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mukul975
27c6414ca5
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
71 lines
1.9 KiB
Markdown
71 lines
1.9 KiB
Markdown
# API Reference: Detecting Fileless Attacks on Endpoints
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## Key Event Sources
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| Source | Event ID | Detection |
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|--------|----------|-----------|
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| PowerShell Script Block | 4104 | Malicious script content |
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| Sysmon Process Create | 1 | Encoded command execution |
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| Sysmon CreateRemoteThread | 8 | Reflective DLL injection |
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| Sysmon WMI EventFilter | 19 | WMI persistence |
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| Sysmon WMI EventConsumer | 20 | WMI persistence |
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| Sysmon WMI Binding | 21 | WMI persistence |
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## python-evtx Usage
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```python
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import Evtx.Evtx as evtx
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with evtx.Evtx("PowerShell-Operational.evtx") as log:
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for record in log.records():
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xml = record.xml()
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# Parse Event 4104 ScriptBlockText
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```
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## Suspicious PowerShell Patterns
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```python
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# Dynamic execution
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r"Invoke-Expression|IEX\s*\("
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# Reflective loading
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r"System\.Reflection\.Assembly.*Load"
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# Memory injection APIs
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r"VirtualAlloc|VirtualProtect|CreateThread"
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# WMI persistence
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r"Register-WMI|__EventFilter|__EventConsumer"
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# Encoded commands
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r"-enc\s|-encodedcommand\s"
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```
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## Splunk SPL - Fileless Detection
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```spl
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index=powershell EventCode=4104
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| where match(ScriptBlockText, "(?i)(Invoke-Expression|IEX|VirtualAlloc|FromBase64)")
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| stats count by ScriptBlockText, Computer, UserID
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```
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## AMSI (Anti-Malware Scan Interface)
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```powershell
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# Enable AMSI logging
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Set-MpPreference -EnableNetworkProtection Enabled
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# Check AMSI status
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Get-MpComputerStatus | Select AMServiceEnabled, AntispywareEnabled
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```
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## WMI Persistence Detection
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```powershell
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# List WMI event subscriptions
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Get-WMIObject -Namespace root\Subscription -Class __EventFilter
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Get-WMIObject -Namespace root\Subscription -Class __EventConsumer
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Get-WMIObject -Namespace root\Subscription -Class __FilterToConsumerBinding
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```
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## CLI Usage
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```bash
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python agent.py --ps-log PowerShell-Operational.evtx
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python agent.py --sysmon-log Sysmon.evtx --check-wmi --check-injection
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```
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