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Malware type: Trojan

Aliases: No Alias Found

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:



A Trojan horse program is a malware that is not capable of automatically spreading to other systems. Trojans are usually downloaded from the Internet and installed by unsuspecting users.

Trojans typically carry payloads or other malicious actions that can range from the mildly annoying to the irreparably destructive. They may also modify system settings to automatically start. Restoring affected systems may require procedures other than scanning with an antivirus program.

For additional information about this threat, see:

Description created: Aug. 18, 2009 7:42:20 AM GMT -0800

Minimum scan engine version needed: 8.700

Pattern file needed: 6.579.00

Pattern release date: Oct 26, 2009

Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.


For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

 Step 1: Identify and terminate files detected as TROJ_BUZUS.AYX  [learn how]


  1. For Windows 98 and ME users, Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

 Step 2:  Delete these registry values [learn how]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\
    • Framework module library = "%System%\infocard.exe"
    • Microsoft Msn Messenger = "%System%\msmsgs.exe"
    • Framework Module library = "%System%\infocard.exe"
    • Microsoft Msn Messenger = "%System%\msmsgs.exe"

 Step 3:  Restore these modified registry values [learn how]

    • From: EnableDCOM = "N"
      To: EnableDCOM = "Y"
    • From: restrictanonymous = "1"
      To: restrictanonymous = "0"

 Step 4: Reset the Internet Explorer Home and Search pages  [learn how]

 Step 5: Scan your computer with your Trend Micro product to delete files detected as TROJ_BUZUS.AYX

*Note: If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

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