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| Zeus Botnet Victims | 
McAfee reported that the 
financially-oriented malware was by far the largest botnet on the web, 
claiming some 57 percent of botnet infections the company logged thus 
far in 2013. According to McAfee, Zeus and its variants account for some
 57.9 percent of all botnet infections. No other botnet on the list 
logged more than a nine percent share.
Following its first major outbreaks in 2009, the Zeus malware has long been a thorn in the side of the cybersecurity community.
Renowned for its ability to operate 
without alerting users, Zeus infections reside locally on the victim's 
PC and inject code directly into browser before a page is displayed. 
This allows Zeus variants to add data input fields or redirect 
transmissions from an otherwise legitimate website.
According to McAfee researcher Neeraj 
Thakar, the polymorphic nature of Zeus, which allows the malware to 
constantly change its own code, makes detecting the malware's signature 
all but impossible in the wild.
"Bot masters have become so advanced and 
organised that they can churn out thousands of undetectable and unique 
malware binaries each day," 
"That coupled with the ability to rapidly
 change the control-server hosting infrastructure allows them to stay 
active longer without being taken down."
The spread of Zeus continues despite efforts by security vendors to remove the various botnets built on the platform. Microsoft recently sued two men in the UK over their involvement in Zeus botnets.
Still, McAfee estimates that as many as 
37 percent of the 8.5 million malware payloads it has analysed this year
 are linked to known botnets, largely variants on Zeus.

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