full-disclosure - New Win32 Worm regsvc32.exe offers rootkit features

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Message-ID: <Pine.LNX.4.44.0403310045170.1235-100000@mailbox.prolocation.net>
From: raymond at prolocation.net (Raymond Dijkxhoorn)
Subject: New Win32 Worm regsvc32.exe offers rootkit
 features

Hi!

> my Symantec AV Corporate Edition v 8.00.9374
> with Scan Engine - 4.1.0.15 and last updates (28/3/2004 rev.50)
> does not found any worm or virus in your file (regsvc32.exe).
> Maybe a new worm or a modified old worm.

The Clam team has added it and it will be pushed in the next DB update:

Date: 30-03-2004 23:16:11 +0200 
 Original Filename: C:\TEMP\infected\dcc\regsvc32.exe 
 Reported virus name: Unknown Virus
 Has been reviewed by: Christoph Cordes
 
 Submission added: Yes (as Worm.Gaobot.6)

> The file try to impersonate real "\WINDOWS\SYSTEM32\regsvr32.exe"
> with a fake name, but instead is a worm compressed with ASPack 2.12.
> If you look at import table, the worm seems to use
> "NetShareEnum", "ShellExecuteA" and winsock API from Windows.
> 
> I think it's not a full-rootkit as you say, but maybe contains some stealth
> code because import "EnumProcessModules" from psapi.dll, used to list
> Windows process list.

Its Phatbot. New variant, one of the zillion variants around :)

Bye,
Raymond.