Feeds

Spam levels plummet as Rustock botnet taken down... for now

815,000 zombies with no master...

New hybrid storage solutions

Spam volumes shrank on Wednesday after the prolific Rustock botnet fell silent, reportedly as a result of a takedown action.

Rustock, which is made up of a network of compromised (malware-infected) Windows PCs, turns an illicit income for its unknown controllers by being the biggest single source of global spam. The botnet is particularly active in advertising unlicensed net pharmacies, or at least it was until Wednesday afternoon, when its junk mail deluge ran dry.

Security blogger Bryan Krebs, who broke the story of the sudden drop-off, suggests the respite of spam from Rustock is the possible result of a takedown action against the zombie network's command and control system. "Dozens of internet servers used to coordinate these spam campaigns ceased operating, apparently almost simultaneously," he writes. "Such an action suggests that anti-spam activists have succeeded in executing possibly the largest botnet takedown in the history of the internet."

Details of who took this action are unclear at present, though security firms were able to confirm that Krebs is spot on in attributing a sharp drop in spam levels to the shut-down (at least temporarily) of Rustock.

M86 Security Labs, for example, said that Rustock control servers it monitors are unreachable. "It is unclear yet who or what caused the shutdown," the security firm said in a blog post on the Rustock shutdown that includes a graph of the botnet's junk mail output. "It's also possible it has been abandoned."

The Rustock botnet is made up of an estimated 815,000 compromised Windows PCs, controlled via a network of around 26 servers.

Infected machines are still pox-ridden but without instructions to act on and spam templates to drawn upon they have been rendered inert, at least for now. Rustock has been around for around three years and, at its peak, was to blame for half the spam in circulation.

Spam from Rustock previously fell away to almost nothing over the Christmas and New Year holiday before returning in mid-January, possibly as the result of a temporary break by the botherders controlling the network, so it would be unwise to write up Rustock's obituary just yet. Even if Rustock is properly dead, the business of using junk mail messages to spamvertise sites offered unlicensed pharmaceuticals is simply too lucrative to disappear anytime soon. Economic logic dictates that someone will move in and pick up the slack. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
Leak of '5 MEELLLION Gmail passwords' creates security flap
You should be OK if you're not using ANCIENT password
Google recommends pronounceable passwords
Super Chrome goes into battle with Mr Mxyzptlk
Reddit wipes clean leaked celeb nudie pics, tells users to zip it
Now we've had all THAT TRAFFIC, we 'deplore' this theft
Enigmail PGP plugin forgets to encrypt mail sent as blind copies
User now 'waiting for the bad guys come and get me with their water-boards'
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
prev story

Whitepapers

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.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
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.
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.