1type: trigger
2name: sigmahq/proc_creation_win_powershell_susp_download_patterns
3description: |
4  Detects suspicious PowerShell download patterns that are often used in malicious scripts, stagers or downloaders (make sure that your backend applies the strings case-insensitive)
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.CommandLine contains 'IEX ((New-Object Net.WebClient).DownloadString' || evt.Parsed.CommandLine contains 'IEX (New-Object Net.WebClient).DownloadString' || evt.Parsed.CommandLine contains 'IEX((New-Object Net.WebClient).DownloadString' || evt.Parsed.CommandLine contains 'IEX(New-Object Net.WebClient).DownloadString' || evt.Parsed.CommandLine contains ' -command (New-Object System.Net.WebClient).DownloadFile(' || evt.Parsed.CommandLine contains ' -c (New-Object System.Net.WebClient).DownloadFile(')
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1059.001
15
16  label: "Suspicious PowerShell Download and Execute Pattern"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24