Webspam is constantly evolving. A while ago a spammer told us spammers had long since moved on from what us anti-spammers were writing about. That webspam had moved on from comment spamming blogs. And I was sure he was right. What I’m seeing now, is the newbies spamming my blog. The spammers who don’t yet know what they’re doing, for the most part, with a few comment spammers who rely on inventive wording thrown in.
Today I’ve been on the trail of a spammer who’s constantly trying new things. He’s been at this for a long time. Eugene Blagodarny (some of you are no doubt tired of my talking about him). Lately he’s been using upload scripts to place spammy pages on otherwise clean sites. Not links to spammy pages, but regular throwaways that redirect to his money sites or his affiliate links. There might be other spammers doing the same thing, I just haven’t found their trails yet.
And this guy is using any upload script he can find. He’s not just searching for specific types of scripts. In one case I confirmed that he misused a custom written script that was used on ONE website.
In addition to any upload script he can get to accept his HTML pages (usually with .htm extension), he’ll leave comments or user profiles anywhere his javascript redirects will work. Some of his favorites are HyperNews (comments), Twiki (user profiles) and SnipSnap (userprofiles with uploads). He’s also (I assume) signed up for user accounts at compuserve in Germany.
He then comment spams other websites with links to his upload pages and redirect enabled comments, in order to get them into search engines. They’re often hidden on the websites he’s uploaded them to, so he needs to get them linked by other means.
What does all this mean?
If you’ve got a website that has an upload script that accepts HTML files, you need to be alert. Either recode to not accept HTML files, have a good admin interface and check it for uploads every day. Or remove the script altogether. Another possible option, if you haven’t been targeted yet, is to add a robots.txt file that bans search engine indexing of the directories your uploaded files are deposited in.
If you’ve got an interactive script on your website, make sure they don’t allow javascript redirects. That includes old scripts for guestbooks, forums etc.
If you’ve got a free website service, such as free homepages, free blogs, free groups, free forums, you need to recode those services so javascript redirects won’t work. Disabling iframes and frames pointing to somewhere else would also be proactive. I know of at least one free webhost who runs scripts every night, looking for certain keywords that spammers tend to use, and then disabling pages en masse. Identifying obfuscated redirects would also help you remove other sites with those redirects on them.