Security Response

Contribution: Takayoshi Nakayama

I was going through some files we acquired related to targeted attacks the other day and an unusual set of files caught my eyes. We did some analysis on the files and it turns out a pair of files in the set exploits a vulnerability we have not seen in the wild before. Microsoft is aware of the issue and notes users who have applied MS11-073 are fully protected.

The files stand out from the common targeted attacks because a Microsoft Word document file is paired with a .dll file. Usually, targeted attacks involve one file which drops malware. The pair would most likely arrive to the target wrapped in an archive file attached to an email. It is common to see document files sent by email inside an archive, but typically, you would not see .dll files ever sent by email.

The exploit makes use of an ActiveX control embedded in a Word document file....

Thanks to Eric Chien for his assistance with this research.

Introduction

We recently came across a new piece of Android malware, first highlighted by NC State’s Xuxian Jiang, and began investigating the command-and-control (C&C) servers associated with the threat. The malware was discovered on a third party marketplace (not the Android Market) and is bundled with a legitimate application for configuring phone settings. Trojanized applications are a well known infection vector for Android malware, as they allow malware to be distributed while retaining the appearance of a legitimate application.

Analysis of these servers indicate the total number of infected devices connected to the botnet over its entire life span numbered in the hundreds of thousands. The number of infected devices able to generate revenue on any...

Last week, we posted a blog informing Android users of the discovery of new versions of Android.Tonclank, which we have named Android.Counterclank. The blog generated a bit of discussion over whether these new versions should be a concern to Android users. When classifying applications, our focus is on whether users want to be informed of the application's behavior, allowing them to make a more informed choice regarding whether to install it.

The situation we find ourselves in is similar to when Adware, Spyware, and Potentially Unwanted Applications first made appearances on Windows. Many security vendors did not initially detect these applications, but eventually, and with the universal approval of computer users, security companies chose to notify users of these types of applications...

Symantec has identified multiple publisher IDs on the Android Market that are being used to push out Android.Counterclank. This is a minor modification of Android.Tonclank, a bot-like threat that can receive commands to carry out certain actions, as well as steal information from the device.

For each of these malicious applications, the malicious code has been grafted on to the main application in a package called “apperhand”. When the package is executed, a service with the same name may be seen running on a compromised device. Another sign of an infection is the presence of the Search icon above on the home screen.

The combined download figures of all the malicious apps indicate that Android....