Monday, November 30, 2009

IRS Spam Campaign leads to low detection malware

We're getting tons of strange IRS spam this morning.

Subjects like:

IRS - Please Read!
IRS - Tax Refund Notification!
IRS e-file refund notification!
IRS REFUND Notification - Please Read This!
IRS: Your Tax Refund Notification!
Notification - Tax Refund!
Notification - Your Tax Refund!
Tax Refund!
US Internal Revenue Service!
US Treasury Department - Tax Refund!

Bodies look like this:


Internal Revenue Service
United States Department of the Treasury
After the last annual calculations of your fiscal activity we have determined that you are eligible to receive 533.41$ tax refund under section 501(c) (10) of the Internal Revenue Code. Please submit the Tax Refund Request Form and allow us 3-9 days to process it.

Yours faithfully,
Sarah Hall Ingram, Commissioner

This notification has been sent by the Internal Revenue Service, a bureau of the Department of the Treasury.

This would be a great place to remind people that if you have turned "javascript" on globally, when you visit ANY website, the code on that website runs, and so does the code on any website that is being loaded into your current webpage with an iframe.

In this case, there's an iframe that draws source from here, being blocked by Google Safe Browsing:

An encrypted javascript is supposed to load from /ssp/index.php on each of the sites below.

The javascript on this page causes the page:


to be loaded, which drops an executable file called "load.exe". We expect that this page is regularly changed to allow a variety of malware to be dropped. At the moment, what it is dropping is a file that has these characteristics:

My Microsoft Forefront calls that: "Trojan:Win32/Oficla.E"
File size: 19968 bytes
MD5 : 8c111a22d26c84dffe3bc3e03907bc28

A VirusTotal Report gives 5 of 41 detects, meaning that MOST anti-virus software will currently return "no virus found" if you scan the file.

As I was working through my analysis, I found that this has actually already been written up quite nicely by CA in their Security Advisor blog by Mary Grace Gabriel.

Here's a list of webpages we've seen so today (November 30th):

These have been shared with appropriate authorities and will hopefully be shut down soon!

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Trying a new setting. After turning on comments, I got about 20-30 comments per day that were all link spam. Sorry to require login, but the spam was too much.