Zeus Bank Malware Surges On Facebook

Old threat makes a comeback, targeting Facebook users bank credentials and more.

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Zeus malware, long popular with the cybercrime underground, has seen a resurgence in the first half of 2013, becoming a weapon of choice for attacks distributed via spam emails as well as social networks such as Facebook.
That finding comes from security firm Trend Micro, which has reported seeing a spike in attempted
Zeus Trojan application
infections beginning in February 2013 and peaking in May. Zeus malware targets personal and financial data stored on Windows PCs and is controlled via a Zbot botnet.
Old threats like Zbot can always make a comeback because
cybercriminals profit from these
, said Jay Yaneza, senior technical manager at Trend Micro, in a blog post. Peddling stolen banking and other personal information from users is a lucrative business in the underground market. Plus, these crooks can use your login credentials to initiate transactions in your account without your consent.
[ Want some good Facebook security news? Read
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. ]
Zeus also can press infected PCs into service as nodes in a botnet composed of similar zombie PCs. Such botnets might comprise hundreds or thousands of systems and be tapped by attackers -- or
rented out
-- to serve as spam email relays or malware attack launch pads, or to generate
distributed denial-of-service (DDoS) attacks
.
Not all Zeus infections stem from spam emails. Criminal gangs also regularly post links to malicious websites that launch drive-by attacks that result in Zeus installations. Recent attack campaigns have involved links on supposed NFL fan pages on Facebook, as well as e-commerce sites selling fake Nike shoes, according to Eric Feinberg, founder of the advocacy group
Fans Against Kounterfeit Enterprise
(FAKE).
If you really want to hack someone,
the easiest place to start is a fake Facebook profile
-- its so simple, its stupid, Feinberg told
The New York Times
.
According to Trend Micro, the recent spike in Zeus activity has largely involved two variants of the malware: Citadel, which first appeared in 2011 and is apparently the
brainchild of Russian and Ukrainian programmers
who worked with source code published by Zeus developer; and Gameover, which is designed to steal bank and credit card details and has been distributed via
massive spam campaigns
.
Zeus first shot to cybercrime fame in 2006, gaining notoriety as king of
automated attack toolkits
. Subsequent versions of the malware have continued to add features and functionality. The Zitmo variant, for example, was adapted in 2011 to
target Android mobile devices
and steal the one-time passwords -- known as mobile transaction authentication numbers (mTANs) -- used by many banks.
As of 2010, a basic version of Zeus was
fetching $3,000
, although add-ons could boost the purchase price to above $10,000. As those prices suggest, Zeus attacks can be lucrative. For example, the
Eurograbber campaign
, discovered last year, used Zeus malware to steal an estimated $47 million from more than 30,000 corporate and private banking customers across Europe.
Many different, unconnected Zeus botnets are typically running at any given time. The
Zeus Tracker
project, for example, which counts Zeus command-and-control (C&C) servers, currently reports that its tracking 800 such servers. But related malware variants used by the attackers are detected by antivirus software only about 38% of the time. That low detection rate is typically due to the
malware being polymorphic
, meaning that the attack code is regularly repackaged so that it remains functionally equivalent but doesnt match known-file signatures.

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Zeus Bank Malware Surges On Facebook