1type: trigger
2name: sigmahq/proc_creation_win_powershell_set_acl_susp_location
3description: |
4  Detects PowerShell scripts to set the ACL to a file in the Windows folder
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.OriginalFileName in ['PowerShell.EXE', 'pwsh.dll'] || evt.Parsed.Image endsWith '\\powershell.exe' || evt.Parsed.Image endsWith '\\pwsh.exe') && evt.Parsed.CommandLine contains 'Set-Acl ' && evt.Parsed.CommandLine contains '-AclObject ' && (evt.Parsed.CommandLine contains '-Path "C:\\Windows' || evt.Parsed.CommandLine contains '-Path \'C:\\Windows' || evt.Parsed.CommandLine contains '-Path %windir%' || evt.Parsed.CommandLine contains '-Path $env:windir') && (evt.Parsed.CommandLine contains 'FullControl' || evt.Parsed.CommandLine contains 'Allow'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14
15  label: "PowerShell Set-Acl On Windows Folder"
16  behavior : "windows:audit"
17  remediation: false
18
19scope:
20  type: ParentProcessId
21  expression: evt.Parsed.ParentProcessId
22
23