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Malware Overview This worm arrives on a system either downloaded from the Internet or dropped by another malware. It may also arrive via MSN Messenger. When executed, it replaces the valid MSN Messenger executable file MSNMSGR.EXE with a copy of itself, while the original file is renamed as MSN.EXE. This routine ensures that this worm is executed every time an affected user attempts to launch MSN Messenger. This worm also executes the file, MSN.EXE, and launches the MSN Messenger application to avoid immediate detection. It propagates via the MSN Messenger application. It sends the following message to all online contacts found in the messenger application: is that you on that photo?! :| http://www.{BLOCKED}22.com/photos.php?photo=photo211.jpg Clicking on the indicated URL may download on the affected system either a copy of itself or other possibly malicious files. Users are thus advised not to click on any suspicious link even if the instant message appears to come from a trusted source. As of this writing, however, the said URL is unavailable.
Solution:
Terminating the Malware Program This procedure terminates the running malware process. - Open Windows Task Manager.
• On Windows 98 and ME, press
CTRL+ALT+DELETE
• On Windows NT, 2000, XP, and Server 2003, press
CTRL+SHIFT+ESC, then click the Processes tab. - In the list of running programs*, locate the process:
msnmsgr.exe - Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
- To check if the malware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
*NOTE: On computers running Windows 98 and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the malware process. On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode. Important Windows ME/XP Cleaning Instructions Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers. Users running other Windows versions can proceed with the succeeding solution set(s). Running Trend Micro Antivirus If you are currently running in safe mode, please restart your computer normally before performing the following solution. Scan your computer with Trend Micro antivirus and delete files detected as WORM_KELVIR.EH. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner. Restoring Renamed File - Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
MSN.EXE - In the Look In drop-down list, select the drive that contains Windows, then press Enter.
- Once located, right-click on the said file, select Rename from the context menu, and change the file name to MSNMSGR.EXE.
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