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Threat Encyclopedia

TROJ_OBVOD.AY


ALIASES:

TrojanDownloader:Win32/Obvod.M (Microsoft), Backdoor.Win32.PcClient.foss (Kaspersky), RDN/Downloader.a!ok (McAfee)

PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:
INFORMATION EXPOSURE:

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.524.04

FIRST VSAPI PATTERN DATE:

06 Jan 2014

VSAPI OPR PATTERN File:

10.525.00

VSAPI OPR PATTERN Date:

07 Jan 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_OBVOD.AY

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Windows%\Tasks\At{1-240}.job

Step 5

Delete this registry value

[ Learn More ]

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\Internet Explorer\Main
    • DisableScriptDebuggerIE = "yes"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Error Dlg Displayed On Every Error = "no"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • NoProtectedModeBanner = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • WarnOnZoneCrossing = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • 2500 = "3"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D
    • LA = "609"

Step 6

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.

NOTES:

Note:

  • After restarting in Safe Mode, check the list of files detected as TROJ_OBVOD.AY. These are the files noted in Step 2.
  • Open the folder location of the first file.
  • Delete the file detected as TROJ_OBVOD.AY. Note that the folder may contain two files that has almost similar file names, one of which is detected as TROJ_OBVOD.AY. If a file with file name {file name}{space}.{exe or com} exists in the current folder, rename it to {file name}.{exe or com} by removing the extra space.
  • Repeat these steps for the other files detected as TROJ_OBVOD.AY.


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