GEN:SID | 1:775 |
Message | Virus - Possible Bubbleboy Worm |
Summary | QAZ is a Trojan Horse.
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Impact | Possible theft of data and control of the targeted machine leading to a compromise of all resources the machine is connected to.
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Detailed Information | This Trojan affects the following operating systems:
Windows 95 Windows 98 Windows ME Windows NT Windows 2000 Windows XP
No other systems are affected. This is a windows exceutable that makes changes to the system registry.
The Trojan changes system startup files and registry settings to add the QAZ sever to programs normally started on boot.
SID Message --- ------- 108 QAZ Worm Client Login access 731 Virus - Possible QAZ Worm (Indicates worm activity) 775 Virus - Possible QAZ Worm Infection (Indicates worm activity) 733 Virus - Possible QAZ Worm Calling Home (Indicates the worm is trying to send mail)
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Affected Systems | |
Attack Scenarios | This Trojan may be delivered to the target in a number of ways. This event is indicative of an existing infection being activated. Initial compromise can be in the form of a Win32 installation program that may use the extension ".jpg" or ".bmp" when delivered via e-mail for example.
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Ease of Attack | This is Trojan activity, the target machine may already be compromised. Updated virus definition files are essential in detecting this Trojan.
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Corrective Action | This is a particularly difficult Trojan to remove and should only be attempted by an experienced Windows Administrator.
Edit the system registry to remove the extra keys or restore a previously known good copy of the registry.
Affected registry keys are:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current Version\Run
Registry keys added are:
StartIE=C:\WINDOWS\notepad.exe qazwsx.hsq
This will start the Trojan each time notepad is executed.
Look for the existence of the file note.com. The file notepad.exe may have been replaced with a Trojaned version that is approximately 120 kb in size (the original is 52 kb).
A machine reboot is required to clear the existing process from running in memory.
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Additional References | Whitehats arachNIDS http://www.whitehats.com/info/IDS501 http://www.whitehats.com/info/IDS498 http://www.whitehats.com/info/IDS499
McAfee http://vil.nai.com/vil/content/v_98775.htm
Symantec Security Response http://securityresponse.symantec.com/avcenter/venc/data/w32.hllw.qaz.a.html
Diamond Computer Systems Security Advisory http://www.diamondcs.com.au/web/alerts/qaz.htm
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Rule References | MCAFEE: 10418
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