W32.IRCBot.I

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
  Editor
  
  *******************************************************************************
  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
  Editor
  www.TotalBusiness.com
  
  **********************************************
  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
  
  Regards,
  
  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:

• 84.65.134.242
• 142.217.132.156
• 128.198.128.39
• 24.63.87.72
• 68.229.166.28
• 68.105.60.188
• 213.105.33.222
• 24.3.170.80

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.

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.

Summary