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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
60 lines
1.8 KiB
Markdown
60 lines
1.8 KiB
Markdown
# API Reference: PowerShell Script Block Logging Analysis
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## python-evtx Library
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### FileHeader
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```python
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from Evtx.Evtx import FileHeader
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with open(evtx_path, "rb") as f:
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fh = FileHeader(f)
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for record in fh.records():
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xml_string = record.xml() # Returns XML string of the event
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```
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### Event XML Structure (Event ID 4104)
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```xml
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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
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<System>
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<EventID>4104</EventID>
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<TimeCreated SystemTime="2024-01-15T10:30:00.000Z"/>
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</System>
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<EventData>
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<Data Name="MessageNumber">1</Data>
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<Data Name="MessageTotal">3</Data>
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<Data Name="ScriptBlockText">...powershell code...</Data>
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<Data Name="ScriptBlockId">guid-string</Data>
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<Data Name="Path">C:\script.ps1</Data>
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</EventData>
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</Event>
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```
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## lxml etree Parsing
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```python
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from lxml import etree
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NS = {"evt": "http://schemas.microsoft.com/win/2004/08/events/event"}
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root = etree.fromstring(xml_bytes)
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event_id = root.find(".//evt:System/evt:EventID", NS).text
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data_elems = root.findall(".//evt:EventData/evt:Data", NS)
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for elem in data_elems:
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name = elem.get("Name")
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value = elem.text
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```
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## Script Block Reconstruction
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Large PowerShell scripts are split across multiple Event 4104 entries:
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- `ScriptBlockId`: Unique GUID shared across all parts
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- `MessageNumber`: Part index (1-based)
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- `MessageTotal`: Total number of parts
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- Reconstruct: concatenate parts ordered by MessageNumber
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## Key Detection Patterns
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| Pattern | MITRE | Risk |
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|---------|-------|------|
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| `-EncodedCommand` | T1059.001 | High |
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| `FromBase64String` | T1140 | High |
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| `Invoke-Expression` / `iex` | T1059.001 | High |
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| `DownloadString` / `Net.WebClient` | T1105 | Critical |
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| `AmsiUtils` / `amsiInitFailed` | T1562.001 | Critical |
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| `Invoke-Mimikatz` | T1003 | Critical |
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| High entropy (>5.5) | T1027 | Medium |
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