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mukul975
79 lines
3.1 KiB
Markdown
79 lines
3.1 KiB
Markdown
---
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name: detecting-suspicious-powershell-execution
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description: Detect suspicious PowerShell execution patterns including encoded commands, download cradles, AMSI bypass attempts, and constrained language mode evasion.
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domain: cybersecurity
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subdomain: threat-hunting
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tags: [threat-hunting, mitre-attack, powershell, execution, t1059, amsi, proactive-detection]
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version: "1.0"
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author: mahipal
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license: MIT
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---
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# Detecting Suspicious Powershell Execution
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## When to Use
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- When proactively hunting for indicators of detecting suspicious powershell execution in the environment
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- After threat intelligence indicates active campaigns using these techniques
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- During incident response to scope compromise related to these techniques
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- When EDR or SIEM alerts trigger on related indicators
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- During periodic security assessments and purple team exercises
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## Prerequisites
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- EDR platform with process and network telemetry (CrowdStrike, MDE, SentinelOne)
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- SIEM with relevant log data ingested (Splunk, Elastic, Sentinel)
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- Sysmon deployed with comprehensive configuration
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- Windows Security Event Log forwarding enabled
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- Threat intelligence feeds for IOC correlation
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## Workflow
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1. **Formulate Hypothesis**: Define a testable hypothesis based on threat intelligence or ATT&CK gap analysis.
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2. **Identify Data Sources**: Determine which logs and telemetry are needed to validate or refute the hypothesis.
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3. **Execute Queries**: Run detection queries against SIEM and EDR platforms to collect relevant events.
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4. **Analyze Results**: Examine query results for anomalies, correlating across multiple data sources.
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5. **Validate Findings**: Distinguish true positives from false positives through contextual analysis.
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6. **Correlate Activity**: Link findings to broader attack chains and threat actor TTPs.
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7. **Document and Report**: Record findings, update detection rules, and recommend response actions.
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## Key Concepts
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| Concept | Description |
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|---------|-------------|
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| T1059.001 | PowerShell |
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| T1059.003 | Windows Command Shell |
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| T1562.001 | Disable or Modify Tools |
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## Tools & Systems
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| Tool | Purpose |
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|------|---------|
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| CrowdStrike Falcon | EDR telemetry and threat detection |
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| Microsoft Defender for Endpoint | Advanced hunting with KQL |
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| Splunk Enterprise | SIEM log analysis with SPL queries |
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| Elastic Security | Detection rules and investigation timeline |
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| Sysmon | Detailed Windows event monitoring |
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| Velociraptor | Endpoint artifact collection and hunting |
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| Sigma Rules | Cross-platform detection rule format |
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## Common Scenarios
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1. **Scenario 1**: Base64 encoded PowerShell command launched by macro document
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2. **Scenario 2**: IEX download cradle fetching payload from C2 server
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3. **Scenario 3**: AMSI bypass via reflection patching before payload execution
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4. **Scenario 4**: PowerShell Empire agent communicating with C2
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## Output Format
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```
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Hunt ID: TH-DETECT-[DATE]-[SEQ]
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Technique: T1059.001
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Host: [Hostname]
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User: [Account context]
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Evidence: [Log entries, process trees, network data]
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Risk Level: [Critical/High/Medium/Low]
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Confidence: [High/Medium/Low]
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Recommended Action: [Containment, investigation, monitoring]
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```
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