PWS:Win32/Dozmot.C is a password stealer trojan that captures logon credentials for the multi-player online games "World of Warcraft" and "Final Fantasy XI". This trojan may download and execute other malware.
There are no common symptoms associated with this threat. Alert notifications from installed antivirus software may be the only symptom(s).
PWS:Win32/Dozmot.C is a password stealer trojan that captures logon credentials for the multi-player online games "World of Warcraft" and "Final Fantasy XI". This trojan may download and execute other malware.
Installation
PWS:Win32/Dozmot.C is installed by
TrojanDropper:Win32/Dozmot.C and is present as a file having a random file name as in the following example:
<system folder>\e5jid7my.dll
The registry is modified as in the following example:
Adds value: "dll"
With data: "<system folder>\e5jid7my.dll
To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate
PWS:Win32/Dozmot.C is then launched by the dropper with the aid of the Windows application "rundll32.exe", after which the dropper deletes itself and terminates.
PWS:Win32/Dozmot.C injects its code into running processes and behaves different depending on the process to which it is attached as described below.
Payload
Launches Internet Explorer
If PWS:Win32/Dozmot.C is injected into the processes "explorer.exe", "wmiprvse.exe", "alg.exe", "wuauclt.exe", "wscntfy.exe" or "ctfmon.exe", the trojan will load Internet Explorer using a paramater as in this example:
%Program Files%\Internet Explorer\iexplore.exe About:_.=[Madam,I'm Adam]=._
The .DLL is unloaded and then scheduled to be deleted at the next Windows reboot.
Downloads and Executes Arbitrary Programs
If the PWS:Win32/Dozmot.C is injected into "iexplore.exe" and iexplore.exe was called with "About:_.=[Madam,I'm Adam]=._" as parameters, the trojan sends data to the domain 'b35.info'. The domain uses a server-side script to log the sent data. The data is sent in the following format:
<domain and subfolder>/lin.php?m=<MAC Address>&g=<installed game value>
Where <installed game value> is a concatenation of the following:
"wow+" - if the registry subkey 'HKLM\SOFTWARE\Blizzard Entertainment\World of Warcraft' is present
"ffxi" - if the registry subkey 'HKLM\SOFTWARE\PlayOnline[US|JP|EU]' is present
If the server replies "ok", the trojan retrieves a data file from the same domain as 'url.txt'. If this step fails, it will retry 5 times at 10 second intervals after which the process 'iexplore.exe' is terminated.
The data file 'url.txt' contains a list of NULL delimited URLs. PWS:Win32/Dozmot.C will download each and, if executable, it will spawn processes from the downloaded files.
Sends Other Data
If PWS:Win32/Dozmot.C is injected into the process "wow.exe" (World of Warcraft) or "pol.exe" (PlayOnline Viewer), the trojan patches computer memory in order to retrieve game data. The trojan then connects to the domain 'b35.info' and submits retrieved game data.
Analysis by Cristian Craioveanu
Take the following steps to help prevent infection on your system:
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Enable a firewall on your computer.
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Get the latest computer updates for all your installed software.
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Use up-to-date antivirus software.
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Use caution when opening attachments and accepting file transfers.
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Use caution when clicking on links to web pages.
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Avoid downloading pirated software.
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Protect yourself against social engineering attacks.
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Use strong passwords.
Enable a firewall on your computer
Use a third-party firewall product or turn on the Microsoft Windows Internet Connection Firewall.
To turn on the Windows Firewall in Windows Vista
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Click Start, and click Control Panel.
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Click Security.
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Click Turn Windows Firewall on or off.
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Select On.
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Click OK.
To turn on the Internet Connection Firewall in Windows XP
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Click Start, and click Control Panel.
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Click Network and Internet Connections. If you do not see Network and Internet Connections, click Switch to Category View.
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Click Change Windows Firewall Settings.
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Select On.
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Click OK.
Get the latest computer updates
Updates help protect your computer from viruses, worms, and other threats as they are discovered. It is important to install updates for all the software that is installed in your computer. These are usually available from vendor websites.
You can use the Automatic Updates feature in Windows to automatically download future Microsoft security updates while your computer is on and connected to the Internet.
To turn on Automatic Updates in Windows Vista
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Click Start, and click Control Panel.
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Click System and Maintainance.
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Click Windows Updates.
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Select a setting. Microsoft recommends selecting Install updates automatically and choose a time that is convenient for you. If you do not choose Automatic, but you choose to be notified when updates are ready, a notification balloon appears when new downloads are available to install. Click the notification balloon to review and install the updates.
To turn on Automatic Updates in Windows XP
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Click Start, and click Control Panel.
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Click System.
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Click Automatic Updates.
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Select a setting. Microsoft recommends selecting Automatic. If you do not choose Automatic, but you choose to be notified when updates are ready, a notification balloon appears when new downloads are available to install. Click the notification balloon to review and install the updates.
Use up-to-date antivirus software
Most antivirus software can detect and prevent infection by known malicious software. To help protect you from infection, you should always run antivirus software that is updated with the latest signature files. Antivirus software is available from several sources. For more information,
see http://www.microsoft.com/protect/computer/viruses/vista.mspx.
Use caution when opening attachments and accepting file transfers
Exercise caution with e-mail and attachments received from unknown sources, or received unexpectedly from known sources. Use extreme caution when accepting file transfers from known or unknown sources.
Use caution when clicking on links to Web pages
Exercise caution with links to web pages that you receive from unknown sources, especially if the links are to a Web page that you are not familiar with, unsure of the destination of, or suspicious of. Malicious software may be installed in your system simply by visiting a Web page with harmful content.
Avoid downloading pirated software
Threats may also be bundled with software and files that are available for download on various torrent sites. Downloading "cracked" or "pirated" software from these sites carries not only the risk of being infected with malware, but is also illegal. For more information, see '
The risks of obtaining and using pirated software'.
Protect yourself from social engineering attacks
While attackers may attempt to exploit vulnerabilities in hardware or software in order to compromise a system, they also attempt to exploit vulnerabilities in human behavior in order to do the same. When an attacker attempts to take advantage of human behavior in order to persuade the affected user to perform an action of the attacker's choice, it is known as 'social engineering'. Essentially, social engineering is an attack against the human interface of the targeted system. For more information, see '
What is social engineering?'.
Use strong passwords
Attackers may try to gain access to your Windows account by guessing your password. It is therefore important that you use a strong password – one that cannot be easily guessed by an attacker. A strong password is one that has at least 8 characters, and combines letters, numbers, and symbols. For more information, see
http://www.microsoft.com/protect/yourself/password/create.mspx.
