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Episode Description – Technical Write-up for Defenders

FileFix is a social engineering technique that builds on a known phishing method used in past ransomware and credential theft campaigns. It replaces more technical-looking prompts with a trusted and familiar Windows interface, making the request feel routine to the victim. By leveraging normal user actions inside a trusted application, the attacker can initiate malicious activity without relying on exploits or suspicious file downloads.

Key Defensive Actions:

• Restrict or limit script execution policies, especially for PowerShell.
• Monitor for unusual process activity originating from trusted applications.
• Provide awareness training that warns against unusual instructions involving system navigation tools.
• Apply browser and email security controls to block interactions with untrusted domains.

Relevant Indicators:

• Unexpected process chains involving trusted applications and scripting engines.
• Unusual clipboard activity linked to browser interactions.
• Alerts for suspicious commands that originate outside of normal administrative workflows.

Detection and Monitoring Tips:

• Configure EDR/SIEM to flag scripting processes spawned by user-facing applications.
• Enable detailed command-line auditing and review logs regularly.
• Restrict high-risk browser functions when accessed from corporate devices.

Known Infrastructure & Techniques:

• Inspired by research into variations of the ClickFix phishing method.
• Previously seen in campaigns attributed to ransomware operators and state-sponsored groups.

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