Threat Overview

The Gentlemen ransomware group has recently emerged as a highly sophisticated threat actor, targeting various industries across 17 countries with a particular focus on the Asia-Pacific region. This detailed report sheds light on their advanced tactics, techniques, and procedures (TTPs), providing security analysts with crucial insights to better protect their environments.

Report Details

• Published By: AlienVault
• Date Published: 2025-09-09
• Confidence Level: 100%
• Reliability of the Report: A – Completely reliable

Key Findings

The Gentlemen ransomware group demonstrates a high level of sophistication in their operations, utilizing custom tools to bypass enterprise endpoint protections. Their methods include exploiting legitimate drivers, manipulating Group Policy settings, and encrypting data for exfiltration. The group’s reconnaissance efforts are thorough, allowing them to adapt their defense evasion techniques based on the specific security solutions encountered.

Tactics, Techniques, and Procedures (TTPs)

The Gentlemen ransomware employs a range of TTPs designed to maximize their impact while minimizing detection. Key tactics include:

• Reconnaissance: The group conducts extensive reconnaissance to understand the target’s environment, including identifying key assets and security measures.
• Defense Evasion: They use adaptive techniques to bypass security solutions, such as custom tools designed to evade detection by endpoint protection systems.
• Lateral Movement: The attackers leverage privileged domain accounts and Group Policy Objects (GPOs) to move laterally within the network, compromising multiple systems.
• Persistence: The group ensures long-term access by exploiting legitimate drivers and manipulating system configurations.
• Data Exfiltration: Encrypted data is exfiltrated from the compromised environment, ensuring that sensitive information can be accessed even after detection and removal of the ransomware.

Industry Impact

The Gentlemen ransomware group has targeted industries across 17 countries, with a significant focus on the Asia-Pacific region. Their campaigns have affected multiple sectors, highlighting the need for robust security measures to protect against such advanced threats.

Recommendations for Mitigation

• Enhanced Monitoring: Implement continuous monitoring and logging of network activities to detect unusual behavior that may indicate an ongoing attack.
• Endpoint Protection: Deploy advanced endpoint protection solutions that can identify and block custom tools used by threat actors.
• Access Controls: Limit the use of privileged accounts and regularly review access permissions to minimize lateral movement opportunities.
• Security Awareness Training: Educate employees on recognizing phishing attempts and other social engineering tactics that may be used to gain initial access.
• Regular Updates: Ensure all systems and software are up-to-date with the latest security patches to prevent exploitation of known vulnerabilities.

Additional Resources

For more detailed information, please refer to the following external references:
Trend Micro Report on Gentlemen Ransomware
AlienVault OTX Pulse