Yellow Cockatoo Powershell Startup Folder Persistence (RedCanary Threat Detection Report)

 1title: Yellow Cockatoo Powershell Startup Folder Persistence (RedCanary Threat Detection Report)
 2id: 874acb07-02f7-4c9f-8069-e0659c6d3fad
 3status: experimental
 4description: |
 5    Detects .lnk files created by Powershell in the startup folder. Associated with (but not unique to)
 6    Yellow Cockatoo, AKA Solarmarker/Jupyter Stealer. Part of the RedCanary 2023 Threat Detection Report.    
 7references:
 8    - https://redcanary.com/threat-detection-report/threats/yellow-cockatoo/
 9author: RedCanary, Sigma formatting by Micah Babinski
10date: 2023/05/10
11tags:
12    - attack.initial_access
13    - attack.defense_evasion
14    - attack.t1566
15logsource:
16    category: file_event
17    product: windows
18detection:
19    selection_img:
20        Image|endswith: '\powershell.exe'
21    selection_filepath:
22        TargetFilename|contains: 'start menu\programs\startup'
23    selection_file_ext:
24        TargetFilename|endswith: '.lnk'
25    condition: all of selection*
26falsepositives:
27    - Unknown
28level: low```