Summary

Files detected as MultiDropper-LA drop already detected worms into the system's temporary files folder and execute them.

Additional Details

We have received four samples which, upon being executed, will drop two files into the system's temporary files folder. The dropped files are old malware, already detected by F-Secure Anti-Virus.

Additional Details

All the variants we received drop two files. We now provide their filenames and current detection results.

%Temp%/document.txt .exe Infected: W32/NetSky.P@mm %Temp%/your_details.exe Infected: I-Worm.Sobig.f
%Temp%/document.txt .exe Infected: W32/NetSky.P@mm %Temp%/msblast.exe Infected: Worm.Win32.Lovesan.a
%Temp%/document.txt.jpg Infected: W32/NetSky.P@mm %Temp%/msbLAST.EXE-1C3A3376.pf.exe Not an executable
%Temp%/your_details.exe Infected: I-Worm.Sobig.f %Temp%/msblast.exe Infected: Worm.Win32.Lovesan.a
Afterwards those files are run, triggering all the known effects produced by those worms.

Detection

F-Secure Anti-Virus detects W32/MultiDropper-LA starting from the following update:

[FSAV_Database_Version]
Version=2004-07-27_02

Writeup: Ero Carrera, July 27th, 2004;