Stormous ransomware group lists www.danareksa.com on its leak site

• Ransomware group: Stormous
• Country: Indonesia
• Sector: Financial Services
• Announcement date: November 6, 2025

Stormous group targets Danareksa in new leak site announcement

The threat actor known as Stormous has announced a targeted attack against the Indonesian financial services firm Danareksa. According to an announcement published on the group's leak site on November 6, 2025, the group claims to have successfully obtained sensitive access information related to the organization's internal network infrastructure.

This type of announcement is a common tactic used by ransomware groups operating through dedicated leak sites. These platforms serve as a public stage where threat actors claim responsibility for breaches, often as a method of pressure during extortion attempts. In many modern ransomware campaigns, groups employ a strategy known as double extortion, where they not only encrypt an organization's systems but also threaten to release stolen data to increase their leverage during ransom negotiations.

The claim of unauthorized network access

The core of the claim made by Stormous involves the acquisition of VPN access credentials. These credentials are highly sensitive as they serve as a gateway for remote users to enter an organization's private internal network. By possessing these specific credentials, the threat actor alleges they have the means to bypass perimeter defenses and move within the company's digital environment.

While the group has made these claims publicly, it is important to note that the listing does not provide supporting evidence, such as screenshots or samples of the credentials, to verify the validity of the breach. The announcement serves as a claim of compromise rather than a confirmed forensic reality at this stage.

Details of the alleged data exposure

Regarding the specific contents of the alleged breach, the group's announcement is limited in scope. The listing names no specific data types or files, but it explicitly identifies the following as the subject of the claim:

• VPN access credentials for the company's internal network

No information was provided regarding the total volume of data stolen, the specific number of files involved, or any ransom demands associated with this specific incident.

About PT Danareksa

PT Danareksa is an Indonesian state-owned investment banking and financial services company. The company provides a wide range of specialized services, including asset management, securities, and advisory services, making it a significant entity within the Indonesian financial sector.

Security implications and defensive considerations

The potential exposure of VPN credentials poses a significant risk to an organization's security posture. Unauthorized access to an internal network can lead to a total compromise of network security, potentially serving as a precursor to broader data breaches or secondary attacks. Given that the Stormous group is known for politically motivated actions, this incident could potentially be used as a stepping stone for further malicious activities.

For organizations operating in the financial services sector, such incidents highlight the necessity of robust identity and access management. If a breach occurs, organizations may face legal notification requirements under local data protection regulations, such as those in Indonesia. To mitigate the risks associated with credential theft, security professionals generally recommend several defensive measures:

• Credential Reset: Immediately resetting all access credentials, especially those related to remote access gateways like VPNs.
• Network Restructuring: Reviewing and restructuring network security measures to limit lateral movement within the environment.
• Multi-Factor Authentication: Implementing strong multi-factor authentication (MFA) across all remote access points to ensure that stolen credentials alone are insufficient for entry.
• Continuous Monitoring: Enhancing monitoring of internal network traffic to detect anomalous behavior that might indicate an unauthorized user is present.

In summary, the claim by Stormous regarding Danareksa highlights the ongoing threat posed by credential theft and the critical importance of securing the gateways that connect remote users to sensitive internal environments.