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mukul975
cb8d79e068
- Add validated mitre_attack frontmatter to all 754 skills (286 distinct techniques), verified against MITRE ATT&CK v19.1 via the official mitreattack-python library: 0 revoked, deprecated, or invalid IDs - Curate precise per-skill technique IDs for forensics, malware-analysis, threat-intel, and red-team skills (e.g. DCSync -> T1003.006, Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003) - Reconcile v19.1 tactic restructuring: Defense Evasion split into Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.* family and T1070.001/.002 remapped to active equivalents (T1685.*) - Normalize word-split tags across 35 skills (remove filename-derived stopword tags, add semantic cybersecurity tags) - Add api-reference.md for 3 skills that were missing it - Update README ATT&CK section with accurate v19.1 tactic distribution
103 lines
3.4 KiB
Markdown
103 lines
3.4 KiB
Markdown
---
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name: detecting-suspicious-powershell-execution
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description: Detect suspicious PowerShell execution patterns including encoded commands,
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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:
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- threat-hunting
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- mitre-attack
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- powershell
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- execution
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- t1059
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- amsi
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- proactive-detection
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version: '1.0'
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author: mahipal
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license: Apache-2.0
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d3fend_techniques:
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- Executable Denylisting
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- Execution Isolation
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- File Metadata Consistency Validation
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- Content Format Conversion
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- File Content Analysis
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nist_csf:
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- DE.CM-01
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- DE.AE-02
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- DE.AE-07
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- ID.RA-05
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mitre_attack:
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- T1059.001
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- T1027.010
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- T1620
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- T1105
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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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