The threat described is a malspam campaign dated September 5, 2016, which distributes malware via email attachments. The campaign is named "Credit card receipt" and involves sending emails with a ZIP archive attachment containing a JavaScript (.js) file. When the recipient extracts and executes the .js file, it likely triggers malicious activity such as downloading additional payloads, executing scripts to compromise the system, or stealing sensitive information. The use of a ZIP archive helps evade basic email security filters by hiding the malicious script inside a compressed file. The campaign leverages social engineering by using a plausible lure—an email purporting to be a credit card receipt—to entice recipients to open the attachment. No specific malware family or payload details are provided, and there are no known exploits in the wild beyond this malspam distribution. The threat level is assessed as low, indicating limited sophistication or impact. The absence of affected software versions or patch links suggests this is a generic malware delivery method rather than a vulnerability targeting a specific product. Overall, this is a typical example of a commodity malware distribution campaign using social engineering and script-based payloads to infect victims.

For European organizations, this malspam campaign poses a risk primarily through user interaction—opening the malicious attachment. If successful, the malware could lead to data theft, system compromise, or further malware infection. The impact on confidentiality is notable if sensitive data is stolen, such as financial or personal information. Integrity and availability impacts depend on the payload executed by the JavaScript, which is unspecified but could include ransomware or backdoors. Given the low severity and lack of known exploits, the campaign likely targets a broad audience rather than specific high-value targets. However, organizations with less mature email filtering, user awareness, or endpoint protection could be more vulnerable. Financial institutions, retail companies, and any entities handling payment card data in Europe could be particularly interested targets due to the lure theme. The campaign's age (2016) suggests it may be less relevant today but could still inform awareness of similar tactics.

To mitigate this threat, European organizations should implement multi-layered email security controls that scan and block compressed archives containing executable scripts. Advanced sandboxing solutions can detect malicious behavior from JavaScript files before delivery. User awareness training should emphasize the risks of opening unexpected attachments, especially those claiming to be receipts or financial documents. Endpoint protection platforms should be configured to detect and block script-based malware execution. Network monitoring for unusual outbound connections can help identify infections early. Additionally, disabling Windows Script Host (WSH) where not required can reduce the risk of .js file execution. Organizations should enforce strict attachment handling policies, such as blocking or quarantining emails with .js files inside archives. Regular backups and incident response plans will help mitigate damage if infection occurs.