Threat Description

Bifrose.EE

Details

Aliases: Bifrose.EE, Bifrose, Backdoor.Win32.Bifrose.ee
Category: Malware
Type: Backdoor
Platform: W32

Summary



Bifrose is a stealthy backdoor that allows remote access to infected machine. It is usually installed to system by a trojan dropper.



Removal



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Technical Details



Installation to system

When run, the backdoor copies itself under %SysDir% directory using the name 'syspare.exe'. It installs the following registry keys to make sure it will be executed next time the system is started:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
 "syspare.exe" = "syspare.exe"
 [HKLM\Software\Microsoft\Active Setup\Installed Components\{9B71D88C-C598-4935-C5D1-43AA4DB90836}]
 "stubpath.exe" = "syspare.exe"


The backdoor also creates the following registry key for storing information:

[HKLM\Software\Wget]

Backdoor

After the installation, Bifrose tries to locate a running web browser and inject code into it. The injected code is the actual backdoor. The backdoor starts to communicate with the server part using specially crafted HTTP queries. The server can instruct the backdoor to execute the following actions:

Basic file operations (copy, delete, rename, find, execute)
 Download/upload files
 Process operations (list, kill)
 Registry operations (create/delete keys/values)
 Create screenshots of the desktop



Detection



Detection Type: PC
Database: 2005-09-24_01



Technical Details: Jarkko Turkulainen; October 4th, 2005


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