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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
66 lines
1.7 KiB
Markdown
66 lines
1.7 KiB
Markdown
# API Reference: Hunting for Webshell Activity
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## Process Tree Detection
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| Parent Process | Child Process | Severity |
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|----------------|---------------|----------|
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| w3wp.exe | cmd.exe, powershell.exe | CRITICAL |
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| httpd/apache2 | bash, sh, python | CRITICAL |
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| tomcat/java | cmd.exe, bash | CRITICAL |
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| nginx | bash, sh | CRITICAL |
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## Splunk SPL - Web Server Shell Spawn
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```spl
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index=sysmon EventCode=1
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| where match(ParentImage, "(?i)(w3wp|httpd|apache2|nginx|tomcat)")
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| where match(Image, "(?i)(cmd\.exe|powershell|bash|whoami|net\.exe)")
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| table _time Computer ParentImage Image CommandLine User
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```
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## KQL - Web Shell Process Chain
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```kql
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DeviceProcessEvents
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| where InitiatingProcessFileName in~ ("w3wp.exe", "httpd", "apache2", "nginx")
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| where FileName in~ ("cmd.exe", "powershell.exe", "bash", "whoami.exe")
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| project Timestamp, DeviceName, InitiatingProcessFileName, FileName, ProcessCommandLine
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```
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## Web Access Log Patterns
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```python
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webshell_patterns = [
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r"POST\s+.*\.(asp|aspx|php|jsp)\s+", # POST to script files
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r"cmd=|exec=|command=|shell=", # Command parameters
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r"c99shell|r57shell|b374k|weevely", # Known webshell names
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]
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```
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## Sigma Rule - Webshell Detection
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```yaml
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title: Webshell Spawning Shell Process
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logsource:
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category: process_creation
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product: windows
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detection:
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parent:
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ParentImage|endswith: '\w3wp.exe'
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child:
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Image|endswith:
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- '\cmd.exe'
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- '\powershell.exe'
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condition: parent and child
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level: critical
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tags:
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- attack.persistence
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- attack.t1505.003
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```
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### References
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- MITRE T1505.003: https://attack.mitre.org/techniques/T1505/003/
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- SANS Webshell Detection: https://www.sans.org/white-papers/
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- Sigma webshell rules: https://github.com/SigmaHQ/sigma
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