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.


03:54 PM
Connect Directly

New Microsoft Data Shows Zbot Decline

MSRT initially found 444,292 computers infected with the Zeus-based Trojan, according to new data released today from Microsoft

Microsoft cleaned up close to a half-million machines infected with the Zbot botnet the month detection for the malware was added to the software giant's Malicious Software Removal Tool (MSRT).

The Win32/Zbot is a family of password-stealing Trojans that typically targets online banking credentials, stealing everything from website certificates to browser cookies; it's based on the Zeus malware kit. Last October, Microsoft added Win32/Zbot detection for 500 variants of the malware to its MSRT, and some 444,292 computers were found that month to be infected with the Trojan, according to new data released today from Microsoft. Around 34 percent of the Win32/Zbot variants were using older versions, according to newly released data from Microsoft.

And while Win32/Zbot infections among enterprises using Microsoft's Forefront Endpoint Protection and Threat Management Gateway in September hit a high of 134 percent of the monthly average number of detections for 2010, once MSRT began scanning for Zbot, the number of infections found by Microsoft's enterprise tools declined by about 46 percent.

One unexplained trend: In both August and October 2010, Win32/Zbot Hotmail detections jumped. "It is unclear what prompted botnet operators to greatly increase email distribution of the Win32/Zbot malware," according to Microsoft's new white paper, "SIR: Special Edition -- Battling the Zbot Threat."

The Trojan was most prevalent in Spain, where one out of every 100 computers running Microsoft Security Essentials had at least one Win32/Zbot attack attempt.

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
Newest First  |  Oldest First  |  Threaded View
Inside the Ransomware Campaigns Targeting Exchange Servers
Kelly Sheridan, Staff Editor, Dark Reading,  4/2/2021
Beyond MITRE ATT&CK: The Case for a New Cyber Kill Chain
Rik Turner, Principal Analyst, Infrastructure Solutions, Omdia,  3/30/2021
Register for Dark Reading Newsletters
White Papers
Current Issue
2021 Top Enterprise IT Trends
We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
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
PUBLISHED: 2021-04-11
An issue was discovered in libezxml.a in ezXML 0.8.6. The function ezxml_internal_dtd(), while parsing a crafted XML file, performs incorrect memory handling, leading to a NULL pointer dereference while running strcmp() on a NULL pointer.
PUBLISHED: 2021-04-10
Valve Steam through 2021-04-10, when a Source engine game is installed, allows remote authenticated users to execute arbitrary code because of a buffer overflow that occurs for a Steam invite after one click.
PUBLISHED: 2021-04-10
A command execution vulnerability in SonicWall GMS 9.3 allows a remote unauthenticated attacker to locally escalate privilege to root.
PUBLISHED: 2021-04-09
Zoom Chat through 2021-04-09 on Windows and macOS allows certain remote authenticated attackers to execute arbitrary code without user interaction. An attacker must be within the same organization, or an external party who has been accepted as a contact. NOTE: this is specific to the Zoom Chat softw...
PUBLISHED: 2021-04-09
Use after free in screen sharing in Google Chrome prior to 89.0.4389.114 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.