Suspicious Powershell In Registry Run Keys

Detects potential PowerShell commands or code within registry run keys

Sigma rule (View on GitHub)

 1title: Suspicious Powershell In Registry Run Keys
 2id: 8d85cf08-bf97-4260-ba49-986a2a65129c
 3status: test
 4description: Detects potential PowerShell commands or code within registry run keys
 5references:
 6    - https://github.com/frack113/atomic-red-team/blob/a9051c38de8a5320b31c7039efcbd3b56cf2d65a/atomics/T1547.001/T1547.001.md#atomic-test-9---systembc-malware-as-a-service-registry
 7    - https://www.trendmicro.com/en_us/research/22/j/lv-ransomware-exploits-proxyshell-in-attack.html
 8author: frack113, Florian Roth (Nextron Systems)
 9date: 2022/03/17
10modified: 2023/08/17
11tags:
12    - attack.persistence
13    - attack.t1547.001
14logsource:
15    category: registry_set
16    product: windows
17detection:
18    selection:
19        TargetObject|contains: '\Software\Microsoft\Windows\CurrentVersion\Run' # Also covers "RunOnce" and "RunOnceEx"
20        Details|contains:
21            - 'powershell'
22            - 'pwsh '
23            - 'FromBase64String'
24            - '.DownloadFile('
25            - '.DownloadString('
26            - ' -w hidden '
27            - ' -w 1 '
28            - '-windowstyle hidden'
29            - '-window hidden'
30            - ' -nop '
31            - ' -encodedcommand '
32            - '-ExecutionPolicy Bypass'
33            - 'Invoke-Expression'
34            - 'IEX ('
35            - 'Invoke-Command'
36            - 'ICM -'
37            - 'Invoke-WebRequest'
38            - 'IWR '
39            - ' -noni '
40            - ' -noninteractive '
41    condition: selection
42falsepositives:
43    - Legitimate admin or third party scripts. Baseline according to your environment
44level: medium

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