Cosmos Hotel Group listed on malas ransomware leak site

• Ransomware group: malas
• Country: Russia
• Sector: Hospitality
• Announcement date: April 9, 2023

Cosmos Hotel Group has been listed on the leak site of the ransomware group known as malas. The group claims that the organization is the target of a ransomware incident, asserting that the entity's data has been compromised and may be published if their demands are not met.

The details of the claim

According to the announcement made by the malas group, the incident involving Cosmos Hotel Group was facilitated through the exploitation of a vulnerability in Zimbra software. By listing the organization on their dedicated leak site, the group suggests that they have gained unauthorized access to the institution's environment. This type of activity is characteristic of modern ransomware operations, where threat actors often utilize known software vulnerabilities to gain an initial foothold within a corporate network.

Ransomware leak sites serve as a platform for these groups to exert pressure on their victims. In many cases, these groups employ a tactic known as double extortion. In this scenario, attackers do not just encrypt a victim's files to disrupt operations; they also exfiltrate sensitive data before the encryption occurs. The threat of releasing this stolen information on a public leak site is used as leverage to coerce the organization into paying a ransom. If the group's demands are not satisfied, they threaten to disclose the stolen information to the public or its stakeholders.

The scope of the data involved

Regarding the specific details of the breach, the listing provides no specific information regarding the nature of the compromised or threatened data. There is no information provided concerning the volume of data involved or the specific types of files that may have been accessed by the attackers.

The lack of specific details regarding the content of the data makes it difficult to immediately assess the full impact of the alleged breach. However, the mere threat of data disclosure remains a significant concern for the targeted entity.

The organization involved

Cosmos Hotel Group is a major hotel chain and management company based in Russia. The company operates and manages numerous hotels across the country, making it a significant player in the Russian hospitality sector.

Risk assessment and implications

This incident may pose a risk to the operational continuity of the organization. The exploitation of Zimbra vulnerabilities could potentially lead to unauthorized access to corporate email systems and the exposure of sensitive communications. Because email systems often serve as a central hub for corporate coordination, a compromise in this area can have wide-reaching consequences for internal operations.

If a data breach has occurred, the disclosure of personal information belonging to customers and employees could trigger legal processes under relevant data protection regulations. Furthermore, such leaks may create secondary risks, including identity theft and targeted phishing attacks. When sensitive communications or personal identifiers are exposed, they can be used by other malicious actors to conduct more sophisticated social engineering campaigns against the employees or clients of the affected organization.

To mitigate such risks, organizations in the hospitality sector and beyond can implement several defensive measures. Maintaining a robust patch management program is critical to ensure that software, such as Zimbra, is updated promptly to defend against known vulnerabilities. Additionally, implementing multi-factor authentication (MFA) across all corporate systems, particularly email and remote access points, can provide a vital layer of security against unauthorized access. Regular security awareness training for employees can also help reduce the likelihood of successful phishing attempts that often follow a data leak. Finally, maintaining offline, immutable backups is a fundamental practice for ensuring that an organization can recover its operations in the event of a ransomware attack.

Limited public information

It should be noted that information about the malas group is limited in the public domain, making it difficult to attribute the attack to a specific known threat actor profile with high certainty.