Custom scan cannot delete threat from Time Machine backup

Hello, Team!

My Computer Specs:

iMac Intel Desktop OS X Lion. Home Edition. Latest updates. (Auto-Updated daily). 

Two hard drives installed when purchased: Mac HD and HD 2.

HD 2 holds my backups:

2012-04-19 09:39:57 -0400 Threat: 'Mal/Iframe-F' detected in /Volumes/Macintosh HD 2/

I'm the Admin.  I set my mac to show all hidden files. 

No Windows software is being used.

Problem:

Finder alerted me that the file cannot be removed via Finder because it's in a backup file in Time Machine.

I am only using Sophos, (no other 3rd party A/V's, etc) which I just installed a few days ago, after the news briefs.

I did as thorough a search in the community forum for the Mac home edition, including advanced searches, as possible, to the best of my knowledge. 

I also read and absorbed this topic, but am holding off doing Andrew's "gutsy solution"  :smileyhappy: in case it is not relevant to this issue:

http://openforum.sophos.com/t5/Sophos-Anti-Virus-for-Mac-Home/Issues-with-deleting-some-malware-through-custom-scans/m-p/2941

Screenshot shows the issue, the custom scan, the instructions from Sophos and the threat itself.

I no longer have the account to which the cache files refer, so I cannot delete them that way. You'll see from the path.

I tried to find the exact cache file, by copying the entire string and got it to where i could create two custom scans. There are hundreds of cache files and I tried to find that single one, from within TIME MACHINE, but it became extremely difficult. Because of the difficulty of finding that one specific cache file, I created a custom scan that contains the direct folder that has these cache files. (Per other posts in this forum).  Thank you!

Quarantine Manager reported finding the following:

Threat:  Mal/Iframe-F

Clicking the threat brought me to the below page which says:

"Affected Operating Systems: Windows" 

That suggests I install your free Virus Removal Tool which, of course, I clicked on the Free Mac A/V for OS X link which brought me to the installer for the same software I'm using.

I am not using Windows (in case this matters).

http://www.sophos.com/en-us/threat-center/threat-analyses/viruses-and-spyware/Mal~Iframe-F.aspx

Threat:  Mal/Iframe-F

Aliases:Trojan-Downloader.JS.Iframe.bxs

Notes:  entered the word "blank" for user names, ID's and account names from the full paths for posting this info in the forum.

Quarantine Manager thorough paths reported:

Threat:  Mal/Iframe-F

Path and FN:

/Volumes/Macintosh HD 2/Backups.backupdb/Blank iMac/2011-11-29-131433/Macintosh HD/Users/blank/Library/Application Support/SecondLife/blank_resident/browser_profile/cache/http/cache_16a50254fb67a90aeabadc97f938534b767c87f1.cache

Action Available: The threat cannot be cleaned up. Please click the threat name above for manual cleanup instructions.

Followed Steps 11 through 15 from here:

KB: http://www.sophos.com/support/knowledgebase/article/112129.html

 Ran the CUSTOM SCANS six times, including overnight. Time Machine just stays there until I get out of it with ESC. 

The file does not get removed.

Log:

Sophos Anti-Virus

Product version: 8.0.2C

Detection engine version: 3.30.0

Detection data version: 4.76

Release date: 02 April 2012

Detects 3482976 threats

NSHumanReadableCopyright

Using IDE files:  **deleted for brevity**

CREATED CUSTOM SCAN and selected two paths to scan:

Scan name: "manual threat removal"

Scan items:

Path: /Volumes/Macintosh HD 2/Backups.backupdb/blank iMac/2011-11-29-131433/Macintosh HD/Users/blank/Library/Application Support/SecondLife/browser_profile/cache/http enabled: yes

Path: /Volumes/Macintosh HD 2/Backups.backupdb/Blank iMac/2011-11-29-131433/Macintosh HD/Users/blank/Library/Application Support/SecondLife/blank_resident enabled: yes

Configuration:

Scan inside archives and compressed files: Yes

Automatically clean up threats: Yes

Action on infected files: Delete

Live Protection enabled: Yes

Immediate scan started at 2012-04-19 09:39:38 -0400

2012-04-19 09:39:57 -0400 Threat: 'Mal/Iframe-F' detected in /Volumes/Macintosh HD 2/Backups.backupdb/Blank iMac/2011-11-29-131433/Macintosh HD/Users/blank/Library/Application Support/SecondLife/blank_resident/browser_profile/cache/http/cache_16a50254fb67a90aeabadc97f938534b767c87f1.cache

Clean up not available for this threat

Issue deleting threat

Scan completed at 2012-04-19 09:40:08 -0400.

3250 items scanned, 1 threats detected, 1 issues

I hope I provided enough info.  Thank you for your time and help!

Quandary