FileFix Malware — Security Threat Analysis Report by CyberDudeBivash | Published by CyberDudeBivash — Threat Intelligence & Cyber Defense

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FileFix Malware — Security Threat Analysis Report by CyberDudeBivash

 Published by CyberDudeBivash — Threat Intelligence & Cyber Defense
 cyberdudebivash.com | cyberbivash.blogspot.com | cryptobivash.code.blog

 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


#CyberDudeBivash #FileFix #MalwareAnalysis #Infostealer #ThreatIntel #CyberDefense #Malvertising #Loader #Ransomware #IncidentResponse

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