Spammers and malware pushers have turned in increasing numbers to the URL shortening services such as TinyURL, SNURL, bit.ly and is.gd as a way of getting by spam filters that recognize the actual URLs to spam and malware sites.
Shortened URLs are changed from the actual address to an address that appears as the URL shortening service’s address along with an additional identifier. So, for example, the URL for this article, http://www.TheInternetPatrol.com/spammers-turn-to-short-url-services-to-cloak-spammed-sites-urls, becomes http://tinyurl.com/lng2bo.
We first reported on spammers using TinyURL over a year ago, but it seems that now it’s on the rise. In fact, the Internet security experts at MessageLabs said this week that they have seen what is being termed a “dramatic spike” in spam which contains links hidden behind shortened URLs.
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By cloaking the actual target domain and URL behind a shortened URL, the spammers are able to by-pass many of the anti-spam mechanisms that are ready to zap any email containing the actual URL for the spam or malware domain.
Says MessageLabs spokesperson, Matt Sergeant, “Usually when we see a spike of this nature it tends to indicate that a spammer has found some method of automating the creation of these short URLs.”
Which also means that, hopefully, the URL shortening services being gamed are working right now to find a way to stop it. But, as is always the case in the spam wars, each escalation is met by the other side with another escalation.
It’s all just one big game of technical one-upmanship.
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