Halogen is a command-line tool designed to automate the creation of YARA rules based on image files embedded within malicious documents. The tool assists cybersecurity professionals in developing detection rules for malicious threats and helps incident responders identify specific threats they are investigating. The tool currently supports the analysis of JPG and PNG image files embedded in office documents. It provides several matching options for different image formats, including PNG IDAT chunk matching and various JPG matching strategies such as Start of Scan marker detection and SOF to SOS matching with additional data bytes. Halogen offers flexible input options, allowing users to analyze individual files or entire directories. The tool generates custom YARA rules with user-specified names and includes options for different rule prefixes. It supports various matching strategies to accommodate different analysis requirements and can output rules compatible with ClamAV signatures.
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