Overview
This is a generic detection for malware that attempts to exploit a stack buffer overflow vulnerability that is patched by the vendor in MS08-021.
More details of this vulnerability and the vendor patch at:
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Minimum DAT
5271 (2008-04-10) Updated DAT5501 (2009-01-20) |
Minimum Engine
5.1.00 File LengthVaries |
Description Added
2008-04-10 Description Modified2008-04-22 |
Malware Proliferation
Characteristics
In the wild exploits have been discovered to download and install the BackDoor-DKI trojan from a malicious site hosted on the igloofamily.com domain.
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This is a generic detection for malware that attempts to exploit a stack buffer overflow vulnerability that is patched by the vendor in MS08-021. The vulnerability lies in the processing of maliciously crafted integer calculations in EMF or WMF files by the Microsoft Graphics Device Interface (GDI) component.
When successful, the exploit can cause arbitrary code execution to install additional malware; or abnormal termination of Windows applications.
More details of this vulnerability and the vendor patch at:
Symptoms
When successful, the exploit can cause arbitrary code execution to install additional malware; or abnormal termination of Windows applications.
Other possible symptoms:
- Installation of the backdoor trojan mentioned.
- Unexpected HTTP connection to a malicious site on the mentioned domain(s).
Method of Infection
Maliciously crafted EMF or WMF files can exploit a stack buffer overflow vulnerability that lies in unpatched versions of the Microsoft Graphics Device Interface (GDI) component.
Removal
All Users:
Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:
2.Update to current engine and DAT files for detection and removal.
3.Run a complete system scan.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
1. Please go to the Microsoft Recovery Console and restore a clean MBR.
On windows XP:
Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
On Windows Vista and 7:
Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
Variants