False positive--rogue installer?

[prr]

Below are the results from a recent scan. At least one of the 2 infections was from Filezilla, an FTP client. I'm wondering if something in that program triggered the identification of this as malware, esp. because Avast antivirus (running in the background) and several recent scans from Symantec's online scanner didn't pick this up. I don't recall updating Filezilla in months if not longer than that (I uninstalled it for good measure, just to be sure), or else I'd look in the Program Files folder. Was this really malware?

Malwarebytes' Anti-Malware 1.30

Database version: 1321

Windows 5.1.2600 Service Pack 3

10/25/2008 6:48:52 PM

mbam-log-2008-10-25 (18-48-52).txt

Scan type: Full Scan (C:\|D:\|)

Objects scanned: 104396

Time elapsed: 1 hour(s), 57 minute(s), 40 second(s)

Memory Processes Infected: 0

Memory Modules Infected: 0

Registry Keys Infected: 1

Registry Values Infected: 0

Registry Data Items Infected: 0

Folders Infected: 0

Files Infected: 1

Memory Processes Infected:

(No malicious items detected)

Memory Modules Infected:

(No malicious items detected)

Registry Keys Infected:

HKEY_CLASSES_ROOT\CLSID\{db70412e-eec9-479c-bba9-be36bfdda41b} (Rogue.InstantAccess) -> Quarantined and deleted successfully.

Registry Values Infected:

(No malicious items detected)

Registry Data Items Infected:

(No malicious items detected)

Folders Infected:

(No malicious items detected)

Files Infected:

C:\Program Files\FileZilla FTP Client\fzshellext.dll (Rogue.InstantAccess) -> Quarantined and deleted successfully.

[nosirrah]

I need a dev log please :

http://www.malwarebytes.org/forums/index.php?showtopic=3228