Rebulyzer

“Rebultan Email Header Analyzer”

Synopsis

Analyzing email headers is critical in identifying potential phishing campaigns and detecting security threats. However, sharing internal information, such as email headers with third-party OSInt services, can be risky and compromise an organization’s security. Rebulyzer is a Bash script designed to help DFIR and SOC analysts quickly and safely analyze email headers without risking data leakage.

Rebulyzer provides a secure and reliable way to analyze email headers while keeping internal information confidential. By integrating with VirusTotal’s API, Rebulyzer can comprehensively analyze potential indicators of compromise (IOCs), making it a valuable tool for any organization looking to enhance its email security practices.

Quick Guide

To use Rebulyzer, follow these steps:

1. Download the script from the Rebulyzer GitHub repository: https://github.com/strainerart/Rebulyzer
2. Create an env file and add your VirusTotal API key. Save the file in the same directory as the Rebulyzer script.
3. Save the email header you want to analyze a file named header.txt, also in the same directory as the script.
4. Open a terminal window and navigate to the directory where you saved the Rebulyzer script and the env and header.txt files.
5. Make the Rebulyzer script executable by running the following command: chmod +x rebulyzer.sh
6. Run the Rebulyzer script with the following command: ./rebulyzer.sh header.txt

Making the script executable allows you to run it as a command from the terminal. If you skip this step, you won’t be able to execute the script and will receive an error message. By running the chmod +x command, you permit yourself to execute the script.

Key Information to Look for in Email Headers

When analyzing email headers for signs of phishing campaigns or other security threats, there are several key pieces of information that analysts should look for:

1. Sender Information: The “From” field in an email header can give insights into the sender’s identity. Look for any inconsistencies or suspicious email addresses or domains.
2. Delivery Path: The “Received” fields in an email header can provide a trail of the servers that the email passed through before reaching the recipient’s mailbox. Look for any unusual or unexpected servers in this path.
3. Authentication: The “Authentication-Results” field can indicate whether the email passed authentication checks and whether it came from a trusted source.
4. Return-Path: The “Return-Path” field can indicate the email address where bounced messages are sent. Look for any discrepancies between this field and the “From” field.
5. URLs and IP addresses: Look for any suspicious or unfamiliar URLs or IP addresses in the email header, as these could indicate a phishing campaign or other security threat.
6. Attachments: Check for any attachments in the email, especially if they are in unusual file formats or if the email appears to be from an unexpected sender.

Bottom Line Up Front

Phishing campaigns remain a significant security threat, and detecting them quickly and effectively is critical for maintaining any organization’s security. Rebulyzer is a powerful tool that helps DFIR and SOC analysts analyze email headers and identify potential threats safely and efficiently.

By providing a secure and reliable way to analyze email headers, Rebulyzer helps organizations prevent data leakage while still gaining valuable insights. By integrating with VirusTotal’s API, Rebulyzer provides a comprehensive analysis of potential IOCs, making it a useful tool for any organization looking to enhance its email security practices.

In conclusion, Rebulyzer is a powerful tool that helps DFIR and SOC analysts make their phishing campaign investigations easier, faster, and safer from data leakage. With its ease of use and comprehensive analysis capabilities, Rebulyzer is a valuable addition to any organization’s security toolkit.