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TrojanSpy:Win32/Fucobha.A


First posted on 26 October 2011.
Source: SecurityHome

Aliases :

TrojanSpy:Win32/Fucobha.A is also known as Trojan/Win32/Dllbot (AhnLab), Trojan-Downloader.Win32.Agent.tenl (Kaspersky), Mal/Proxy-B (Sophos), TSPY_FUCOBHA.WR (Trend Micro).

Explanation :

TrojanSpy:Win32/Fucobha.A is a trojan that could download arbitrary files, upload files and send details about the affected computer to a remote server named "cloudsbit.com".


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TrojanSpy:Win32/Fucobha.A is a trojan that could download arbitrary files, upload files and send details about the affected computer to a remote server named "cloudsbit.com".



Installation

This malware is installed by a dropper, also identified as TrojanSpy:Win32/Fucobha.A, and is present as the following file:

  • %windir%\wdmaud.drv


When executed, this trojan launches the Windows shell "explorer.exe" and injects "wdmaud.drv" into the launched process and the initial dropper is deleted. When active, the trojan verifies that it is loaded by the process "explorer" and if true, it creates a mutex named "myhorsemutex" or "my_horse_mutex_jd2_new".



Payload

Communicates with a remote server/performs file transfers
TrojanSpy:Win32/Fucobha.A sends the following information about the affected computer to a remote server named "cloudsbit.com":

  • Host name
  • IP address
  • Proxy details
  • User account details
  • Windows system directory details
  • Operating system language
  • Windows version
  • Process ID (PID) of the trojan process


Some versions of this malware may steal logon credentials from certain applications including email applications. The trojan could receive commands from the remote server that instruct the malware to perform the following actions:

  • Download arbitrary files using a user-agent named "mydownload"
  • Upload files using a user-agent named "MyAgent"
  • Execute arbitrary files via a command prompt and redirect the output to a specified file


When commands are successfully executed, the trojan sends a confirmation message and a results message to the remote server.



Analysis by Daniel Chipiristeanu

Last update 26 October 2011

 

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