Porblem: Trojan Horse IRC - BackDoor.SdBot4.LHN

Hello,

First of all I'm not very good with this kind of things so I apologise if I say something wrong.

Yesterday I've received a warning message (on my laptop) from my anti-virus AVG 8 that there was a trojan detected Backoor.SdBot4.LHN in C:/Users/*/Documents/smss.exe . I chose to let AVG delete the threat. But shortly after another similar warning message followed now with this as path: C:/smss.exe . I let the AVG move it into VirusVault (= AVG's quarantine).
I ran a full system scan with AVG after it and it appeared clean (except for several tracking cookies). However, when today I inserted a memory stick into the laptop a new warning message poped up telling me that there was that same trojan (BackDoor.SdBot4.LHN) in the 2 following paths:
- F:/usb_smss.exe
- F:/autorun.exe
Once again I let AVG put it into VirusVault. But a new problem arose: now I cannot open my memory stick on my laptop. I get an error message: F:/ Application not found.
Here I must add the following: I have Total Commander on my laptop and with Total Commander I still can open my memory stick on the laptop, but not with Windows Explorer. Also, I inserted that memory stick into another computer which had the same version of AVG as my laptop and there were no warnings from the anti-virus and I could normally open the memory stick (laptop runs on Vista, that other pc runs on XP)
The fact that I couldn't open memory stick on my laptop freaked me out so I ran a system restore using restore point created 2 days ago yet I still receive the same error when I try to open memory stick on the laptop.

Can you please help me make sure that the trojan is permanently deleted from my system and fix the problem about not being able to open a memory stick?

If needed, please tell me what extra information you need.

Thank you

 

Uhm, I couldn't find the button to edit my post, so I'm sorry about posting a small update on my situation this way

Update: after I wrote this post I left my laptop in "Sleep" for couple of hours. I just turned it back on and now suddenly I can open my memory stick with Windows Explorer without any problems it seems

 

Once again I'm sorry for updating my topic like this. Either I'm blind either there is really no "Edit"-button here

Anyway, here a small update on my situation:

I followed some steps my friend suggested me, here they are:
- I formated that memory stick that was causing problems (before that I've copied all the files on the stick to my hard drive as back up, that was my idea )
- I started my laptop in Safe Mode and ran full scans by both Malewarebytes' Anti-Malware and AVG8. Both came up clean, no threats detected (I'll copy-paste the log of Anti-Malware, can't find the log that AVG created while scanning in save mode)
So everything looks fine now, but to be sure I'd like to hear your opinion.
Tell me if you need me to do something extra and/or provide some extra information

Thanks for spending time reading all this

Malwarebytes' Anti-Malware 1.37
Database version: 2223
Windows 6.0.6001 Service Pack 1

4/06/2009 18:35:47
mbam-log-2009-06-04 (18-35-47).txt

Scan type: Quick Scan
Objects scanned: 1716
Time elapsed: 21 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

 

Hi,

Sorry for such a slow reply, I have been very busy with my work and had little access to this computer. The logs will be coming up this afternoon.

Thank you for your time and patience

 

I'm back. Here are the logs from MBAM, SAS and ComboFix.

By the way, a little "confession": I've also posted my problem on GeeksToGo.com . No offence or anything, I just get very nervous in situations like this and I was looking for multiple opinions just to be sure The guys there also told me to run Flash_Disinfector after ComboFix since I had couple of memory sticks infected.
I hope it's alright for you

Anyway here are the logs and thanks a lot for your help

 

Owkey

I'll go with GeeksToGo since I have couple of small extra questions for them concerning Flash_Disinfector besides the trojan-thingy.

Thanks for your patience with me , I appreciate it