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Firefox google ads replacement malware?

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I believe I got infection in my PC now.   Win 8.1 pro 64 bit

The problem so far found on Firefox (30.0) only.   Firefox has Ad Block Plus plugin installed


  • When browsing site that have google ads banner (I live in japan so I expect to see some Japanese site ads) ,
    the banners will be replaced into some Russian or greek language ? banner

    with same sites, browsing with IE or chrome get correctly google ads banner.

  • When browsing site that don't have  google ads banner,  warning popup may be shown.  firefox may freeze after popup shown
    and it always re-pop after click stop script or continue

  • I tried to scan with Malwarebytes Anti-Malware (Free edition) , it always found PUP.Optional.Delta.A at "C:\Users\my name\AppData\Roaming\Mozilla\Firefox\Profiles\bevxfsct.default\prefs.js"
    (after saw replaced banner in firefox)​​
  • Scan with Avast (Free), AVG (Free), Windows Defender returned nothing much .....


Thank you in advance for any help.


Best regards,





FRST file here

Addition file here





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  • 4 weeks later...
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