Powershell IEX Download In Base64

powershell IEX((new-object net.webclient).downloadstring( string in base64 form

Sigma rule (View on GitHub)

 1title: Powershell IEX Download In Base64
 2status: experimental
 3description: powershell IEX((new-object net.webclient).downloadstring( string in base64 form
 4author: Joe Security
 5date: 2019-10-23
 6id: 200009
 7threatname:
 8behaviorgroup: 1
 9classification: 8
10mitreattack:
11
12logsource:
13    category: process_creation
14    product: windows
15detection:
16    selection:
17        CommandLine:
18            - '*powershell*SUVYKChuZXctb2JqZWN0IG5ldC53ZWJjbGllbnQpLmRvd25sb2Fkc3RyaW5nK*'
19    condition: selection
20level: critical
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