Jump to content


 


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Photo

Problem Removing Trojan Bho - Isign3.dll


  • Please log in to reply
1 reply to this topic

#1 cfcboc

cfcboc

  • Members
  • 1 posts
  • OFFLINE
  •  
  • Local time:04:50 PM

Posted 26 December 2007 - 01:48 AM

NOTE: I searched this site as well as Google searches but cannot find any references to this particular BHO trojan.

I've been struggling to remove a BHO trojan that has replaced a friend's c:\windows\system32\isign32.dll with a file called isign3.dll. What this DLL does is periodically redirects a browser session (either IE or Firefox) to various sites.

AVG keeps identifying the trojan and tries to heal it, but AVG cannot remove it.

I've tried SAFE mode, but this DLL loads in SAFE mode.

There are several entries in the registry for isign3.dll, but any attempt to modify or delete the entry is blocked with a no access error.

Hijack does not remove it. Autoruns doesn't appear to stop it from loading. It doesn't appear on any list of processes or services running.

I tried booting with DOS 6.22 to delete the file, but DOS only shows one .exe file on the C:\ drive (perhaps because my disk is formatted as NTFS?)

Has anybody encountered this problem or can suggest a way to remedy?

BC AdBot (Login to Remove)

 


#2 quietman7

quietman7

    Bleepin' Janitor


  • Global Moderator
  • 51,490 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Virginia, USA
  • Local time:06:50 PM

Posted 26 December 2007 - 10:44 AM

Please read and follow all instructions in the pinned topic titled "Preparation Guide For Use Before Posting A Hijackthis Log". You may have performed some of these steps already. If you can't perform a step, then skip and continue with the next. 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.
.
.
Windows Insider MVP 2017-2018
Microsoft MVP Reconnect 2016
Microsoft MVP Consumer Security 2007-2015 kO7xOZh.gif
Member of UNITE, Unified Network of Instructors and Trusted Eliminators

If I have been helpful & you'd like to consider a donation, click 38WxTfO.gif




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users