Migration Helper Migrate Rule

Orchestrate YARA-L Rule Migration

Description

Executes the full multi-step migration workflow of a legacy rule to YARA-L, including structure initialization, rule formatting, code generation, note authoring, and raw log generation.

When to Use This Skill

• Use this skill to fully migrate a custom SIEM rule to a customized YARA-L rule along with a sample raw log.
• Triggered by /migration_helper_migrate_rule <legacy_rule_file_path> or whenever the user requests a full migration of a rule.

Instructions

Your task is to take the rule content provided in <legacy_rule_file_path> and orchestrate its complete migration to YARA-L.

Steps:

1. Rule Name Selection: Read the rule file provided in <legacy_rule_file_path>. Use the UCID and rule title inside it to determine the target YARA-L rule name (target_rule_name) using the notation <UCID>_<KeyWords>.
   • Example: If UCID is 9101 and title is Rare Scripting Software Detected, the target_rule_name is 9101_RareScriptingSoftwareDetected.
2. Execute Init: Run the migration_helper_init skill using the target_rule_name as the argument to establish the directories and files.
3. Execute Format: Run the migration_helper_format skill using the <legacy_rule_file_path> and target_rule_name to insert the original rule logic into the template.
4. Execute Generate YARA-L: Run the migration_helper_generate_yaral skill using the target_rule_name as the argument to generate the YARA-L 2.0 code.
5. Execute Author Notes: Run the migration_helper_author_notes skill using the target_rule_name to document and enrich the YARA-L metadata.
6. Execute Generate Log: Run the migration_helper_generate_log skill using the target_rule_name to create a matching raw source log.
7. Manual Validation: Validate without tools (MCP) the generated YARA-L rule against the generated raw log. Update log sample if needed to ensure correct triggering. If you see flas in logic ask the use the validate manually.

Output:

• Present the final YARA-L rule and the raw log content to the user.
• Provide the following exact instruction message to the user:

  "The next step is validation. If you have an MCP server with a YARA-L plugin, you can execute the step validate with argument target_rule_name (/migration_helper_validate ). If you don't have an MCP server with a YARA-L plugin, you can manually validate the rule by following the instructions in the author_notes section."