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Discovered: January 31, 2006
Updated: October 21, 2008 11:16:55 PM
Type: Worm
Systems Affected: Windows

W32.IRCBot.I is a back door Trojan horse that connects to an IRC server and awaits commands from a remote attacker, including spreading through network shares, spam email messages, IRC channels and to other computers.

Antivirus Protection Dates

  • Initial Rapid Release version January 31, 2006
  • Latest Rapid Release version May 31, 2016 revision 036
  • Initial Daily Certified version January 31, 2006
  • Latest Daily Certified version June 01, 2016 revision 005
  • Initial Weekly Certified release date February 01, 2006

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

Writeup By: Kazumasa Itabashi

Discovered: January 31, 2006
Updated: October 21, 2008 11:16:55 PM
Type: Worm
Systems Affected: Windows

The Trojan may arrive as an attachment to an email with the following characteristics:

Subject :
One of the following:

  • Campus Life
  • SPAM-FGT: Photo Approval Needed
  • Payment Receipt
  • Campus Student Raped
  • CCTV still of Rapist
  • Rape on Campus

Message body :
One of the following:
  • Hello,

    We are planning to include you in the new campus magazine in an article titled "Campus Life". Can you approve the photo and article for us before we go to printing please?

    If any details are wrong then we can amend before printing on Wednesday the 1st of February so please get back to us as soon as possible. We have attached the photo and article.

    Many Thanks & Best Regards,

    Joseph Hope

    Please respond before February 1st to ensure we have time to edit!

  • Hello,
    We have been trying to get through to you on the phone today but you must be out at work, your photograph was forwarded to us as part of an article we are publishing for our February edition of Total Business Monthly. Can you check over the format and get back to us with your approval or any changes? If the picture isnot to your liking then please send a preferred one. We've attached the photo with the article here.

    Kind regards,

    Jamie Andrews

    The Professional Development Institute

  • Dear customer.

    Thank you for your subscription to [http://]www.viewpornstars.com
    You have been billed as Paycom LLC for the amount of: USA 49.99 for 30 days then USA 39.99 recurring every 30 days.

    Time: 2006-1-05 20:38
    Transaction ID: 965658
    Amount: GBP 49.99
    Applied to Account3: 10915104
    Payment Method: VISA

    Your new subscription identification number is:10915104, please keep this number in a safe place as it will be required for reference in all future correspondence regarding your membership.

    Your membership access information is:
    Username for your subscription: 112002
    Password for your subscription is: regina
    Membership website [http://]www.viewpornstars.com

    For further details regarding this transaction and direct access to our online billing support services, available 24-hours a day, 365-days a year, please check your transaction details in attachment. From there you can update informationand post queries direct to our support team.

    Thank you for choosing Paycom as the eMerchant for your subscription!
    Customer Support
    Billing services provided by Paycom, LLC

  • Hello,

    During the early morning of January 25 2006, a campus student was the victim ofa horrific sexual assault within college grounds. Eyewitnesses report a tall black man in grey pants running away from the scene. Campus CCTV has caught this man on camera and are looking for ways to identify him. If anyone recognises the attached picture could they inform administraion immediatly


    Robert Atkins
    Campus Administration

    All information contained within this e-mail, including any attachment, isconfidential. If you have received this e-mail in error, please delete itimmediately. Do not use, disclose or spread the information in any way and notify the sender immediately. Any views and opinions expressed in this e-mail may not represent those of Business Monthly

Attachment :
One of the following:
  • article.zip
  • Article+Photos.zip
  • Transaction and Billing Services.zip
  • Transaction and Billing Services.exe
  • suspect photo.exe
  • suspect image.exe
  • CCTVstill.exe

When the Trojan is executed, it copies itself as one of the following files:
  • %System%\csrwnd.exe
  • %System%\csrwjd.exe
  • %System%\csrnvrt.exe

The Trojan then creates the following registry entries, so that it is executed every time Windows starts:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"SystemProcEvent" = "[TROJAN FILE NAME]"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"SystemProcEvent" = "[TROJAN FILE NAME]"

The variable [TROJAN FILE NAME] corresponds to the file name of one of the copies of the Trojan created above.

The Trojan then runs netsh.exe with the following string, which bypasses the Windows Firewall settings on the compromised computer:
netsh.exe firewall set allowedprogram %System%\[TROJAN FILE NAME]

The Trojan runs netsh.exe to create the following registry entry:
HKEY_LOCAL_MACHINE\system\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\"%System%\[TROJAN FILE NAME]" = "%System%\[TROJAN FILE NAME]:*:Enabled:Unspecified"

The Trojan will then attempt to end some of the following processes:
  • Ad-watch.exe
  • MRT.exe
  • NAVW32.exe
  • SymWSC.exe
  • TeaTimer.exe
  • ccApp.exe
  • ccEvtMgr.exe
  • gcasDTServ.exe
  • gcasServ.exe
  • kpf4gui.exe
  • kpf4ss.exe
  • mcshield.exe
  • mcupdate.exe
  • mcvsrte.exe
  • nmain.exe
  • savscan.exe

The Trojan will then attempt to connect to the following IRC servers:

It will join a predefined channel using a random user name. The Trojan will then listen for commands, allowing an attacker to download and execute arbitrary files and may copy itself to shared folders on other computers.


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: Kazumasa Itabashi

Discovered: January 31, 2006
Updated: October 21, 2008 11:16:55 PM
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. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Run a full system scan.
  4. Delete any values added to the registry.

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

1. To disable 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:

Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, 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. To update 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.

    If you use Norton AntiVirus 2006, Symantec AntiVirus Corporate Edition 10.0, or newer products, LiveUpdate definitions are updated daily. These products include newer technology.

    If you use Norton AntiVirus 2005, Symantec AntiVirus Corporate Edition 9.0, or earlier products, LiveUpdate definitions are updated weekly. The exception is major outbreaks, when definitions are updated more often.

  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them.

The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions . For detailed instructions read the document: How to update virus definition files using the Intelligent Updater .

3. To run a full system scan
  1. 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.

  2. Run a full system scan.
  3. If any files are detected, follow the instructions displayed by your antivirus program.
Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

4. To delete the value from the registry
Important: 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 subkeys only. For instructions refer to the document: How to make a backup of the Windows registry .
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to and delete the following registry entries:

    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"SystemProcEvent" = "[TROJAN FILE NAME]"
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"SystemProcEvent" = "[TROJAN FILE NAME]"

  5. Restore the following registry entry to their previous values, if required:

    HKEY_LOCAL_MACHINE\system\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\"%System%\[TROJAN FILE NAME]" = "%System%\[TROJAN FILE NAME]:*:Enabled:Unspecified"

  6. Exit the Registry Editor.

    Note: If the risk creates or modifies registry subkeys or entries under HKEY_CURRENT_USER, it is possible that it created them for every user on the compromised computer. To ensure that all registry subkeys or entries are removed or restored, log on using each user account and check for any HKEY_CURRENT_USER items listed above.

Writeup By: Kazumasa Itabashi