W32.Ganda.A@mm

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Discovered: March 17, 2003
Updated: February 13, 2007 11:44:32 AM
Also Known As: W32/Ganda@MM [McAfee], Ganda [F-Secure], Win32/Ganda.A@mm [RAV], W32/Ganda.A@mm [Norman], Win32.Ganda.A [CA], W32/Ganda-A [Sophos], PE_GANDA.A [Trend], I-Worm.Ganda [KAV]
Type: Worm
Systems Affected: Windows


W32.Ganda.A@mm is a mass-mailing worm that sends email to the contacts in the Windows Address Book. The worm contains its own SMTP engine and attempts to use the computer's default SMTP server, or an open mail server in Sweden, for email propagation.

W32.Ganda.A@mm sends two email messages with the following characteristics, in Swedish or English, depending on the infected systems' language:

Subject:
Swedish:

  • Olaglig_skärmsläckare?
  • Rashets eller inte?
  • Hakkors.
  • Suspekta semaforer.
  • Avskyvärd_reklam.
  • Överviktiga_förnedras.
  • Go ack ack ack....
  • Är_USA_ett_UFO?
  • Korkad president.
  • Katt, hund, kanin.
English:
  • Screensaver advice.
  • Spy pics.
  • GO USA !!!!
  • G.W Bush animation.
  • Is USA a UFO?
  • Is USA always number one?
  • LINUX.
  • Nazi propaganda?
  • Catlover.
  • Disgusting propaganda.

Attachment: [a-z][a-z].scr


The worm also attempts to terminate the services of several antivirus and security products.



This worm appears to have originated in Sweden.

Antivirus Protection Dates

  • Initial Rapid Release version March 17, 2003
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version March 17, 2003 revision 004
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date March 19, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Brian Ewell

Discovered: March 17, 2003
Updated: February 13, 2007 11:44:32 AM
Also Known As: W32/Ganda@MM [McAfee], Ganda [F-Secure], Win32/Ganda.A@mm [RAV], W32/Ganda.A@mm [Norman], Win32.Ganda.A [CA], W32/Ganda-A [Sophos], PE_GANDA.A [Trend], I-Worm.Ganda [KAV]
Type: Worm
Systems Affected: Windows


When W32.Ganda.A@mm is executed, it does the following:

  1. Creates a Mutex with the name SWEDENSUX.
  2. Copies itself to:
    • %WinDir%\scandisk.exe
    • %WinDir%\[8 random characters a-z].exe
    • %WinDir%\tmpworm.exe

      NOTE: %WinDir% is a variable. The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.

  3. Appends code to execute itself to the .exe and .scr files.
  4. Adds the registry value:

    ScanDisk %WinDir%\SCANDISK.exe

    to the registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs when you start Windows.
  5. Terminates all the services that contain the following strings:
    • virus
    • firewall
    • f-secure
    • symantec
    • mcafee
    • pc-cillin
    • trend micro
    • kaspersky
    • sophos
    • norton

Email routine details

The worm has three possible email routines.

Routine 1
The worm sends a clean email message with the following characteristics:

From: <skrattahaha@hotmail.com>
To:
<qruvabzabr@hotmail.com>
<red@fna.se>
<debatt@svt.se>
<susanne.sjostedt@tidningen.to>
<skolverket@skolverket.se>
<mary.martensson@aftonbladet.se>
<katarina.sternudd@aftonbladet.se>
<cecilia.gustavsson@aftonbladet.se>
<jessica.ritzen@aftonbladet.se>
<margareta.cronquist@tidningen.to>
<annika.sohlander@aftonbladet.se>
<kerstin.danielson@aftonbladet.se>
<insandare@tidningen.to>
<insandare@aftonbladet.se>
Subject: DISKRIMINERAD !!!!

Routine 2

From: This is randomly selected from the email addresses that the worm finds in the:
  • Windows Address Book
  • .eml, .htm, and .dbx files

Subject: This is in Swedish or English, depending on the operating system.
Swedish:
  • Olaglig_skärmsläckare?
  • Rashets eller inte?
  • Hakkors.
  • Suspekta semaforer.
  • Avskyvärd_reklam.
  • Överviktiga_förnedras.
  • Go ack ack ack....
  • Är_USA_ett_UFO?
  • Korkad president.
  • Katt, hund, kanin.
English:
  • Screensaver advice.
  • Spy pics.
  • GO USA !!!!
  • G.W Bush animation.
  • Is USA a UFO?
  • Is USA always number one?
  • LINUX.
  • Nazi propaganda?
  • Catlover.
  • Disgusting propaganda.
Message: The worm uses one of 10 Swedish or 10 English messages.
Attachment: [a-z][a-z].scr

Routine 3
This routine contains a message that will auto-run the attachment.

From: This is randomly selected from the email addresses that the worm finds in the:
  • Windows Address Book
  • .eml, .htm, and .dbx files
Subject: <blank>
Attachment: [a-z][a-z].scr

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • 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.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a 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.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. 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.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Brian Ewell

Discovered: March 17, 2003
Updated: February 13, 2007 11:44:32 AM
Also Known As: W32/Ganda@MM [McAfee], Ganda [F-Secure], Win32/Ganda.A@mm [RAV], W32/Ganda.A@mm [Norman], Win32.Ganda.A [CA], W32/Ganda-A [Sophos], PE_GANDA.A [Trend], I-Worm.Ganda [KAV]
Type: Worm
Systems Affected: Windows


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

  1. Update the virus definitions.
  2. Run a full system scan and delete all the files detected as W32.Ganda.A@mm. Restore the deleted .exe and .scr files from a clean backup or re-install them.
For specific details on each of these steps, read the following instructions.

1. 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 here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

2. Scanning for and deleting the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.Ganda.A@mm, write down the filenames, and then click Delete.

    NOTE: As mentioned in step 3 of the Technical Description, the worm infects the .exe and .scr files. These files cannot be repaired and must be deleted. Restore the files that you deleted from a clean backup or re-install the file's software.

Writeup By: Brian Ewell