Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Endpoint

7/5/2011
01:54 PM
Connect Directly
Twitter
RSS
E-Mail
50%
50%

Botnet Postmortem: Rustock Now Less Than Half The Size It Was At Takedown

New Microsoft report says Rustock victims likely infected with other malware, and still 'a long way to go' in cleaning up machines infected by the massive, now-defunct spamming botnet

It has been four months since Microsoft and federal authorities knocked the prolific spamming botnet Rustock offline, and some 700,000 of the estimated 1.6 million bots worldwide are still infected with its malware. A new Microsoft report published today based on intelligence it gathered from cleanup and removal of Rustock from infected bots also shows that Rustock-infected machines are typically riddled with other malware, as well.

Rustock, which was able to send some 30 billion spam email messages each day, including phony prescription drugs and fake Microsoft lottery scams, was crippled after seven Internet hosting locations in the U.S. were raided in the takedown operation in March. FireEye, researchers at the University of Washington, Pfizer, the Dutch High Tech Crime Unit, and the Chinese CERT all assisted in the operation.

Microsoft's Digital Crimes Unit and MMPC ran an experiment with the Win32/Rustock malware family of rootkit-enabled backdoor Trojans and found that within five minutes, multiple malware and unwanted software was downloaded onto a Rustock-infected machine. That confirmed Microsoft's suspicion that Rustock bots were likely infected with more than just Rustock's malware, Richard Boscovich, senior attorney for Microsoft Digital Crimes Unit, said in a blog post today.

The experiment used Win32/Harnig, a Rustock dropper, used for getting bots. "Within five minutes of installation, a wide variety of additional malware and potentially unwanted software had been downloaded and installed onto the infected computer -- and many of these threats are themselves designed to eventually download even more malware," Boscovich said.

Among the 19 other malware programs that had infested the machine was rogue adware, spyware, various Trojan downloaders, and a worm.

Meanwhile, Microsoft says the number of Rustock bots has been cut by 56.12 percent, with the most bots in India, with 99,032; followed by the U.S., with 55,731; Turkey, with 50,465; Italy, with 32,041; Russia, with 27,535; Germany, with 25,318; Brazil, with 21,967; France, with 21,625; Mexico, with 19,064; and Poland, with 18,015.

Russia had the highest rate of reduction in victims since Rustock was first taken down, with 70.61 percent of its machines getting cleaned up, followed by India, with 69.3 percent, and Brazil, with a reduction of 53.24 percent.

"In short, since the time of the initial takedown we estimate the Rustock botnet is now less than half the size it was when we took it down in March. That’s great news, and the infection reduction has happened much more quickly than it did for Waledac over a similar period of time last year, but we still have a long way to go," Microsoft's Boscovich said in his post.

Meanwhile, Microsoft Digital Crimes Unit researchers saw one Rustock bot send 7,500 spam emails in 45 minutes -- a rate of 240,000 spam emails a day.

A copy of the full report, "Special Edition Security Intelligence Report: Battling the Rustock Threat," is available for download here.

Have a comment on this story? Please click "Add Your Comment" below. If you'd like to contact Dark Reading's editors directly, send us a message.

Kelly Jackson Higgins is the Executive Editor of Dark Reading. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Commentary
Ransomware Is Not the Problem
Adam Shostack, Consultant, Entrepreneur, Technologist, Game Designer,  6/9/2021
Edge-DRsplash-11-edge-ask-the-experts
How Can I Test the Security of My Home-Office Employees' Routers?
John Bock, Senior Research Scientist,  6/7/2021
News
New Ransomware Group Claiming Connection to REvil Gang Surfaces
Jai Vijayan, Contributing Writer,  6/10/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
The State of Cybersecurity Incident Response
In this report learn how enterprises are building their incident response teams and processes, how they research potential compromises, how they respond to new breaches, and what tools and processes they use to remediate problems and improve their cyber defenses for the future.
Flash Poll
How Enterprises are Developing Secure Applications
How Enterprises are Developing Secure Applications
Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-20469
PUBLISHED: 2021-06-21
White Shark System (WSS) 1.3.2 has a SQL injection vulnerability. The vulnerability stems from the log_edit.php files failing to filter the csa_to_user parameter, remote attackers can exploit the vulnerability to obtain database sensitive information.
CVE-2020-20470
PUBLISHED: 2021-06-21
White Shark System (WSS) 1.3.2 has web site physical path leakage vulnerability.
CVE-2020-20471
PUBLISHED: 2021-06-21
White Shark System (WSS) 1.3.2 has an unauthorized access vulnerability in default_user_edit.php, remote attackers can exploit this vulnerability to escalate to admin privileges.
CVE-2020-20472
PUBLISHED: 2021-06-21
White Shark System (WSS) 1.3.2 has a sensitive information disclosure vulnerability. The if_get_addbook.php file does not have an authentication operation. Remote attackers can obtain username information for all users of the current site.
CVE-2020-20473
PUBLISHED: 2021-06-21
White Shark System (WSS) 1.3.2 has a SQL injection vulnerability. The vulnerability stems from the control_task.php, control_project.php, default_user.php files failing to filter the sort parameter. Remote attackers can exploit the vulnerability to obtain database sensitive information.