Exploring the CAPI Backdoor: A New Threat Targeting Russian Auto and E-Commerce Sectors

Warning symbols over laptop indicating CAPI Backdoor malware attack.

Understanding the CAPI Backdoor Threat

Cybersecurity researchers have identified a new and sophisticated threat named the CAPI Backdoor, specifically targeting the Russian automotive and e-commerce sectors. This malware, which utilizes the .NET framework, primarily spreads through phishing emails containing ZIP files.

The Mechanism of Infection

The attack chain begins with a phishing email that lures victims into downloading a ZIP archive titled Перерасчет заработной платы 01.10.2025, which translates to “Payroll Recalculation as of October 1, 2025.” Inside this archive is an LNK file masquerading as a document related to income tax legislation. Once executed, this file triggers the installation of the .NET implant known as adobe.dll using a legitimate Windows binary called rundll32.exe, demonstrating a technique termed Living-off-the-Land (LotL).

Capabilities and Objectives of CAPI Backdoor

The CAPI Backdoor is not just a mere data-stealer; it operates stealthily with a range of functions. It checks for administrative privileges, identifies installed antivirus software, and opens the decoy document to mislead users while it covertly collects sensitive data. Its ability to handle tasks like screen capturing, browser data theft from Google Chrome, Microsoft Edge, and Firefox makes it particularly dangerous. Furthermore, it establishes persistence by setting up scheduled tasks, ensuring it remains operational even after system reboots.

Insights About the Threat Actors

Researchers attribute this campaign to a targeted effort against the Russian automotive sector, evidenced by the domain carprlce.ru, which mimics a legitimate site. Seqrite Labs' analysis has raised alarms regarding the sophistication of this threat, with the backdoor exhibiting advanced capabilities such as gathering host information and determining if it is running in a virtual environment. This strategic development underscores the need for robust cybersecurity measures, especially in vulnerable industries.

Importance of Awareness and Prevention

Given the evolving landscape of cyber threats, it is crucial for organizations to be vigilant. Training employees to recognize phishing attempts and deploying strong security protocols can reduce the risk of falling prey to attacks like those posed by the CAPI Backdoor. Regularly updating system security and educating teams about current threats are vital steps in fortifying defenses.

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Exploring the CAPI Backdoor: A New Threat Targeting Russian Auto and E-Commerce Sectors

Understanding the CAPI Backdoor Threat

The Mechanism of Infection

Capabilities and Objectives of CAPI Backdoor

Insights About the Threat Actors

Importance of Awareness and Prevention

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