1type: trigger
2name: sigmahq/proc_creation_win_powershell_iex_patterns
3description: |
4  Detects suspicious ways to run Invoke-Execution using IEX alias
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.Image endsWith '\\powershell.exe' || evt.Parsed.Image endsWith '\\pwsh.exe') && (evt.Parsed.CommandLine contains ' | iex;' || evt.Parsed.CommandLine contains ' | iex ' || evt.Parsed.CommandLine contains ' | iex}' || evt.Parsed.CommandLine contains ' | IEX ;' || evt.Parsed.CommandLine contains ' | IEX -Error' || evt.Parsed.CommandLine contains ' | IEX (new' || evt.Parsed.CommandLine contains ');IEX ') && (evt.Parsed.CommandLine contains '::FromBase64String' || evt.Parsed.CommandLine contains '.GetString([System.Convert]::') || evt.Parsed.CommandLine contains ')|iex;$' || evt.Parsed.CommandLine contains ');iex($' || evt.Parsed.CommandLine contains ');iex $' || evt.Parsed.CommandLine contains ' | IEX | ' || evt.Parsed.CommandLine contains ' | iex\\"')
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 IEX Execution Patterns"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24