Analysis of a malicious backdoor serving Blackhole exploit pack found on Linux Apache webserver compromised by malware dubbed Linux/Cdorked.A, together with remediation tool and techniques.

More than half of all web servers on the Internet use Apache, so when we discovered a malicious Apache module in the wild last month, we were understandably concerned.

In July 2012, our virus laboratory came across what we first thought was a new family of malware. The threat spread by infecting Portable Executable or PE files used by Windows, but this malware also infected systems through remote desktop and network shares. After further analysis, we realized we were dealing with a new version

Six months ago, Flashback was attracting a lot of attention from researchers and media due to its wide spread and interesting features. Since then, we have witnessed its operator abandoning control of the botnet by shutting down its latest command and control server. This happened in May this year. The number of infected systems has

For years, cyber criminals have organized their operations and traded resources through discussion forums and auction sites. One popular item to trade is access to virus infected PCs for cash. These trading schemes are often called pay-per install (PPI) programs. We have recently started an investigation on a new type of pay-per install program, this

The biggest Mac botnet ever encountered, the OSX/Flashback botnet, is being hit hard. On April 12th, Apple released a third Java update since the Flashback malicious code outbreak. This update includes a new tool called MRT (Malware Removal Tool) which allows Apple to quickly push malware removal code to their user base. The first mission

Yesterday, ESET announced the discovery of a new threat against the Apple Mac OS X platform. Today, we have found a new version of the same threat. The new version is similar to the previous version with two important differences. The first addition to this threat is that it now implements persistence on an infected

As part of our botnet monitoring initiative, we recently stumbled across an interesting piece of news. The Win32/Kelihos botnet, a likely successor to Win32/Waledac and Win32/Nuwar (the infamous Storm worm), is now sending spam to recruit money mules. We captured two different spam templates used by the bot to generate spam messages. As shown in

Our colleagues Aleksandr Matrosov and Eugene Rodionov are tracking the evolution of TDL4 (also known as Win32/Olmarik). The following is a report on the latest TDL4 update, released last week. In our previous blog post, we described how the latest Microsoft Security Update modified the Windows OS loader (winloader.exe) to fix a vulnerability that allowed

It appears that the group behind the Win32/Swizzor malware family has put an end to their operation. This malware family has been around since 2002. Security companies have seen hundreds of thousands of unique binaries classified as this family, which was installed on PCs through "affiliate" programs. The malware is used to display unsolicited advertisements