How to remove Trojan infections

Discussion in 'BlackHat Lounge' started by rudyvise, May 27, 2009.

  1. rudyvise

    rudyvise Jr. VIP Jr. VIP

    Jul 6, 2008
    Likes Received:
    Corporate Copywriter
    How to remove these infections

    If you have identified the particular program that is part of the malware, and you want to remove it, please follow these steps.

    1. Download and extract the Autoruns program (below) by Sysinternals to C:\Autoruns

    2. Reboot into Safe Mode so that the malware is not started when you are doing these steps. Many malware monitor the keys that allow them to start and if they notice they have been removed, will automatically replace that startup key. For this reason booting into safe mode allows us to get past that defense in most cases.

    3. Navigate to the C:\Autoruns folder you created in Step 1 and double-click on autoruns.exe.

    4. When the program starts, click on the Options menu and enable the following options by clicking on them. This will place a checkmark next to each of these options.

    1. Include empty locations

    2. Verify Code Signatures

    3. Hide Signed Microsoft Entries

    5. Then press the F5 key on your keyboard to refresh the startups list using these new settings.

    6. The program shows information about your startup entries in 8 different tabs. For the most part, the filename you are looking for will be found under the Logon or the Services tabs, but you should check all the other tabs to make sure they are not loading elsewhere as well. Click on each tab and look through the list for the filename that you want to remove. The filename will be found under the Image Path column. There may be more than one entry associated with the same file as it is common for malware to create multiple startup entries. It is important to note that many malware programs disguise themselves by using the same filenames as valid Microsoft files. it is therefore important to know exactly which file, and the folder they are in, that you want to remove. You can check our Startup Database for that information or ask for help in our computer help forums.

    7. Once you find the entry that is associated with the malware, you want to delete that entry so it will not start again on the next reboot. To do that right click on the entry and select delete. This startup entry will now be removed from the Registry.

    8. Now that we made it so it will not start on boot up, you should delete the file using My Computer or Windows Explorer. If you can not see the file, it may be hidden. To allow you to see hidden files you can follow the steps for your operating system found in this tutorial:

    How to see hidden files in Windows

    9. When you are finished removing the malware entries from the Registry and deleting the files, reboot into normal mode as you will now be clean from the infection.

    Courtesy of a tutorial on bleeping computer...


  2. gimme4free

    gimme4free Executive VIP Premium Member

    Oct 22, 2008
    Likes Received:
    You can also check what starts up on your PC by going:
    Start>Run Type in msconfig.exe and press enter, click Startup. Here uncheck unwanted processes. Also helps for stopping shitty applications starting up with your PC, E.g. ituneshelper, realplayerupdates and loads of other crap.
  3. MrE

    MrE Executive VIP

    Sep 16, 2008
    Likes Received:
    This won't stop a nasty rootkit, just wipe your machine to be safe.

    You never know what may still be on there.
  4. sikx

    sikx Registered Member

    Jan 4, 2009
    Likes Received:
    An excellent tool to trace and remove rootkits is RkUnhooker, it will show you whichever system functions are hooked, find hidden files & drivers and allow you to wipe these files.
    Please make sure you know what you are doing before randomly killing and deleting things with it though, it is a very powerful tool.