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repeated W97M/Adnel infections reported by win defender


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#1 M One

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Posted 01 March 2015 - 06:36 AM

Wonder if anyone can advise on this.

 

I'm setting up a new dell inspiron for friend. This is new clean box straight from Dell (refurb).

 

After several hours of updates and config windows defender reports:

 

W97M/Adnel infection in AppData\Local\Packages\microsoft.windowscommunicationapps_8wekyb3d8bbwe\Localstate\LiveCom\..........SCAN_20150224_100752437.xls.

 

Once defender quarantines it a full scan comes out clean. Malwarebytes including rootkit also comes out clean.

 

Then, after anything from a few minutes to an hour, defender pops up an alert and it's back again - not necessarily the same xls but varying named doc files in the same directory.

 

I have now done 2 complete clean installs from the recovery partition and each time towards the end of the configuration defender pops the alert again.

 

The only Office installation on the box is the trial that it came with and this hasn't been activated - so no office files have ever been opened on it. Mail is configured and working but has not been accessed (so no attachments opened) and the only additional software installed is Firefox, Malwarebytes and a reputable metro news apps (The Independent).

 

The only unknown is that when I am done setting up I plug an external HDD in to take a system image - is there any way this simple action (without knowingly launching any application or opening any file on it) could cause this infection if the external HDD is compromised?

 

At a loss and have spent 2-3 days on this as cannot give laptop to non technical friend with a potential malware issue.

 

Any advice greatly appreciated.

 

Mark

 

Note: Now also getting PWS:HTML/Phish.FL & Win32/Upatre alerts!


Edited by M One, 01 March 2015 - 06:43 AM.


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#2 M One

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Posted 02 March 2015 - 09:23 AM

FRST Log attached.

 

Issue ongoing.

 

Thanks



#3 M One

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Posted 02 March 2015 - 09:25 AM

Sorry - here.

Attached Files



#4 M One

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Posted 02 March 2015 - 03:16 PM

Have additional troubleshooting info:

 

It's nothing to do with connecting external hdd as have tested without doing so after system restore and no change.

 

I have run scans with GMER, aswMBR & Malwarebytes ANti Rootkit that don't seem to show anything unusual.

 

Trojan infected files are periodically appearing in subdirectories of:

 

AppData\Local\Packages\microsoft.windowscommunicationapps_8wekyb3d8bbwe\Localstate\LiveCom\9d8fa0f24982dacd\120712-0049\Att\

 

Following system restore this directory is empty but over time new subdirectories appear.

 

Examining the contents of these subdirectories suggests to me that they contain images and attachments from emails!

 

The only service that I have setup on this box is the Mail app - leading me to suspect that windows may be automatically downloading mail attachments to the directory above (explaining the Att name of the last subdirectory) which defender is then picking up.

 

I know nothing bout Win 8 - is it possible that the metro mail app is automatically downloading attachments in the background and storing them locally without user interaction?! Would seem to be a fundamentally flawed approach if it is.

 

Would appreciate any input - please?

 

Thanks


Edited by M One, 02 March 2015 - 03:17 PM.


#5 M One

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Posted 02 March 2015 - 06:56 PM

OK - so I seem to have confirmation from an MVP on the MS forums that the Win 8 mail app is automatically downloading any attachments that arrive in the mailbox without any user interaction.

 

So an infected file attachment is going to be downloaded to my pc in the background whether I like it or not and this is default behaviour which cannot be changed!??

 

This explains the Defender alerts of trojan infected office doc files on an otherwise factory default laptop.

 

Posting this for the benefit of anyone else who finds themselves chasing their tails on unsolicited files arriving in the /Att folder and being flagged by av.



#6 HelpBot

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Posted 06 March 2015 - 06:40 AM

Hello and welcome to Bleeping Computer!

I am HelpBot: an automated program designed to help the Bleeping Computer Staff better assist you! This message contains very important information, so please read through all of it before doing anything.

We apologize for the delay in responding to your request for help. Here at Bleeping Computer we get overwhelmed at times, and we are trying our best to keep up. Please note that your topic was not intentionally overlooked. Our mission is to help everyone in need, but sometimes it takes just a little longer to get to every request for help. No one is ignored here.

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