Neuer Trojaner im IRC

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  • Qualität des Beitrags: 0 Sterne
  • Beteiligte Poster: st0rmchen
  • Forum: Ihr-Domainname.de
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  • aus dem Unterforum: Viren
  • Antworten: 1
  • Forum gestartet am: Dienstag 20.12.2005
  • Sprache: deutsch
  • Link zum Originaltopic: Neuer Trojaner im IRC
  • Letzte Antwort: vor 18 Jahren, 3 Monaten, 7 Tagen, 5 Stunden, 48 Minuten
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    Re: Neuer Trojaner im IRC

    st0rmchen - 20.12.2005, 17:43

    Neuer Trojaner im IRC
    Dies wird ein langer Tread :-Ein neuer Trojaner sorgt im Moment fuer Probleme im IRC.
    Bitte stellt alle sicher, dass Ihr nichts solches eingefangen habt und beratet die User, die sich mit Virus/Trojaner Problemen an Euch wenden (ich bin nicht der Virus Supporter vom Chat Wink.

    Zuerst mal die Info die ich von mk bekommen habe:

    Neuer Trojaner "Sdbot.N" aufgetaucht
    Von Martin FiutakZDNet22. Oktober 2003, 09:58 Uhr Panda-Software warnt vor gefährlichem IRC-Code

    Panda Software warnt von von einem neuen "potenziell gefährlichen" Trojaner mit dem Namen Sdbot.N (Bck/Sdbot.N). Der gefährliche Code erlaube Hackern den Zugriff auf infizierte Computer per IRC. Dabei muss nicht einmal ein entsprechender Client auf dem betroffenen Rechner installiert sein.

    "Der Autor von Sdbot.N hat den Trojaner in einer Serienmail-Aktion versendet", so die Virenexperten. Zu erkennen sei die verseuchte Nachricht an der Betreffzeile 'Microsoft Security Update' und am Datei-Anhang, der den Namen MS03-047.EXE trage.

    Im Nachrichtentext werde der Empfänger getäuscht, indem erklärt werde, dass diese eMail von Microsoft stammt. Nachdem Sdbot.N gestartet wurde erscheine die Meldung 'Update complete'. Der Trojaner erstelle mehrere Einträge in der Windows-Registry, um sicherzustellen dass er permanent präsent ist und erzeuge außerdem eine Datei mit dem Namen 'autoupdate.exe' im Windows Systemverzeichnis.

    Sdbot.N enthalte seinen eigenen IRC-Client um sich mit einem IRC-Channel verbinden zu können, falls der betroffene Computer keine IRC-Applikation installiert hat. "Diese Verbindung erlaubt es Hackern, den Computer fernzusteuern, um zum Beispiel Anweisungen an Scan-Ports zu geben, automatische Updates des Trojaners zu starten oder 'Denial of Service-Angriffe' vorzunehmen", so die Warnung.

    Diesen Artikel inklusive weiterfuehrender Links finden Sie unter
    http://www.zdnet.de/news/security/0,39023046,39116711,00.htm





    Technical Details

    When Backdoor.Sdbot.N is executed, it performs the following actions:

    Copies itself to %System%\Scvhost.exe.

    NOTES:
    %System% is a variable. The Trojan locates the System folder and copies itself to that location. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
    This should not be confused with the legitimate system file Svchost.exe.


    Adds the value:

    "Windows Service Host" = "scvhost.exe"

    to the registry keys:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersionRunServices


    Modifies the value:

    "Hidden" = "2"

    in the registry value:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersionExplorer\Advanced


    For further information, read the Backdoor.Sdbot writeup.

    RECOMMENDATIONS

    Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
    Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
    If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
    Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
    Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
    Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
    Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
    Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.

    REMOVAL INSTRUCTIONS

    The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

    Disable System Restore (Windows Me/XP).
    Update the virus definitions.
    Do one of the following:
    Windows 95/98/Me: Restart the computer in Safe mode.
    Windows NT/2000/XP: End the Trojan process.
    Run a full system scan and delete all the files detected as Backdoor.Sdbot.N.
    Reverse the changes that the Trojan made to the registry.

    For details on each of these steps, read the following instructions.

    1. Disabling System Restore (Windows Me/XP)
    If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

    Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

    Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

    For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
    "How to disable or enable Windows Me System Restore"
    "How to turn off or turn on Windows XP System Restore"

    For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder," Article ID: Q263455.

    2. Updating the virus definitions
    Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
    Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
    Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

    3. Restarting the computer in Safe mode or ending the Trojan process
    Windows 95/98/Me
    Restart the computer in Safe mode. All the Windows 32-bit operating systems, except for Windows NT, can be restarted in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."

    Windows NT/2000/XP
    To end the Trojan process:
    Press Ctrl+Alt+Delete once.
    Click Task Manager.
    Click the Processes tab.
    Double-click the Image Name column header to alphabetically sort the processes.
    Scroll through the list and look for Scvhost.exe.
    If you find the file, click it, and then click End Process.
    Exit the Task Manager.

    4. Scanning for and deleting the infected files
    Start your Symantec antivirus program and make sure that it is configured to scan all the files.
    For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
    For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan all files."
    Run a full system scan.
    If any files are detected as infected with Backdoor.Sdbot.N, click Delete.

    5. Reversing the changes made to the registry

    CAUTION: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.

    Click Start, and then click Run. (The Run dialog box appears.)
    Type regedit

    Then click OK. (The Registry Editor opens.)


    Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run


    In the right pane, delete the value:

    "Windows Service Host" = "scvhost.exe"


    Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersionRunServices


    In the right pane, delete the value:

    "Windows Service Host" = "scvhost.exe"


    Navigate to the key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersionExplorer\Advanced


    In the right pane, change the value to:

    "Hidden" = "1"


    Exit the Registry Editor.



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