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Trojan.Dropper.Delf.HS

HIGH
LOW
above 18K
(Backdoor.Win32.IRCBot.acd, Trojan.MulDrop.7373, W32.SillyIRC, Backdoor:Win32/IRCbot.OP, W32/Backdoor.AZWJ)

Symptoms

Presence of %system_dir%\sysprinters.dll and %windir%\myalbum2007.zip

High processor usage.

Removal instructions:

Please let BitDefender disinfect your files.

Analyzed By

Marius Vanta, virus researcher

Technical Description:

This is a trojan which has the capabilities to drop and inject malware code into legitimate processes.

The variant having a higher spread comes with an embedded IM worm which is detected as Win32.Worm.Potos.A . It drops the worm as %system%\sysprinters.dll and then a copy of the whole package as %windir%\myalbum2007.zip.

The worm will run as a remote thread in explorer.exe. In order to infect other computers, the worm will try to fool users to download myalbum2007.zip pretending there are some pictures in the archive.