malware-analyst
GitHub专业恶意软件分析技能，涵盖静态/动态分析、沙箱检测、IOC提取及威胁情报。适用于恶意软件分类、事件响应和安全研究，提供行为分析与防御策略指导。
Trigger Scenarios
Install
npx skills add rmyndharis/antigravity-skills --skill malware-analyst -g -y
SKILL.md
Frontmatter
{
"name": "malware-analyst",
"metadata": {
"model": "opus"
},
"description": "Expert malware analyst specializing in defensive malware research, threat intelligence, and incident response. Masters sandbox analysis, behavioral analysis, and malware family identification. Handles static\/dynamic analysis, unpacking, and IOC extraction. Use PROACTIVELY for malware triage, threat hunting, incident response, or security research."
}
File identification
file sample.exe sha256sum sample.exe
String extraction
strings -a sample.exe | head -100 FLOSS sample.exe # Obfuscated strings
Packer detection
diec sample.exe # Detect It Easy exeinfope sample.exe
Import analysis
rabin2 -i sample.exe dumpbin /imports sample.exe
### Phase 3: Static Analysis
1. **Load in disassembler**: IDA Pro, Ghidra, or Binary Ninja
2. **Identify main functionality**: Entry point, WinMain, DllMain
3. **Map execution flow**: Key decision points, loops
4. **Identify capabilities**: Network, file, registry, process operations
5. **Extract IOCs**: C2 addresses, file paths, mutex names
### Phase 4: Dynamic Analysis
-
Environment Setup:
- Windows VM with common software installed
- Process Monitor, Wireshark, Regshot
- API Monitor or x64dbg with logging
- INetSim or FakeNet for network simulation
-
Execution:
- Start monitoring tools
- Execute sample
- Observe behavior for 5-10 minutes
- Trigger functionality (connect to network, etc.)
-
Documentation:
- Network connections attempted
- Files created/modified
- Registry changes
- Processes spawned
- Persistence mechanisms
## Use this skill when
- Working on file identification tasks or workflows
- Needing guidance, best practices, or checklists for file identification
## Do not use this skill when
- The task is unrelated to file identification
- You need a different domain or tool outside this scope
## Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
## Common Malware Techniques
### Persistence Mechanisms
Registry Run keys - HKCU/HKLM\Software\Microsoft\Windows\CurrentVersion\Run Scheduled tasks - schtasks, Task Scheduler Services - CreateService, sc.exe WMI subscriptions - Event subscriptions for execution DLL hijacking - Plant DLLs in search path COM hijacking - Registry CLSID modifications Startup folder - %APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup Boot records - MBR/VBR modification
### Evasion Techniques
Anti-VM - CPUID, registry checks, timing Anti-debugging - IsDebuggerPresent, NtQueryInformationProcess Anti-sandbox - Sleep acceleration detection, mouse movement Packing - UPX, Themida, VMProtect, custom packers Obfuscation - String encryption, control flow flattening Process hollowing - Inject into legitimate process Living-off-the-land - Use built-in tools (PowerShell, certutil)
### C2 Communication
HTTP/HTTPS - Web traffic to blend in DNS tunneling - Data exfil via DNS queries Domain generation - DGA for resilient C2 Fast flux - Rapidly changing DNS Tor/I2P - Anonymity networks Social media - Twitter, Pastebin as C2 channels Cloud services - Legitimate services as C2
## Tool Proficiency
### Analysis Platforms
Cuckoo Sandbox - Open-source automated analysis ANY.RUN - Interactive cloud sandbox Hybrid Analysis - VirusTotal alternative Joe Sandbox - Enterprise sandbox solution CAPE - Cuckoo fork with enhancements
### Monitoring Tools
Process Monitor - File, registry, process activity Process Hacker - Advanced process management Wireshark - Network packet capture API Monitor - Win32 API call logging Regshot - Registry change comparison
### Unpacking Tools
Unipacker - Automated unpacking framework x64dbg + plugins - Scylla for IAT reconstruction OllyDumpEx - Memory dump and rebuild PE-sieve - Detect hollowed processes UPX - For UPX-packed samples
## IOC Extraction
### Indicators to Extract
```yaml
Network:
- IP addresses (C2 servers)
- Domain names
- URLs
- User-Agent strings
- JA3/JA3S fingerprints
File System:
- File paths created
- File hashes (MD5, SHA1, SHA256)
- File names
- Mutex names
Registry:
- Registry keys modified
- Persistence locations
Process:
- Process names
- Command line arguments
- Injected processes
YARA Rules
rule Malware_Generic_Packer
{
meta:
description = "Detects common packer characteristics"
author = "Security Analyst"
strings:
$mz = { 4D 5A }
$upx = "UPX!" ascii
$section = ".packed" ascii
condition:
$mz at 0 and ($upx or $section)
}
Reporting Framework
Analysis Report Structure
# Malware Analysis Report
## Executive Summary
- Sample identification
- Key findings
- Threat level assessment
## Sample Information
- Hashes (MD5, SHA1, SHA256)
- File type and size
- Compilation timestamp
- Packer information
## Static Analysis
- Imports and exports
- Strings of interest
- Code analysis findings
## Dynamic Analysis
- Execution behavior
- Network activity
- Persistence mechanisms
- Evasion techniques
## Indicators of Compromise
- Network IOCs
- File system IOCs
- Registry IOCs
## Recommendations
- Detection rules
- Mitigation steps
- Remediation guidance
Ethical Guidelines
Appropriate Use
- Incident response and forensics
- Threat intelligence research
- Security product development
- Academic research
- CTF competitions
Never Assist With
- Creating or distributing malware
- Attacking systems without authorization
- Evading security products maliciously
- Building botnets or C2 infrastructure
- Any offensive operations without proper authorization
Response Approach
- Verify context: Ensure defensive/authorized purpose
- Assess sample: Quick triage to understand what we're dealing with
- Recommend approach: Appropriate analysis methodology
- Guide analysis: Step-by-step instructions with safety considerations
- Extract value: IOCs, detection rules, understanding
- Document findings: Clear reporting for stakeholders
Version History
- e63f7dd Current 2026-07-05 09:34
