TrendLabs Malware Blog
Glossary
TrendWatch
TrendLabs Twitter
WORM_KLEZ.A
Overview

Malware type: Worm

Aliases: W32.Klez, KLEZA.A

In the wild: Yes

Destructive: Yes

Language: English

Platform: Windows

Encrypted: Yes

Overall risk rating:


Description: 
This destructive, persistent, memory resident, multi-process, and multi-threaded worm spreads a copy of itself via email and Network shared drives. This worm consists of two components. The main worm and a Windows executable infector. Trend Micro antivirus detects the Windows file infector component of this worm as PE_ELKERN.A.

Similar to PE_NIMDA.A, this worm also utilizes the exploits for Microsoft Outlook and Outlook Express, which allow the automatic execution of an attachment during preview.

On Windows NT/2K systems, this worm registers itself as a system service. On Windows 9X, it is hidden from the Task List.

More information on this vulnerability is available at: Microsoft TechNet.

Read more about these variants.

For additional information about this threat, see:
Solution
Technical Details

Description created: Oct. 26, 2001 10:42:07 AM GMT -0800
Description updated: Oct. 26, 2001 10:45:00 AM GMT -0800

Search a new malware

Tell us how we did. Take our quick survey.