Microsoft sues alleged spammer for gaming Hotmail’s spam filter

Messages marked as ‘not spam’ from phony web mail accounts.

Connecticut spammer Boris Mizhen and several companies controlled by him have been sued by

Microsoft

for sending unwanted email to its customers and for gaming spam filters.

Mizhen has a long history as a spammer. For years he was listed in

Spamhaus

‘s ROKSO list and he was sued by

Microsoft

for sending spam to its web-based

Hotmail

service in 2003. That lawsuit ended in a settlement with Mizhen agreeing to pay

Microsoft

$2 million and to refrain from sending spam to

Hotmail

users.

In a new email campaign, however, Mizhen’s companies once again targeted

Hotmail

users. An associate of Mizhen’s claimed these messages weren’t spam, explaining that many users had moved the messages from their junk folders to their inboxes. However, these user accounts are believed to have been specially created by Mizhen for this purpose.

Many spam filters base their filtering partially on user feedback. Using techniques such as Bayesian filtering, blacklisting and whitelisting, they attempt to learn from end users marking messages as ‘spam’ and ‘not spam’. This case shows that such techniques can be abused by spammers – and developers of spam filters that use these techniques would be wise to keep this in mind when developing their products.

More details are at

Online Media Daily


here

.

Posted on 18 June 2010 by

Virus Bulletin