Suspicious File Creation In Uncommon AppData Folder
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About the rule
Rule Type
Standard
Rule Description
Detects the creation of suspicious files and folders inside the user's AppData folder but not inside any of the common and well known directories (Local, Romaing, LocalLow). This method could be used as a method to bypass detection who exclude the AppData folder in fear of FPs
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "File Created or Modified" AND ((FILENAME startswith "C:\Users" OR OBJECTNAME startswith "C:\Users") AND (FILENAME contains "\AppData" OR OBJECTNAME contains "\AppData") AND (FILENAME endswith ".bat,.cmd,.cpl,.dll,.exe,.hta,.iso,.lnk,.msi,.ps1,.psm1,.scr,.vbe,.vbs" OR OBJECTNAME endswith ".bat,.cmd,.cpl,.dll,.exe,.hta,.iso,.lnk,.msi,.ps1,.psm1,.scr,.vbe,.vbs")) AND ((FILENAME notstartswith "C:\Users" AND OBJECTNAME notstartswith "C:\Users") OR (FILENAME notcontains "\AppData\Local\,\AppData\LocalLow\,\AppData\Roaming" AND OBJECTNAME notcontains "\AppData\Local\,\AppData\LocalLow\,\AppData\Roaming")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.USERNAME,Action1.DOMAIN,Action1.OBJECTNAME,Action1.FILENAME,Action1.PROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
