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Luder Infection


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#1 Kupuham

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Posted 20 March 2008 - 10:21 AM

Hi there,
Im running Windows XP SP2, and avast!, since last morning there have been multiple detections of an unspecified variation of the Luder worm. Since I saw the warning before having to leave, I couldn't do much then.
So, all I did was disconnec the computer from my home network.

As for other AV programs, I have ZoneAlarm Pro, a, Ad-Aware, Spybot, CCleaner and SpywareBlaster. Unfortunately, I haven't run active scans for 1-2 weeks, as I am not using that machine so much, after I bought a new one.

After doing a Google search for the virus, I saw that Dr.Web Scanner was quite recommended, and the results were:
6 instances of "Trojan.Starter.171", which is apparently another name for Luder.
1 Backdoor and a Dloader, apparently from a heuristic analysis (on a hidden folder which I didn't recall existing)
1 "Program.PopcapLoader (for pop-ups? None showed up)

Later, I did a full scan with avast! and it found 300+ detections on exes and etc.

Also, is it possible that I got this from a shared network connection? Because my internet connection setup is a bit weird: We have a shared internet link, which is then shared in a network, allowing all the condos a connection. It is, at least without specific tools, impossible to access other computers shared folders & etc, but I can "see" them on the network. And, in addition to that, I have a network switch(not router), which then divides this connection further, so I can have 2 computers online.

It seems you guys are very busy, is there another forum you can recommend?

Edited by Kupuham, 20 March 2008 - 10:32 AM.


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#2 quietman7

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Posted 20 March 2008 - 11:40 AM

You have a real nasty infection on your system. Luder is a file infector which infects .exe, .rar, .scr files, downloads more malicious files to your system and can open a back door that compromises your computer. In many cases the infected files cannot be deleted and anti-malware scanners cannot disinfect them properly. When disinfection is attempted, the files become corrupted and the system may become irreparable. There are several variants of Luder which spreads via shared networks and email attachments.

If your computer was used for online banking, has credit card information or other sensitive data on it, you should immediately disconnect from the Internet until your system is cleaned. All passwords should be changed immediately to include those used for banking, email, eBay and forums. You should consider them to be compromised. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. Banking and credit card institutions should be notified of the possible security breach.

Many experts in the security community believe that once infected with this type of malware, the best course of action is to reformat and reinstall the OS. Please read "When should I re-format? How should I reinstall?".

Should you decide not to follow that advice, you can try the AVG I-Worm/Luder Remover. Follow the instructions exactly as specified and pay close attention to the instructions including the note on administrator rights. If this removal tool does not help, then further investigation will be required by creating and posting a hijackthis log. If that is the case, please reply back here so we can provide instructions on how to do that.
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#3 Kupuham

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Posted 20 March 2008 - 05:06 PM

I ran the remover, but it didn't produce any results, it just ran for a (quite long) while, I couldn't find a log.
So now I am running it again, to see if I get a log this time.
But, for what I see until now, it is not healing any files, so I guess my variant is imune to that solution :thumbsup:

Edit:And now again, I looked towards this screen, and when I looked back, the scanner was gone, no log files or error messages. This is getting seriously weird.

Edited by Kupuham, 20 March 2008 - 05:09 PM.


#4 quietman7

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Posted 20 March 2008 - 06:04 PM

Please see the pinned topic titled "Preparation Guide For Use Before Posting A Hijackthis Log". In step #9 there are instructions for downloading HijackThis and creating a log. (This is a self-extracting version which will automatically install the current version of HJT in the proper location.) If using Windows Vista, be sure to Run As Administrator.

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. Please include the top portion of the HijackThis log that lists version information. 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.

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?".
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