YARA Rule Creation

Create file-based detection signatures:

• String patterns
• Hex byte patterns
• PE characteristics
• Import analysis
• Entropy checks

Required Context

1. Sample: Malware sample or pattern description
2. Strings: Key strings to match
3. Context: Malware family, false positive considerations

Output

• YARA rule with metadata
• Test commands

Testing

yara -s rule.yar sample.exe
yara -r rule.yar /samples/

Example

/yara
Sample: /samples/cobalt_beacon.exe
Focus: Unique strings, API imports