Upon execution, this malware creates the mutex _Win_Loader_ to ensure that only one instance of itself is running in memory.

Additionally, it drops the following files in the affected system:

• %windir%winlogon32.exe - A copy of itself (Detected as Trojan-Dropper.Win32.Small.qp)
• %windir%winlogon32.dll - Another malware file (Detected as Trojan-Downloader.Win32.Small.anj)
• %windir%prefoct.dat - An empty file

As a stealth mechanism, it loads the dropped DLL, winlogon32.dll, under the legitimate process: lsass.exe.

Trojan-Downloader.Win32.Small.anj, on the other hand, creates the mutex _Win_Loader__Win_Loader_.

This malware attempts to connect to the following web sites to possibly download other malicious components:

• http://www.max-stats.com/l/[REMOVED].php?i=21
  Data downloaded is saved in the file, %windir%prefoct.dat
• http://www.teen4-sex.com/[REMOVED].dat
  Data downloaded is saved in the file, %wndir%\_tmp0232.exe
  

Small.QP then executes the downloaded file, _tmp0232.exe.
Note: Both download sites are unavailable at the time of writing.

There are additional details on Small.QP on F-Secure's Weblog.

Last update 01 March 2007

 

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