Information Security

We're looking for any info or packets that target port 51616.   After witnessing a spike yesterday on his network and checking that our port data [1] corroborated his event, Andrew has written in asking what we know.    

The most useful snapshot of port activity can be seen in this graph image.  I ran the graphs as far back as 2006 and nothing more signifcant was illustrated.   The image below highlights yesterdays events as well as a more curious spike back in March.  These counts do not seem very significant at first look, but they could clearly be telling us something.   

So drop us a comment to share what you know.  We're interested to attribute this traffic to something useful.

[1] https://isc.sans.edu/port.html?port=51616

Update 1: ISC reader Jim suggested that port 51616 is Xsan is Apple Inc.'s storage area network (SAN) or clustered file system for Mac OS X. Xsan enables multiple Mac desktop and Xserve systems to access shared block storage over a Fibre Channel network. With the Xsan file system installed, these computers can read and write to the same storage volume at the same time.

(c) SANS Internet Storm Center. http://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

Original release date: May 20, 2013 | Last revised: May 22, 2013
Systems Affected

• Microsoft Windows systems running Adobe Reader, Acrobat, or Oracle Java

Overview

On May 16, 2013, US-CERT was notified that both www.federalnewsradio[.]com and www.wtop[.]com had been compromised to redirect Internet Explorer users to an exploit kit. As of May 17, 2013, US-CERT analysis confirms that no malicious code remains on either site.

Description

The compromised websites were modified to contain a hidden iframe referencing a JavaScript file on a dynamic-DNS host. The file returned from this site was identified as the Fiesta exploit kit. The kit uses one of several known vulnerabilities to attempt to download an executable:

• CVE-2009-0927: Stack-based buffer overflow in Adobe Reader and Adobe Acrobat

• CVE-2010-0188: Unspecified vulnerability in Adobe Reader and Acrobat

• CVE-2013-0422: Multiple vulnerabilities in Oracle Java 7 before Update 11

Any systems visiting running vulnerable versions of Adobe Reader or Acrobat or Oracle Java may have been compromised.

Impact

The exploit kit, once successful, delivers and executes a known variant of the ZeroAccess Trojan. Additionally, according to open source reporting, the malware also downloads and installs a variant of FakeAV/Kazy malware.

The ZeroAccess Trojan attempts to beacon to one of two hardcoded command-and-control addresses, 194[.]165[.]17[.]3 and 209[.]68[.]32[.]176. The beaconing occurs using an HTTP GET using the Opera/10 user-agent string.

After beaconing, the malware then downloads a custom Microsoft Cabinet file and the malware uses port 16464/udp to connect to the peer-to-peer network. This cabinet file contains several lists of IP addresses, as well as a fake flash installer.

Solution

Apply Updates

Updated software that addresses the vulnerabilities referenced in this incident has been available for years. It is imperative to apply current security updates to software that is commonly targeted by attackers.

• Adobe provided updates for the Adobe Reader and Acrobat vulnerabilities (CVE-2009-0927 and CVE-2010-0188) in Adobe Security Bulletins APSB09-04 and APSB10-07 respectively.
• Oracle released Oracle Security Alert for CVE-2013-0422 to address the Java vulnerability.

In order to defend against additional vulnerabilities, install the most recent versions of Adobe Reader, Acrobat, and Oracle Java. At the time of publication, Adobe Security Bulletin APSB13-15 documents current security updates for Adobe Reader and Acrobat, and Oracle Java SE Critical Patch Update Advisory - April 2013 documents vulnerabilities addressed by Java 7 Update 21.

Identify Compromised Systems

Monitor activity to the following IP addresses as a potential indicator of compromise where permitted and practical:

• 209[.]68[.]32[.]176
• 194[.]165[.]17[.]3

References

• WTOP and Federal News Radio Websites Back After Cyber Attack
• K.I.A. – WTOP.com, FedNewsRadio and Tech Blogger John Dvorak Blog Site Hijacked – Exploits Java and Adobe to Distribute Fake A/V
• Stack-based buffer overflow in Adobe Reader and Adobe Acrobat
• Unspecified vulnerability in Adobe Reader and Acrobat
• Adobe Security Bulletin APSB09-04
• Adobe Security Bulletin APSB10-07
• Adobe Security Bulletin APSB13-15
• Multiple vulnerabilities in Oracle Java 7 before Update 11
• Oracle Security Alert for CVE-2013-0422
• Oracle Java SE Critical Patch Update Advisory - April 2013

Revision History

• Initial release
• Updated Solution section

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