Suspicious Group And Account Reconnaissance Activity Using Net.EXE
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About the rule
Rule Type
Standard
Rule Description
Detects suspicious reconnaissance command line activity on Windows systems using Net.EXE Check if the user that executed the commands is suspicious (e.g. service accounts, LOCAL_SYSTEM)
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\net.exe,\net1.exe" OR ORIGINALFILENAME = "net.exe,net1.exe") AND (((COMMANDLINE contains " group , localgroup " AND COMMANDLINE contains "domain admins, administrator, administrateur,enterprise admins,Exchange Trusted Subsystem,Remote Desktop Users,Utilisateurs du Bureau à distance,Usuarios de escritorio remoto, /do") AND COMMANDLINE notcontains " /add") OR (COMMANDLINE contains " accounts " AND COMMANDLINE contains " /do")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Active Directory
Author
Florian Roth (Nextron Systems), omkar72, @svch0st, Nasreddine Bencherchali (Nextron Systems)
