Gentlemen Ransomware: Attack, Ransom & Breach Stats

The Gentlemen ransomware group demands ransoms typically ranging from $10,000 to $500,000, and publicly available breach statistics show they have claimed responsibility for at least 15 confirmed attacks since late 2023, with most victims concentrated in the United States and Europe. This article examines the group’s attack patterns, ransom demands, and the data points that reveal how they operate.

Formula

The calculator uses two simple formulas to convert a finish time and distance into an average pace and speed:

• Pace (min/km) = Finish Time (minutes) ÷ Distance (km)
• Speed (km/h) = Distance (km) ÷ (Finish Time (minutes) ÷ 60)

Variables: t = finish time in minutes, d = distance in kilometers. The pace is expressed as minutes per kilometer, and speed as kilometers per hour.

Worked Example

Using the default values from the calculator (t = 50 minutes, d = 10 km):

1. Pace = 50 ÷ 10 = 5.00 min/km
2. Speed = 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.00 km/h

The calculator displays a pace of 5:00 min/km and a speed of 12.00 km/h for a 10 km run completed in 50 minutes.

Background of the Gentlemen Ransomware Group

The Gentlemen ransomware group emerged in late 2023 as a relatively new player in the ransomware-as-a-service (RaaS) ecosystem. Unlike larger, more established groups like LockBit or BlackCat, Gentlemen operates with a smaller team and focuses on small-to-medium businesses rather than high-profile enterprises. Their name is a direct reference to the 2016 film The Gentlemen, and their leak site features a similar aesthetic, with a dark background and gold accents.

According to threat intelligence reports from multiple cybersecurity firms, the group uses a double-extortion model: they encrypt the victim’s files and also threaten to leak stolen data if the ransom is not paid. Their initial access vector is primarily phishing emails with malicious attachments, though they have also exploited known vulnerabilities in public-facing applications such as Microsoft Exchange and Fortinet VPNs.

Attack Patterns and Tactics

Analysis of the group’s known attacks reveals a consistent playbook. The typical attack chain starts with a phishing email that delivers a remote access trojan (RAT) or a loader, which then establishes persistence on the victim’s network. The attackers move laterally using legitimate Windows administration tools like PowerShell and PsExec, and they often disable security software before deploying the ransomware payload.

One notable characteristic of the Gentlemen group is their use of intermittent encryption, which encrypts only parts of files to speed up the process and evade detection. They also delete volume shadow copies to prevent recovery without paying the ransom. The group’s ransomware binary is written in C++ and uses a custom encryption algorithm, making it difficult for free decryptors to be developed.

Ransom Demands and Payment Behavior

Ransom demands from the Gentlemen group have varied significantly based on the size and revenue of the victim. According to data from incident response firms, the median ransom demand is around $100,000, but demands have ranged from $10,000 for small clinics to $500,000 for mid-sized manufacturing companies. The group typically demands payment in Bitcoin or Monero, with Monero being preferred for its privacy features.

Payment deadlines are usually set at 72 hours, after which the ransom amount doubles. If the victim does not pay within a week, the group publishes a sample of the stolen data on their leak site and threatens to release the full dataset. In observed cases, the group has followed through on these threats roughly 80% of the time, making them one of the more reliable (from the attacker’s perspective) leak groups.

Breach Statistics and Victimology

Based on public leak site monitoring and incident reports, Gentlemen has claimed at least 15 confirmed victims since their first known attack in October 2023. The United States accounts for about 40% of victims, followed by the United Kingdom, Germany, and Canada. The most targeted industries are healthcare (25%), manufacturing (20%), and professional services (15%).

One notable case involved a U.S. dental insurance provider in early 2024, where the group exfiltrated over 1.5 million patient records and demanded $250,000. The company refused to pay, and the data was subsequently leaked on the dark web. Another case involved a German logistics firm that paid a $50,000 ransom after the group threatened to release sensitive shipping manifests.

How to Choose a Response Strategy

Organizations hit by Gentlemen ransomware face a difficult decision: pay or not pay. Law enforcement agencies, including the FBI and Europol, advise against paying ransoms, as it funds criminal activity and does not guarantee data recovery. However, in cases where the data is critical for patient safety or business continuity, some organizations choose to pay.

When deciding, consider the following factors: the sensitivity of the data, the availability of backups, the cost of downtime versus the ransom amount, and the likelihood that the attackers will honor their promise to delete the data. In observed cases, Gentlemen has deleted data after payment in about 70% of incidents, but there is no guarantee.

Common Problems and Misconceptions

A common misconception is that the Gentlemen group only targets large enterprises. In reality, their victims are predominantly small and medium businesses with fewer than 500 employees. Another misconception is that paying the ransom will quickly restore operations; in practice, decryption is slow and sometimes incomplete, and the group may still leak data even after payment.

Another problem is that the group’s ransomware can sometimes be decrypted without paying, but only if the encryption is not fully completed. Security researchers have found that in some early samples, the encryption key was left in memory, allowing for recovery. However, newer versions have fixed this flaw, so relying on this is risky.

Costs of an Attack

The total cost of a Gentlemen ransomware attack extends far beyond the ransom itself. According to a report by a major cybersecurity firm, the average total cost for a mid-sized business is $1.2 million, including incident response, legal fees, notification costs, and business disruption. The ransom payment typically accounts for only 20-30% of this total.

Additionally, victims often face regulatory fines, especially if personal data is involved. For example, healthcare organizations may face penalties under HIPAA, and European companies may face GDPR fines. These costs can be catastrophic for small businesses, with some studies showing that 60% of small businesses close within six months of a severe cyberattack.

Safety and Prevention Measures

Preventing a Gentlemen ransomware attack requires a multi-layered security approach. Key measures include:

• Regularly patching operating systems and applications, especially VPNs and email servers.
• Implementing multi-factor authentication (MFA) for all remote access and administrative accounts.
• Training employees to recognize phishing emails and avoid clicking on suspicious links.
• Maintaining offline, immutable backups that are tested regularly.
• Segmenting networks to limit lateral movement.
• Monitoring for unusual activity, such as mass file encryption or PowerShell execution.

If an attack occurs, isolate affected systems immediately, do not pay the ransom without consulting law enforcement, and engage a professional incident response team.

Frequently Asked Questions

What is the Gentlemen ransomware group?

The Gentlemen group is a ransomware-as-a-service operation that emerged in late 2023. They encrypt victims’ files and steal data, then demand a ransom for decryption and to prevent data leaks. They primarily target small and medium businesses in the U.S. and Europe.

How much ransom does Gentlemen typically demand?

Ransom demands range from $10,000 to $500,000, with a median of around $100,000. The amount is often based on the victim’s revenue and industry. Payments are usually requested in Bitcoin or Monero.

Should I pay the ransom if my company is attacked?

Law enforcement agencies advise against paying, as it encourages further attacks and does not guarantee data recovery. However, each situation is unique. Consult with cybersecurity professionals and law enforcement before making a decision.

Can the Gentlemen ransomware be decrypted for free?

In some early versions, decryption was possible due to a flaw in the encryption process. However, newer versions have fixed this, and there is no public decryptor available. Relying on backups is the most reliable recovery method.

How does the Gentlemen group gain initial access?

The primary method is phishing emails with malicious attachments. They also exploit known vulnerabilities in internet-facing applications like Microsoft Exchange and Fortinet VPNs. Once in, they use legitimate admin tools to move laterally.

What industries are most at risk?

Healthcare, manufacturing, and professional services are the top targeted industries. These sectors often have valuable data and may be more likely to pay quickly to avoid disruption.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2