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Windows 7: Mebromi: the first BIOS rootkit in the wild

15 Sep 2011   #1
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
Mebromi: the first BIOS rootkit in the wild

In the past few weeks a Chinese security company called Qihoo 360 blogged about a new BIOS rootkit hitting Chinese computers. This turned to be a very interesting discovery as it appears to be the first real malware targeting system BIOS since a well-known proof of concept called IceLord in 2007. The malware is called Mebromi and contains a bit of everything: a BIOS rootkit specifically targeting Award BIOS, a MBR rootkit, a kernel mode rootkit, a PE file infector and a Trojan downloader. At this time, Mebromi is not designed to infect 64-bit operating system and it is not able to infect the system if run with limited privileges.

The infection starts with a small encrypted dropper that contains five crypted resource files: hook.rom, flash.dll, cbrom.exe, my.sys, bios.sys. The goal of these files will be presented later in this analysis.

The infection is clearly focused on Chinese users, because the dropper is carefully checking if the system it’s going to infect is protected by Chinese security software Rising Antivirus and Jiangmin KV Antivirus. To gain access to the BIOS, the infection first needs to get loaded in kernel mode so that it can handle with physical memory instead of virtual memory.

A Guy

My System SpecsSystem Spec
15 Sep 2011   #2

Windows 2000 5.0 Build 2195

Good thing I accidentally discovered UEFI and managed to learn about it and then install it. Protects me from MBR and BIOS rootkits
My System SpecsSystem Spec
15 Sep 2011   #3

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE

When one sees a malware such as this, that is designed to discriminate in that fashion, it makes one wonder what the hacker has against the Chinese?
My System SpecsSystem Spec
15 Sep 2011   #4

Windows 7 Enterprise

Time to move to stay on linux... :P
My System SpecsSystem Spec

 Mebromi: the first BIOS rootkit in the wild

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