created or Modified" AND (FILENAME endswith ".scr" OR OBJECTNAME endswith ".scr") AND (FILENAME notcontains ":\$WINDOWS.~BT\NewOS\,:\Windows\System32\,:\Windows\SysWOW64\,:\Windows\WinSxS\,:\WUDownloadCache" AND OBJECTNAME notcontains ":\$WINDOWS.~BT\NewOS\,:\Windows\System32\,:\Windows\SysWOW64\,:\Windows\WinSxS\,:\WUDownloadCache") select Action1.HOSTNAME,Action1.MESSAGE,Action1.USERNAME,Action1.DOMAIN,Action1.OBJECTNAME,Action1.FILENAME,Action1.PROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Christopher Peacock @securepeacock, SCYTHE @scythe_io
