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Trojan Backdoor.win32.poison.dbc


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#1 trulymadlyforyou

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Posted 12 June 2008 - 01:45 PM

Hello,

Just Joined this forum......Its gr8.......

Since two days back my anti virus(kaspersky) started detecting a trojan program namely, Trojan Backdoor.Win32.Poison.dbc and this detection occurs everytime I restart my laptop. The infection gets detected and after I select it to be deleted in Kaspersky, it states that the infection is neutralized but will be deleted when ur computer is restared . So I restart it again but as it happens the same trojan again gets detected and the procedure continues. But if i just continue using without restarting, but of course neutralizing the threat, I dont seem to get any problem(I guess so). But obviously I would want the trojan to be cleared.

Anyways, the trojan always is detected in the temporary file folder, that is, C://Documents and settings/User1/Local Settings/Temp.

The file getting infected is of the form - C://Documents and settings/User1/Local Settings/Temp/ followed by some 10 digit number and .exe extension.

I am having Windows XP professional service pack 3 installed on my laptop. And I hav Kaspersky antivirus as well. Besides these I hav also tried AVG Anti Spyware and Ad-Aware programs.

I just now ran COMBOFIX. After finishing with it and restarting the trojan was again detected at startup. I dont seem to understand how the trojan gets started at startup and with what file it is linked to or whatever is happening. I do not have much knowledge regarding this subject and I hope to get some help from experienced users in the forum.

Please reply and if u need any further information or the log file or reports of detections let me know.

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#2 Budapest

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Posted 12 June 2008 - 06:14 PM

You should not run ComboFix unless instructed to do so by a malware removal expert. It can really mess up your system if you're not careful.

Run a full system scan with Malwarebytes' Anti-Malware in Normal Mode.

Then run a full system scan with SuperAntiSpyware in Safe Mode.

How to start Windows in Safe Mode
The power of accurate observation is commonly called cynicism by those who haven't got it.

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#3 quietman7

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Posted 12 June 2008 - 10:09 PM

Go to jotti's virusscan or virustotal.com. In the "File to upload & scan" box, browse to the location of the suspicious file(s) and submit (upload) it for scanning/analysis.
-- Post back with the results of the file analysis.
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#4 trulymadlyforyou

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Posted 13 June 2008 - 05:03 PM

Hiii,

I downloaded the two softwares you mentioned in the first reply, malwarebytes' anti malware, ran it in normal mode, then also ran superantispyware in safe mode. Superantispyware detected some tracking cookies.But again after restarting my comp the kaspersky detected the trojan program.

I am now running asquared anti malware program from EMSISOFT.

Surely i ll check out the virustotal website and upload the analysis.

Thanks a lot for supporting. I ll keep posting. Do reply.

#5 trulymadlyforyou

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Posted 13 June 2008 - 05:32 PM

Go to jotti's virusscan or virustotal.com. In the "File to upload & scan" box, browse to the location of the suspicious file(s) and submit (upload) it for scanning/analysis.
-- Post back with the results of the file analysis.




According to the last detection report, that is when I started my comp today, the file infected was - C:\DOCUME~1\User1\LOCALS~1\Temp\5629404381.exe
I couldnot load this file on virustotal. Its difficult to figure out which file from the temp folder where it is detected everytime, should I upload or whether it has got anything to do with it.

I am not able to understand which file might be infected. I coudnt find much information about this Trojan program Backdoor.Win32.Poison.dbc on the internet as well.
I guess it attaches itself to a program that starts at system startup. But Iam not able to figure out which file or program is infected.

I have till now used 8 antispyware anti malware programs but nothing could detected or repair. After every scan thr trojan gets detected at next system startup.
These are th programs I have used so far:
Antivirus Kaspersky
AVG AntiSpyware
Lavasoft Ad-Aware
MalwareBytes' Anti-Malware
SuperAntiSpyware
COMBOFIX
Spybot Search n Destroy
Grisoft vcleaner

And at the time of writing, EMSISOFT a-squared Anti Malware. It is still scanning and has detected 140 objects. The top 139 objects are of the format Trace.Registry.XXXX and a few tracking cookies.
And the last one is Riskware.Monitor.Win32.ActiveKeylogger.24

#6 trulymadlyforyou

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Posted 13 June 2008 - 06:42 PM

I ran HijackThis as well. I posted it on a HJT log analyzing site http://www.hijackthis.de and got the analysis. Shall I post the log file?.

I also got detected another trojan by EMSISOFT a-squared Anti malware: Backdoor.Win32.Hupigon.dkl. Deleted the file.

Also there is a winflashguard.exe file in my C directory.

Help needed, please reply.

#7 quietman7

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Posted 14 June 2008 - 06:46 AM

Online HijackThis analyzers rely on the user's ability to interpret the results and determine what needs to be fixed. However, they often provide misleading and/or questionable results. In my experience, they DO NOT always identify all the malware or all the files properly. They sometimes list legitimate files as bad and bad files as legitimate. They sometimes show entries with no file (file missing) as bad when that is not always the case.

Although these sites are open to the public, the user needs to know what they are doing and how to research the displayed log entries before using the original HijackThis application to fix anything. If you do not have advanced knowledge about computers or training in malware investigation, you should NOT fix anything with these analyzers without consulting a expert as to what to fix. Using this tool incorrectly could adversely impact your system.

Please read the pinned topic titled "Preparation Guide For Use Before Posting A Hijackthis Log" and complete all the steps. There are instructions for downloading and running Deckard's System Scanner (DSS) which will create a hijackthis log for you, or automatically download and install the most current version of HijackThis if it's not already installed on your computer.

When you have done that, post your log in the HijackThis Logs and Malware Removal forum, NOT here, for assistance by the HJT Team Experts. A member of the Team will walk you through, step by step, on how to clean your computer. If you post your log back in this thread, the response from the HJT Team will be delayed because your post will have to be moved. This means it will fall in line behind any others posted that same day.

Start a new topic, give it a relevant title and post your log along with a brief description of your problem, a summary of any anti-malware tools you have used and a summary of any steps that you have performed on your own. An expert will analyze your log and reply with instructions advising you what to fix. After doing this, we would appreciate if you post a link to your log back here so we know that your getting help from the HJT Team.

Please be patient. It may take a while to get a response because the HJT Team members are very busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT "bump" your post or make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond.
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#8 trulymadlyforyou

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Posted 14 June 2008 - 09:12 PM

Thanks a lot for your assistance.
I already have the HijackThis installed on m computer. I have posted the HJT log as you said, following all the instructions.

And although I have used so many Anti Malware tools, I have not at all attempted to change or fix any problem at ant point of time or after whatever recommendations I got after posting my HJT log and COMBOFIX log to some analysis site.

Here's the link to my HJT log report:

Backdoor Infection HJT log report

#9 Orange Blossom

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Posted 14 June 2008 - 09:18 PM

Hello trulymadlyforyou,

Thanks for posting back with the link to your new topic.

Now that you have an HJT log posted, you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a HJT Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the HJT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the HJT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond.

If after 5 days you still have received no response, then post a link to your HJT log in the thread titled "Haven't Had A Reply In Five Days?".

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :thumbsup:
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