Feeds

JavaScript worm targets Yahoo!

Malware latches onto unpatched flaw

Providing a secure and efficient Helpdesk

A JavaScript worm that takes advantage of an unpatched vulnerability in Yahoo!'s webmail service has been discovered on the net.

The JS-Yamanner worm spreads when a Windows user accesses Yahoo! Mail to open an email sent by the worm. The attack works because of a vulnerability in Yahoo! Mail that enables scripts embedded within HTML emails to be run within a user’s browser instead of being blocked.

Once executed, the worm forwards itself to an infected users' contacts on Yahoo! Mail. It also harvests these address and sends them to a remote internet server. Only contacts with an email address of either @yahoo.com or @yahoogroups.com are hit by this behaviour.

Infected emails commonly have the subject line "New Graphic Site" and are spoofed so as to appear from "av3@yahoo.com". Users who open infected emails will be redirected to a webpage at www.av3.net/index.htm.

Symantec Security Response senior manager Kevin Hogan said: "Unlike its predecessors, which would require the user to open an attachment in order to launch and propagate, JS-Yamanner makes use of a security hole in the Yahoo! web mail program in order to spread to other Yahoo! users. Yahoo! is a popular email tool, and although normally closed to such threats, the exploitation of this vulnerability provides access to a significant number of internet users.

"As there is no patch at present, users are recommended to update virus definitions and firewall signatures and to block any emails sent from av3@yahoo.com." ®

New hybrid storage solutions

More from The Register

next story
Google recommends pronounceable passwords
Super Chrome goes into battle with Mr Mxyzptlk
Infosec geniuses hack a Canon PRINTER and install DOOM
Internet of Stuff securo-cockups strike yet again
Reddit wipes clean leaked celeb nudie pics, tells users to zip it
Now we've had all THAT TRAFFIC, we 'deplore' this theft
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
TorrentLocker unpicked: Crypto coding shocker defeats extortionists
Lousy XOR opens door into which victims can shove a foot
Hackers pop Brazil newspaper to root home routers
Step One: try default passwords. Step Two: Repeat Step One until success
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.