VBS.Vbswg.K is created using a worm generator tool, and is detected as VBS.Vbswg.gen. This particular variant spreads by using Microsoft Outlook, mIRC and pirch, and it uses the file name "Neue Tarife.txt.vbs". The mIRC .ini script file is detected as VBS.Vbswg.K (mIRC) and the Pirch .ini script file is detected as VBS.Vbswg.K (pirch).
When spreading by email, this worm presents itself as a message from the German ISP t-online. The attachment is a price list.
Shared drives: All drives available to the contaminated system
Target of infection: All email addresses in the Outlook address book, mIRC users and pirch users
When this worm spreads using Microsoft Outlook, all entries in the address book are targeted. The messages have the following attributes:
Subject:
Neues von Ihrem Internetdienstleister - Robert T. Online informiert
Message:
Sehr geehrter Internetsurfer,
es hat sich einiges bei uns getan. Die Telekom kann auch Ihre Internetkosten reduzieren. Wir haben auch für Sie den richtigen Tarif... Damit auch Sie sich entscheiden können, haben wir eine übersicht aller für Sie relevanter Termine an diese eMail gehängt. Wir sind Sicher, auch Sie werden Ihren Wunschtarif finden.
Bei fragen stehen wir Ihnen natürlich jederzeit zur Verfügung...
Ihr T-Online Service Team
Attachment:
Neue Tarife.txt.vbs
After emailing itself, the virus sets a registry key so that it will not email itself again.
To spread by mIRC, this worm modifies the mIRC file script.ini that is automatically used by mIRC. The viral script.ini file is detected as VBS.Vbswg.K (mIRC).
To spread by pirch, this worm modifies the pirch file events.ini that is automatically used by pirch. The viral events.ini file is detected as VBS.Vbswg.K (pirch).
This worm searches all available drives for mIRC or pirch installations.
Once run, a copy of the worm is stored as \<Windows folder>\Neue Tarife.txt.vbs. The worm then remains running, and if it is deleted, it attempts to recreate itself. Due to a bug in the code, the worm instead recreates itself as a zero-byte file.
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.
Run LiveUpdate to make sure that you have the most recent virus definitions.
Start Norton AntiVirus (NAV), and then run a full system scan, making sure that NAV is set to scan all files.
