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This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.
This Trojan drops the following file(s)/component(s):
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It drops the following copies of itself into the affected system:
It injects codes into the following process(es):
The scheduled task executes the malware every:
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MainDisableScriptDebuggerIE = "yes"
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MainError Dlg Displayed On Every Error = "no"
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MainNoProtectedModeBanner = "1"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet SettingsWarnOnZoneCrossing = "0"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\32500 = "3"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3DLA = "609"
This Trojan checks all data in the registry entries of the following registry keys:
From the gathered data, it identifies all files with extensions .exe and .com. It renames all files it finds using the following format:
It then creates copies of itself using the original file names and in the original folders of the renamed files.
This Trojan connects to the following sites to obtain a list of URLs for pay-per-click scheme:
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Scan your computer with your Trend Micro product and note files detected as TROJ_OBVOD.AY
Restart in Safe Mode
To restart in Safe Mode:
• For Windows 2000 users
• For Windows XP users
• For Windows Server 2003 users
• For Windows Vista and Windows 7 users
Search and delete this file
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
• For Windows Vista and Windows 7 users:
Delete this registry value
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.
To delete the registry value this malware created:
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_OBVOD.AY. 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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