FileFix Malware — Security Threat Analysis Report by CyberDudeBivash

Published by CyberDudeBivash — Threat Intelligence & Cyber Defense
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Executive Summary

FileFix Malware is a newly identified malware strain designed to masquerade as a legitimate file-repair utility while delivering stealer and loader functions in the background. Once installed, FileFix harvests user credentials, manipulates system files, and installs secondary payloads — including ransomware and remote access trojans. Its key strength is social engineering, convincing users they are downloading a helpful “fix” for corrupted files.

CyberDudeBivash analysts confirm that FileFix campaigns are actively spreading via:

Malvertising (fake download ads).
SEO-poisoned “free repair tool” sites.
Phishing emails with attachments disguised as PDF/Word recovery tools.

Technical Capabilities of FileFix

Infostealer module — Harvests credentials from browsers, wallets, and saved sessions.
Loader module — Drops additional malware (including ransomware families).
Persistence — Registry run keys, scheduled tasks, and DLL sideloading.
Data manipulation — Encrypts or deletes certain local files under the guise of “repair.”
Exfiltration — Sends stolen data via HTTPS POST to attacker-controlled cloud servers.

Indicators of Compromise (IoCs)

File Paths

%APPDATA%\FileFixer\filefix.exe
%TEMP%\fixdoc_repairer.exe

Domains

fixdocs[.]help
free-filefix[.]download

Registry Keys

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\FileFixer

Detection & Hunting

Look for processes accessing multiple browser credential databases in quick succession.
Alert on unexpected outbound HTTPS POSTs to newly registered domains.
Monitor for persistence creation in registry with names resembling “File Repair/Helper.”

Mitigation Strategies

Block known IoCs at firewall/DNS level.
Educate users on malvertising risks and avoiding “free” file repair tools.
Enforce application allowlisting to block unapproved executables.
Deploy EDR rules for file modification masquerading as repair tools.

CyberDudeBivash Recommendations

Treat FileFix infections as precursors to larger compromises — often used by ransomware groups.
SOC teams should run full hunts for secondary payloads if FileFix is detected.
Enterprises must update phishing filters and ad-blocking policies to stop initial infection vectors.

CyberDudeBivash Services

IOC Packs (Sigma, YARA, Splunk)
Emergency Incident Response
Endpoint & Cloud Threat Hunting
User Awareness Campaigns

Contact: iambivash@cyberdudebivash.com

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