1type: trigger
2name: sigmahq/proc_creation_win_susp_nteventlogfile_usage
3description: |
4  Detects usage of the WMI class "Win32_NTEventlogFile" in a potentially suspicious way (delete, backup, change permissions, etc.) from a PowerShell script
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.CommandLine contains 'Win32_NTEventlogFile' && (evt.Parsed.CommandLine contains '.BackupEventlog(' || evt.Parsed.CommandLine contains '.ChangeSecurityPermissions(' || evt.Parsed.CommandLine contains '.ChangeSecurityPermissionsEx(' || evt.Parsed.CommandLine contains '.ClearEventLog(' || evt.Parsed.CommandLine contains '.Delete(' || evt.Parsed.CommandLine contains '.DeleteEx(' || evt.Parsed.CommandLine contains '.Rename(' || evt.Parsed.CommandLine contains '.TakeOwnerShip(' || evt.Parsed.CommandLine contains '.TakeOwnerShipEx('))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14
15  label: "Potentially Suspicious Call To Win32_NTEventlogFile Class"
16  behavior : "windows:audit"
17  remediation: false
18
19scope:
20  type: ParentProcessId
21  expression: evt.Parsed.ParentProcessId
22
23