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RunForestRun Now Encrypts Legitimate JS Files

A few days ago Jindrich Kubec (Avast) pinged me that the RunForestRun malware changed the domain generating algorithm (DGA) and now uses subdomains (instead of .ru) in malicious URLs.

The DGA has changed a bit... it now also generates h.hhrkeezqezsfpelh. waw. pl / runforestrun?sid=botner_api style domains

I decided to take a look at the new scripts and found quite a few very interesting changes. This post will be about those changes.
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Runforestrun and Pseudo Random Domains

22 Jun 12   Filed in Short Attack Reviews with 94 Comments

Today I came across an interesting attack that injects malicious scripts at the very bottom of existing .js files.

Update: at the bottom of this post you’ll find information about how a security hole in Plesk Panel was used to infect websites. Comments are also worth reading.

Update (July 26, 2012): The attack has changed both the injected script and the domain generating algorithm. See details in my follow up article. Information about the Plesk security issues are still can be found in the current post and comments.

The script (surrounded by the /*km0ae9gr6m*/…/*qhk6sa6g1c*/ pair of comments ) looks like this:

km0ae9gr6m script qhk6sa6g1c

Full source code can be found here

On Google diagnostic pages of infected sites you will currently see something like this

Malicious software is hosted on 2 domain(s), including ctonxidjqijsnzny .ru/, znycugibimtvplve .ru/.

I say “currently”, because the most interesting thing about this script is the built-in domain name generator.
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