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Threat Encyclopedia

EXPL_NEVAR.B

Malware type: Exploit

Aliases: Exploit.Win32.IMG-WMF.ck (Kaspersky), Exploit-CVE2008-1087 (McAfee), Trojan.Emifie (Symantec), EXP/IMG-WMF.CK (Avira), TrojanDownloader:Win32/Poisonvy!JPG (Microsoft)

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:

High

Distribution potential:

Low

Description: 

Trend Micro threat researchers post findings and analyses on various threats in real-time at the Malware Blog. Users can find more information about this specific threat here.

To get a one-glance comprehensive view of the behavior of this malware, refer to the Behavior Diagram shown below.

EXPL_NEVAR.B Behavior Diagram

Malware Overview

This exploit may be dropped by other malware. It may arrive bundled with malware packages as a malware component.

It takes advantage of the GDI vulnerability in Microsoft. More information on the said vulnerability can be viewed in the following page:

Once exploited, the said vulnerability allows a remote user or a malware program to download files on the affected machine. As a result, the affected system becomes compromised.

It also attempts to connect to a certain URL to download a file detected by Trend Micro as BKDR_POISONIV.QI. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

For additional information about this threat, see:

Description created: Apr. 11, 2008 1:46:07 AM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  No

Size of malware: 676 Bytes

Initial samples received on: Apr 11, 2008

Vulnerability used:  (MS08-021) Vulnerabilities in GDI Could Allow Remote Code Execution (948590)

Related toBKDR_POISONIV.QI

Payload 1: Downloads files

Details:

This exploit may be dropped by other malware.

It may arrive bundled with malware packages as a malware component.

This exploit takes advantage of the GDI vulnerability in Microsoft. More information on the said vulnerability can be viewed in the following page:

Once exploited, the said vulnerability allows a remote user or a malware program to download files on the affected machine. As a result, the affected system becomes compromised.

It also attempts to connect to the URL http://{BLOCKED}amily.com/word.gif to download a file detected by Trend Micro as BKDR_POISONIV.QI. As a result, malicious routines of the downloaded file may be exhibited on the affected system.

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


Analysis By: Michael Cabel

Revision History:

First pattern file version: 5.212.05
First pattern file release date: Apr 11, 2008

SOLUTION


Minimum scan engine version needed: 8.300

Pattern file needed: 5.213.00

Pattern release date: Apr 13, 2008


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:

Note: To fully remove all associated malware, perform the clean solution for BKDR_POISONIV.QI.

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 EXPL_NEVAR.B . 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.

Applying Patch

This malware exploits known vulnerability in Windows. Download and install the fix patch supplied by Microsoft. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.




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