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VULNERABILITIES - August 14, 2006

by Marianna Schmudlach / August 14, 2006 12:55 AM PDT

- Oscarbot.KD: first worm to exploit the vulnerability MS06-040-
Virus Alerts, by Panda Software (http://www.pandasoftware.com)

Madrid, August 14, 2006 - PandaLabs reports the appearance of a new
variant of the Oscarbot worm, namely Oscarbot.KD, which is the first
malware to exploit the vulnerability MS06-040. The security patch for
this vulnerability was released last week by Microsoft.

The worm was detected yesterday. Its main characteristics are:

- File name: wgareg.exe or wgavm.exe.
- File size: 9,609 bytes (wgareg.exe) or 9,374 bytes (wgavm.exe).
- It is packed with Mew, and its code is encrypted using a 1-byte XOR
mask.

Oscarbot.KD spreads across network shared resources, instant messaging
programs and by exploiting vulnerabilities.

It creates a service called wgareg, in order to pass itself off as the
Windows Genuine Advantage Registration Service. Once the worm is run, it
waits for remote control commands, received via IRC.

PandaLabs has already detected incidents caused by this worm and warns
users of its danger, as many users may not have yet applied the security
patch for the vulnerability it exploits. Panda Software's TruPrevent(TM)
Technologies detected Oscarbot.KD from the first moment.

For further information about these and other computer threats, visit
Panda Software's Encyclopedia.

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TruPreventTM Technologies detect the first worm
by Marianna Schmudlach / August 14, 2006 2:16 AM PDT

TruPreventTM Technologies detect the first worm
to exploit the Microsoft MS06-040 vulnerability -

Madrid, August 14, 2006 - The behavioral analysis of TruPreventTM Technologies has detected and blocked Oscarbot.KD (CME-482), the first worm that exploits the Microsoft MS06-040 vulnerability to infect systems, allowing a remote attacker to take a series of malicious action on compromised computers. Given that these technologies detect the worm without the need to have identified it previously, clients that have them installed were protected from the moment it first appeared.

Through the global network of TruPreventTM sensors, spread across the millions of computers of users that have these technologies installed, PandaLabs has detected a number of incidents involving this new worm, albeit not on the scale of an epidemic.

According to PandaLabs, Oscarbot.KD searches for computers with the MS06-040 vulnerability. If it finds them, it causes a buffer overflow on the system and executes the code needed to download a copy of itself onto computer in a file called wgareg.exe. However, Oscarbot.KD can also spread using the AOL instant messenger service and across shared drives.

When the worm is installed on a computer, it opens port 18067 and connects to certain IRC servers. This could allow a remote attacker to communicate with Oscarbot.KD to download and run all types of software on the compromised computer or launch attacks on other computers, among many other actions.

Moreover, the worm creates a service in the system with the name wgareg or wgavm, which aims to simulate a genuine Windows software authentication service. The name of the service could be "Windows Genuine Advantage Registration Service" or "Windows Genuine Advantage Validation Monitor". The explanatory texts of the service are: "Ensures that your copy of Microsoft Windows is genuine and registered. Stopping or disabling this service will result in system instability" or "Ensures that your copy of Microsoft Windows is genuine. Stopping or disabling this service will result in system instability".

Finally, Oscarbot.KD edits a series of Windows registry keys to disable the firewall included in certain versions of the operating system.

"It was a question of days before malicious code exploiting the MS06-040 vulnerability appeared. However, users should keep their guard up, as new types of malware taking advantage of this situation are likely to appear. In addition to downloading and installing the patch to correct this problem, it is also important to have an up-to-date antivirus and, if possible, proactive technologies suh as TruPreventTM. These have proven highly effective, blocking Oscarbot.KD without having previously identified it and acting as an additional layer of defense to complement traditional antivirus applications", explains Luis Corrons, director of PandaLabs.

Panda Software clients that don't yet have TruPreventTM Technologies have the updates available to install them along with their antivirus and ensure they have prevented protection against unknown viruses and intruders. More information about TruPreventTM Technologies at http://www.pandasoftware.com/truprevent

Microsoft vulnerability MS06-040 affects Windows 2003, XP and 2000. The Microsoft patch to resolve the problem is available at: http://www.microsoft.com/technet/security/bulletin/ms06-040.mspx

To help as many users as possible scan and disinfect their systems, Panda Software offers its free, online anti-malware solution, Panda ActiveScan, which now also detects spyware, at http://www.activescan.com. Webmasters who would like to include ActiveScan on their websites can get the HTML code, free from http://www.pandasoftware.com/partners/webmasters/

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WSLabs, Malicious Code Alert: MS06-040 Exploited by IRC Bot/
by Marianna Schmudlach / August 14, 2006 2:44 AM PDT

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