Home / malware Email-Worm:VBS/Gedza.B
First posted on 10 September 2008.
Source: SecurityHomeAliases :
There are no other names known for Email-Worm:VBS/Gedza.B.
Explanation :
This type of worm is embedded in an e-mail attachment, and spreads using the infected computer's e-mailing networks.
right]Email-Worm:VBS/Gedza.B is a very nasty worm which performs a variety of date-triggered actions every month. It is particularly troublesome because, in addition to spreading by email attachments like most email worms, it is also coded to be able to use numerous other vectors, including removable media and Peer-to-Peer (P2P) networks.
Whether the user is infected automatically or needs the user to perform some action depends on which vector is used. For example, if the worm comes in contact with the user's system over a network, it does not require any action from the user to infect the system; but if it is spread through email or a Word document, the user must open the email or document in order to be infected.
The worm appears to launch an innocuous image of Avril Lavigne. On certain dates every month however, the worm will perform a certain action, with different actions on different dates.
On the 3rd of every month:
On the 11th of every month:
On the 19th of every month:
On the 26th of every month:
On the 29th of every month:
The worm causes the user's browser to open at the website "http://www.avril-lavigne.com".
In addition to the various annoying date-triggered actions, the worm causes trouble by spreading through a exceptionally large number of ways.
1) It can spread through disks and removable drives by :
* Overwriting files with itself
- Writing VBScript codes if the file extension ends with .vbs or .vbe
- Writing JavaScript codes if the file extension ends with .js or .jse
* Appending itself to files
- Appending itself to the end of files with extensions "hta","htm","html","php","shtm","shtml" and other website related extensions.
* Changing zip content
- inserting a copy of itself into zip archives
2) It can spread through e-mail by:
- creating a template in Outlook
- sending itself out using its own mail application
3) It can spread through Peer-to-Peer (P2P) networks by:
- copying infected zip files to P2P shared folders with interesting names eg. "HotGirls.zip" , "AVP Antivirus Pro Key Crack.zip" , "warcraft 3 crack.zip" and etc.
4) It can spread through networks by:
- Going through random IPs and using a set of common usernames and passwords to try and gain access to network folders
- Once the worm has access to network folders, it infects them
5) It can spread through IIS servers by:
- Hosting an ISS server and creating asp for it
6) It can spread through Excel and Word by:
- Creating macros as normal templates for Word and Excel
- Disabling alerts and lower macro security
7) It can spread through mIRC by:
- EditingmIRC.ini and creating an IRC script to propagate itself.Last update 10 September 2008
