Guest guest Posted January 27, 2004 Report Share Posted January 27, 2004 W32.Novarg.A@mm Discovered on: January 26, 2004 Last Updated on: January 26, 2004 06:08:08 PM W32.Novarg.A@mm is a mass-mailing worm. The worm will arrive as an attachment with a file extension of .bat, .cmd, .exe, .pif, .scr, or .zip. The worm also contains functionality to perform as a proxy server. It listens on all TCP ports in the range 3127-3198. The worm will perform a DoS starting on February 1, 2004. On February 12, 2004 the worm has a trigger date to stop spreading. Note: Symantec Consumer products that support Worm Blocking functionality automatically detect this threat as it attempts to spread. Also Known As: W32/Mydoom@MM [McAfee], WORM_MIMAIL.R [Trend] Type: Worm Infection Length: 22,528 bytes Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP Systems Not Affected: DOS, Linux, Macintosh, OS/2, UNIX, Windows 3.x Virus Definitions (Intelligent Updater) * January 26, 2004 Virus Definitions (LiveUpdate™) ** January 26, 2004 * Intelligent Updater definitions are released daily, but require manual download and installation.Click here to download manually. ** LiveUpdate virus definitions are usually released every Wednesday.Click here for instructions on using LiveUpdate. Wild: Number of infections: More than 1000 Number of sites: More than 10 Geographical distribution: Medium Threat containment: Easy Removal: Moderate Threat Metrics Wild:High Damage:Medium Distribution:High Damage Payload Trigger: n/a Payload: n/a Large scale e-mailing: Sends to email addresses found in a specified set of files. It ignores email addresses that end in .edu. Deletes files: n/a Modifies files: n/a Degrades performance: Performs DoS against www.sco.com. Causes system instability: n/a Releases confidential info: n/a Compromises security settings: Allows unauthorized remote access. Distribution Subject of email: Varies Name of attachment: Varies with an extension of .pif, .scr, .exe, .cmd, .bat, or .zip Size of attachment: 22,258 bytes Time stamp of attachment: n/a Ports: TCP 3127-3198 Shared drives: n/a Target of infection: n/a When W32.Novarg.A@mm is executed it does the following: Creates the following files: "shimgapi.dll" in %System% "Message" in %temp%. This file is full of random letters and is displayed via Notepad. "taskmon.exe" in %System%. If a copy of taskmon.exe exists in the %System%, it is overwritten and replaced by this copy of the worm. Shimgapi.dll acts as a proxy server. It opens TCP ports in the range of 3127 to 3198 for listening. Adds the valueTaskMon = %System%\taskmon.exeto the registry keysHKEY_CURRENT_USER\Software\Microsft\Windows\CurrentVersion\RunandHKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run Can perform a Denial of Service against www.sco.com. Creates 64 threads which send GET requests. The DoS is active between February 1, 2004 and February 12, 2004. Creates the following registry keys:HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\VersionandHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\Version Searches for email addresses in files with the following extensions. It ignores addresses which end in ".edu". ..htm .sht .php .asp .dbx .tbb .adb .pl .wab .txt Attempts to send emails by using its own SMTP engine. It performs a lookup of the mail server of the recipient in order to send. If it is unsuccessful it will use the local mail server. The email will have the following characteristics:From: may be a spoofed from addressSubject:testhihelloMail Delivery SystemMail Transaction FailedServer ReportStatusErrorMessage:Mail transaction failed. Partial message is available.The message contains Unicode characters and has been sent as a binary attachment.The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment.Attachment:documentreadmedoctextfiledatatestmessagebodywith one of the following suffixes:pifscrexecmdbatzip Copies itself to KaZaA download directory as one of the following files: winamp5 icq2004-final activation_crack strip-girl-2.0bdcom_patches rootkitXP office_crack nuke2004 with a file extension of pif scr bat 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. 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. Run a full system scan and delete all the files detected as W32.Novarg.Amm (DOT) Delete the value that was added to the registry.For specific 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" Note: When you are completely finished with the removal procedure, and you are satisfied that the threat has been removed, you should reenable System Restore by following the instructions in the aforementioned documents. 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 definitionsSymantec 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. Scanning for an d 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 W32.Novarg.A@mm, click Delete.4. Deleting the value from the registry WARNING: 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 keys:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunandHKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run In the right pane, delete the value:"Taskmon"="%System%\taskmon.exe" Navigate to the keyHKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\Versionand delete it. Navigate to the keyHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\Versionand delete it. Exit the Registry Editor. Write-up by: Ferrie -- ___________________________________________________________Sign-up for Ads Free at Mail.com http://www.mail.com/?sr=signup Quote Link to comment Share on other sites More sharing options...
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