BAT.Eversaw.B@mm

SUMMARY

BAT.Eversaw.B@mm is a script worm that attempts to distribute itself using Microsoft Outlook, KaZaA, mIRC, and pIRCh.

This threat may appear in email in the following format:

Subject: Who controls you?
Message: Stop your soul being controled! Get illuminated.
Attachment: Bat.soulcontrol.bat

BAT.Eversaw.B@mm adds the root of the hard drive to KaZaA shared folders and copies itself to that location as Bat.soulcontrol.bat .

The worm also attempts to modify the mIRC and pIRCh configuration files to send itself when an infected computer connects to mIRC or pIRCh channels.

Protection

• Virus Definitions (LiveUpdate™ Weekly) July 18, 2002
• Virus Definitions (Intelligent Updater) July 18, 2002

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Medium
• Large Scale E-mailing: sends itself to all addresses in the Microsoft Outlook Address Book
• Deletes Files: contains a routine that could delete files.
• Modifies Files: inserts text into c:win.ini

Distribution

• Distribution Level: High
• Subject of Email: Who controls you?
• Name of Attachment: bat.soulcontrol.bat
• Size of Attachment: 138,203

TECHNICAL DETAILS

When BAT.Eversaw.B@mm runs, it does the following,

It copies itself as C:at.soulcontrol.bat. It also copies itself to drive A.

It then creates the following files:

• C:Run.bat (3,443 bytes)
• C:Cr.vbs (454 bytes)
• C:Soulcontrol.jpg (32,966 bytes)
• C:Pl.bat (54 bytes)

NOTES:

• C:Run.bat is an encrypted batch file when it is created. It does not contain a decryption routine and cannot be executed unless it is decrypted.
• C:Cr.vbs contains the decryption routine. It is not viral in itself.
• C:Soulcontrol.jpg is a clean .jpg file.
• C:Pl.bat contains a routine to display the C:Soulcontrol.jpg file.
• Because they are not viral, Symantec antivirus products do not detect C:Cr.vbs, C:Soulcontrol.jpg, C:Pl.bat, or C:Run.bat (if it is still encrypted). If your computer is infected with BAT.Eversaw.B@mm, we recommend that you delete these four files manually.

The worm decrypts C:Run.bat by using C:Cr.vbs and then runs the decrypted C:Run.bat. C:Run.bat contains a routine that spreads the worm to all addresses in the Microsoft Outlook Address Book, mIRC, and pIRCh.

NOTE: Norton Antivirus detects the decrypted C:Run.bat as BAT.Eversaw.B@mm.

The worm uses Microsoft Outlook to email itself to all addresses in Outlook Address Book. The email message is in the following format:

Subject: Who controls you?
Message: Stop your soul being controled! Get illuminated.
Attachment: Bat.soulcontrol.bat

It also searches for installations of mIRC and pIRCh. The worm modifies the configuration files to send a copy of the worm as Bat.soulcontrol.bat.

Next, the worm adds the root of drive C to the KaZaA shared folders by adding the value

Dir0 012345:c:

to the registry key

HKEY_CURRENT_USERSoftwareKazaaLocalContent

In this way, other KaZaA users can download C:Bat.soulcontrol.bat from the infected computer.

The worm deletes the following files:

• C:ProgrammeNorton~1S32integ.Dll
• C:ProgrammeF-Prot95Fpwm32.Dll
• C:ProgrammeMcafeeScan.Dat
• C:Tbavw95Tbscan.Sig
• C:ProgrammeTbavTbav.Dat
• C:TbavTbav.Dat
• C:ProgrammeAvpersonalAntivir.Vdf
• C:MircScript.Ini
• C:Mirc32Script.Ini
• C:Progra~1MircScript.Ini
• C:Progra~1Mirc32Script.Ini
• C:Pirch98Events.Ini

The worm adds this section to C:Win.ini:

[windows]
load=c:at.soulcontrol.bat
run=
NullPort=None

It adds the value

msg c:pl.bat

to the registry key

HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun

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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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

NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

Update the virus definitions, run a full system scan, and delete all files that are detected as BAT.Eversaw.B@mm. For details on how to do this, read the following instructions.

To scan with Norton AntiVirus and delete the infected files:

1. Obtain the most recent virus definitions. There are two ways to do this:
   • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
   • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.
     
     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. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files.
   • NAV Consumer products: Read the document How to configure Norton AntiVirus to scan all files.
   • NAV Enterprise products: Read the document How to verify a Symantec Corporate antivirus product is set to scan All Files.
3. Run a full system scan.
4. Delete all files that NAV detects as BAT.Eversaw.B@mm. Replace deleted program or system files from a clean backup, or reinstall them.