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  6. Backdoor:W32/Agent.IFX

Backdoor:W32/Agent.IFX

Name : Backdoor:W32/Agent.IFX
Detection Names : Trojan.Win32.Agent.aulk
Aliases : Generic Backdoor Trojan (McAfee)
Sus/Dropper-A (Sophos)
Backdoor:Win32/Koutodoor.A (Microsoft)
Size:37376
Category:Malware
Type:Backdoor
Platform:W32

Summary

Backdoors are Remote Administration Tools (RAT) that expose infected machines to external control via the Internet.

Additional Details

Installation

Creates these files:

  • %appdata%\Microsoft\Internet Explorer\Quick Launch\Internet Explorer.lnk
this creates a quicklaunch IE that opens the page www.6700.cn
  • %favorites%\.url
this creates a "favorites" link in IE to the page www.6700.cn
  • %windir%\system32\[RANDOM].dll
  • %windir%\system32\drivers\[RANDOM].sys
  • %windir%\system32\[RANDOM].bat

Execution

The malware will launch itself by adding this entry into registry :

  • HKLM\System\CurrentControlSet\Services\[RANDOM]
ImagePath = system32\drivers\[RANDOM].sys
     
It also changes the IE start page to:

  • HK_USERS\[...]\Microsoft\Internet Explorer\Main Start Page = "www.6700.cn?tn=1027271"

Attempts to connect to:

  • www. buyaohenchang. cn/api.php?xxxxxxx
www. woyaochidongxi. com/update.php?xxxxx

When first executed, the malware will create the files listed above. It will then execute the batch file to delete itself.

The DLL file and driver are also installed into the system. From then on the DLL and driver will provide the backdoor functionality.