F-Secure Virus Descriptions : MultiDropper-LA

[Summary] | [Detailed Description] | [Detection]

NAME:	MultiDropper-LA
ALIAS:	Neblso.A, W32/MultiDropper-LA

Summary

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

Detailed Description

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.

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.

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Detection

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

[FSAV_Database_Version]

Version=2004-07-27_02

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Writeup: Ero Carrera, July 27th, 2004;

F-Secure Corporation