Threat Encyclopedia

VBS_AGENT.KTR

Malware type: VBScript

Aliases: Trojan-Downloader.VBS.Agent.n (Kaspersky), Exploit-MS06-014 (McAfee), Downloader (Symantec), VBS/Dldr.Agent.RE.1 (Avira), VBS/DownLdr-A (Sophos),

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:

Medium

Distribution potential:

Low

Description: 

This malicious Visual Basic Script (VBS) usually arrives on a system as a file downloaded from the Internet by unsuspecting users when visiting malicious Web sites. It may also arrive as a file dropped or downloaded by other malware.

Upon execution, it connects to the following URL to download a malicious file detected by Trend Micro as TROJ_AGENT.OFB:

    http://216.95.{BLOCKED}.22/tool/package.exe?affid=477

The said file is saved in the Temporary folder with the file name SVCIPA.EXE. This VB Script also executes the downloaded file.

As a result of this, the behavior of the downloaded Trojan may be observed on the affected system.

For additional information about this threat, see:

Description created: Mar. 5, 2007 12:31:18 AM GMT -0800


TECHNICAL DETAILS


File type: Script

Size of malware: 1,899 Bytes

Initial samples received on: Mar 2, 2007

Payload 1: Downloads files

Details:

This malicious Visual Basic Script (VBS) usually arrives on a system as a file downloaded from the Internet by unsuspecting users when visiting malicious Web sites. It may also arrive as a file dropped or downloaded by other malware.

Upon execution, it connects to the following URL to download a malicious file detected by Trend Micro as TROJ_AGENT.OFB:

    http://216.95.{BLOCKED}.22/tool/package.exe?affid=477

The said file is saved in the Temporary folder with the file name SVCIPA.EXE. This VB Script also executes the downloaded file.

As a result of this, the behavior of the downloaded Trojan may be observed on the affected system.

This malicious script runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Hazel Mariscal

Revision History:

First pattern file version: 4.310.02
First pattern file release date: Mar 02, 2007

SOLUTION


Minimum scan engine version needed: 8.000

Pattern file needed: 4.311.00

Pattern release date: Mar 4, 2007


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.

Solution:

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 VBS_AGENT.KTR and TROJ_AGENT.OFB. 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.




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