Question

Backdoor.Bot infection

Asked by: canu

We recently ran Malwarebytes on some computers on our office network and found that they both had infections.

Please see a section of the log below:

Folders Infected:
C:\WINDOWS\temp\spoolsv (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\download (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\logs (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\sounds (Backdoor.Bot) -> Quarantined and deleted successfully.
 
Files Infected:
c:\WINDOWS\temp\spoolsv\spoolsv.exe (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\aliases.ini (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\control.ini (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\Desktop.ini (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\ident.txt (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\mirc.ico (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\remote.ini (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\servers.ini (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\users.ini (Backdoor.Bot) -> Quarantined and deleted successfully.
c:\WINDOWS\temp\spoolsv\xmas.jpg (Backdoor.Bot) -> Quarantined and deleted successfully

Both PCs are running Windows XP Professional SP3 and have AVG Anti Virus and Windows Defender installed and access the Internet using a router that uses NAT.
All programs are up to date as far as I'm aware.

Malwarebytes removed all traces of the infections after the PCs were rebooted.

My question is anyone have any idea how these PCs became infected?

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Asked On
2009-06-10 at 13:19:19ID24480910
Tags

backdoor

,

bot

,

virus

,

infection

Topics

Internet Security

,

Networking Security Vulnerabilities

,

Anti-Virus Applications

Participating Experts
5
Points
300
Comments
6

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Answers

 

by: EirmanPosted on 2009-06-10 at 13:26:12ID: 24595990

Most likely from visiting dodgey websites with an out-of-date browser. Stick with firefox, which updates very regularly

 

by: greenaspPosted on 2009-06-10 at 13:27:36ID: 24596010

It looks like Backdoor.Bot has not been added to AVG's def. files yet. Very common with spyware also.

 

by: warturtlePosted on 2009-06-10 at 13:47:00ID: 24596221

If someone in your office downloaded pirated software or cracked software, that could be another source of these infections.

Most likely, its from a website as already suggested. You might have noticed that sometimes when you are browsing a website, you suddenly start getting popups that attempt to show you that your computer is full of viruses and it needs cleaning, such website can often slip malware into your PC without your consent and install backdoors that can allow hackers to come in. I have seen quite a few of them myself, and they show as if they are scanning my computer for viruses and display 2 options 'Clean PC' or 'Cancel'. If you click on 'Cancel', it still is able to infect the PC.

MalwareBytes and SuperAntiSpyware are specialised for removing malware and act as a supplement to existing antiviruses such as AVG. Scanning with them once every week or so, should keep malware at bay, make sure to update them regularly though. Their free version doesn't have real-time protection, but their paid version does.

Hope it helps.

 

by: rpggamergirlPosted on 2009-06-10 at 20:48:52ID: 24598629

Common method of infection involved system/security exploits, users executing unknown programs, also get infected via email, hacked web-pages, IRC, P2P networks.
Will also spread via external drives.

Writeup of Generic BackDoor!d!
http://74.125.153.132/search?q=cache:k-F6hopSYWoJ:vil.nai.com/vil/content/v_158461.htm+C:%5CWINDOWS%5Ctemp%5Cspoolsv&cd=3&hl=en&ct=clnk&gl=au

 

by: xmachinePosted on 2009-06-10 at 23:45:33ID: 24599326

Hi,

You have many source of infections:

E-Mails, malicious web sites, music or video downloads, corrupt program downloads and any messenger service.


Symantec Certified Specialist

 

by: canuPosted on 2009-06-11 at 08:05:23ID: 31591076

Thanks for all of your help and observations, it's much appreciated!

20120131-EE-VQP-002

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