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Stubborn Trojan horse Generic25.BXXH

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#1 yaddayadda93


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Posted 17 November 2011 - 06:09 PM

Working for three days on a friend's computer, and I still can't get rid of one last bug.

Dell Studio XPS 8000
Intel Core i7 2.8GHz
Windows 7 Ultimate 64-bit

He brought the computer to me for two main problems:
1) Random music and ads would play in the background when he would go to certain web sites, especially You Tube. I believe he was using IE6 at the time.
2) Browsers would redirect to alternate sites when he entered search terms in Google.
**) I've also noticed that the computer makes a funny electronic "sighing" noise as the OS shuts down and a funny voooom-pop noise when the OS loads (after the Windows four-note chime and toward the end of the boot cycle). I'm not familiar with Windows 7 enough to know if that's normal, but I suspect its not.

When he brought it to me, he did not have a current anti-virus program on the machine (his Norton subscription had expired). He also spends a lot of time on Eurpean/German web sites.

So far, I've:
* Uninstalled Internet Explorer, Firefox and Chrome using CCleaner.
* Reinstalled Chrome and changed settings to reject third-party cookies.
* Cleaned up a lot of other problems with CCleaner, including a ton of tracking cookies, orphaned dll files, etc.
* Installed a number of anti-virus programs. Yes, I know you're not supposed to run more than one at a time, but the bugs in question were not all being caught by a single program. Once the computer is clean, I will uninstall all but Microsoft Security Essentials, which has kept my own computer clean for more than a year.
* Turned System Restore off based on advice from Google search results. This makes me REALLY nervous and I'd like to turn it back on ASAP.

Results from various scans:
* Microsoft Security Essentials: no problems.
* MalwareBytes: no problems.
* Online scan from eset.com: No problems.
* TrendMicro House Call: no problems.
* SpyBot S&D: no problems.
* AdAware: no problems.
* AVG System TuneUp: no problems.
* AVG: I consistently get two errors: 1) A green checkmark (indicating that AVG has fixed the problem) in front of a file listed as "C:\Windows\explorer.exe (3236)" with a file type of "Trojan horse Generic25.BXXH" and 2) a red X (indicating that AVG has not fixed the problem) in front of a file listed as "C:\Windows\explorer.exe (3236):\memory_00d30000", with a file type of "Trojan Horse Generic25.BXXH". AVG offers a "Clean selected file" button (or something like that), but nothing happens when you click on that button. I get the same results when I run the scan in Safe Mode, too.
** NOTE: In the AVG scan results, the numbers inside the parentheses (3236) and the numbers after the word "memory" (00d30000) change with every new scan.

Where I am today:
1) I think I've killed the redirect bug, but only because I haven't tested it that much and because I've not reinstalled Internet Explorer yet. The few searches I've done at google.com while using Chrome have all been fine.
2) The strange "vooooom-pop" sound on start-up and "sighing" sound on shut down do not happen when I start in Safe Mode, but they do happen on regular start up.
3) The random music and ads are no longer playing through the speakers, but I suspect that's only because I'm not using Internet Explorer. I strongly suspect the strange start-up and shut-down sounds are related to the music and the Trojan Horse Generic25.BXXH, and I suspect that if I were to install and use IE, it would start all over again.
4) The nit-picker in me wants that "Trojan horse Generic25.BXXH" to go away and ALL scans to come back clean.

Soooooo ......

Any thoughts on how to kill that bug?

Thanks in advance.


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#2 Broni


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Posted 17 November 2011 - 08:41 PM

With the information you have provided I believe you will need help from the malware removal team.
Please make sure that you read the information about getting started first.
Then start a new thread HERE and include or required logs.
Including a link to this thread will be helpful.

Good luck and be patient. Help is on the way!

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#3 Orange Blossom

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Posted 18 November 2011 - 05:32 PM


Now that you have posted a log here: http://www.bleepingcomputer.com/forums/topic428426.html 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 MRT Team member, nor should you 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 MRT 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 MRT 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 MRT 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 MRT Team member is already assisting you and not open the thread to respond.

Please be patient. It may take several days to get a response but your log will be reviewed and answered as soon as possible. I advise checking your topic once a day for responses as the e-mail notification system is unreliable.

If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.

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

Orange Blossom :cherry:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

Orange Blossom

An ounce of prevention is worth a pound of cure

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