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* Wells Fargo website facing lingering problems

* US Bancorp says working with federal officials

* PNC, also threatened, says taking precautions

By Rick Rothacker

Sept 26 (Reuters) – Some U.S. Bancorp and PNC

Financial Services customers were having trouble

accessing the banks’ websites on Wednesday, as U.S. financial

institutions appear to be threatened by another round of cyber

attacks.

Wells Fargo & Co also faced lingering problems with

its website after customers had intermittent access issues on

Tuesday, a spokeswoman for the bank said.

U.S. Bancorp is experiencing “unusual and high-traffic

volume” on its site that is designed to slow down the system,

bank spokesman Tom Joyce said. The problem is similar to what

other banks have faced in the past week, he said.

“We are working closely with federal law enforcement

officials to address this issue,” he said. Customers data and

funds are not at risk, he added.

A PNC spokesman said some if its customers may be

experiencing difficulty logging into the bank’s website on the

first attempt. “We are aware of the situation and are working to

restore full access,” spokesman Fred Solomon said.

The attacks came after a posting on the Internet on Tuesday

by an unknown person, calling for cyber attacks this week

against Wells Fargo, U.S. Bancorp and PNC. A similar posting

last week warned of attacks against Bank of America Corp

and the New York Stock Exchange.

The person who posted the message on a site called

pastebin.com said the attacks will continue until the film that

had stirred anti-U.S. protests across the Middle East was

removed from the Internet.

“Obviously, it looks coordinated,” said Jeff Herdell,

founder of a website called Sitedown.co, which has been tracking

customer complaints about the banks’ websites.

So-called denial-of-service campaigns are among the oldest

types of cyber attacks and do not require highly skilled

computer programmers or advanced expertise, compared with

sophisticated and destructive weapons like Stuxnet, a virus

widely believed to have been developed by the United States to

damage Iran’s nuclear program.

But the attacks can still be disruptive: If a bank’s website

is repeatedly shut down, the attacks can hurt its reputation,

affect customer retention and cause revenue losses as customers

cannot open accounts or conduct other business.

The attacks also cost banks because they have to add staff

to handle phone calls and pay for additional network bandwidth.

Senator Joseph Lieberman, chairman of the Senate’s Homeland

Security and Governmental Affairs Committee, said on Friday that

he believes Iran was behind the attacks.

“I think this was done by Iran and the Quds Force, which has

its own developing cyber attack capability,” Lieberman said

during a taping of C-SPAN’s “Newsmakers” program. The Quds Force

is a covert arm of Iran’s Revolutionary Guards.

Reuters reported on Friday that Iranian hackers have

repeatedly attacked Bank of America, JPMorgan Chase & Co

and Citigroup Inc over the past year as part of a broad

cyber campaign targeting the United States.

The attacks, which began in late 2011 and escalated this

year, have primarily been “denial of service” campaigns that

disrupted the banks’ websites and corporate networks by

overwhelming them with incoming web traffic, said sources.