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