MalwarePublished 21 Oct 2025Updated 20 Nov 2025

Privacy and Prizes: Rewards from a Malicious Browser Extension

Source AlienVault OTX General

Description

A unique phishing campaign has been identified, urging users to install a Chrome extension through an attached file. The threat actor entices victims with the promise of a $50,000 prize and privacy protection. The malicious extension, disguised as a MAC spoofer, actually captures user credentials when logging into various services. The campaign uses social engineering techniques and a seemingly legitimate domain to appear trustworthy. The extension is manually installed, bypassing the Chrome Web Store. Analysis of the extension's files revealed its true purpose of sending captured information to the attacker's server. This case highlights the importance of human analysis in detecting threats that bypass automated security solutions.

Impact

For European organizations, this threat poses a significant risk to user credential confidentiality, potentially leading to unauthorized access to corporate accounts, sensitive data breaches, and lateral movement within networks. The manual installation vector means that employees who are not adequately trained in cybersecurity awareness are vulnerable, increasing the likelihood of successful compromise. Credential theft can facilitate further attacks such as business email compromise, financial fraud, and espionage. The use of a seemingly legitimate domain and social engineering increases the risk of widespread infection, especially in sectors with high-value targets or those reliant on Chrome browser extensions. The exfiltration of credentials to attacker-controlled servers can also lead to regulatory compliance issues under GDPR, with potential fines and reputational damage. The threat’s medium severity reflects the need for vigilance but also indicates that exploitation requires user interaction, somewhat limiting its automatic spread.

Defensive guidance

European organizations should implement targeted user awareness training focusing on the risks of installing browser extensions from unverified sources and the dangers of phishing campaigns promising unrealistic rewards. Enforce strict policies that prohibit manual installation of browser extensions outside of the official Chrome Web Store and use enterprise browser management tools to whitelist approved extensions only. Deploy endpoint detection and response (EDR) solutions capable of monitoring and alerting on suspicious browser extension behaviors, including credential interception and network communications to unknown IP addresses. Regularly audit installed browser extensions across the organization to detect unauthorized additions. Implement multi-factor authentication (MFA) on all critical services to reduce the impact of credential theft. Network monitoring should include inspection of outbound traffic to detect communication with known malicious IPs such as 194.146.41.102. Finally, encourage reporting of suspicious emails or attachments and conduct phishing simulation exercises to reinforce user vigilance.

Indicators of compromise

IP addresses 1

194.146.41.102

Hashes 9

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aa5a66f28b015503b26e63c0c9922f74
ce9e91bd98c87974e9f458127eb80564
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1627aab619d90d9bcf99a56b2dec9773b5cdef228778407896d95c36fcadcfec
25bddf64acd086d0c1cfb1fceb60df60a377f9aa7492df77f2937be41298ac79
5fd98f27d03587115f0c2a3e16500416139783895fc2f0d21af6cfd9c042e520

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Description

AI analysisMachine-generated, updated 21 Oct 2025, 16:22 UTC

MITRE ATT&CK techniques8 from threat tags

Technical details

Indicators of compromise

IP addresses 1

Hashes 9

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