Yellow Cockatoo PowerShell Suspicious .NET Methods (RedCanary Threat Detection Report)

 1title: Yellow Cockatoo PowerShell Suspicious .NET Methods (RedCanary Threat Detection Report)
 2id: e2c6d4c8-2e14-47a8-b22c-e4c9e7e65d0e
 3status: experimental
 4description: Detects suspicious Powershell script load contents associated with Yellow Cockatoo, AKA Solarmarker/Jupyter Stealer. Part of the RedCanary 2023 Threat Detection Report.
 5references:
 6    - https://redcanary.com/threat-detection-report/threats/yellow-cockatoo/
 7author: RedCanary, Sigma formatting by Micah Babinski
 8date: 2023/05/10
 9tags:
10    - attack.initial_access
11    - attack.defense_evasion
12    - attack.t1566
13logsource:
14    category: ps_script
15    product: windows
16    definition: 'Requirements: Script Block Logging must be enabled'
17detection:
18    selection:
19        ScriptBlockText|contains:
20            - 'aescryptoserviceprovider'
21            - 'frombase64string'
22            - 'user32.dll'
23    condition: selection
24falsepositives:
25    - Unknown
26level: low```