This is an IRC worm and a VBS overwriting virus generated with
VBSWG virus kit.
VBSWG.AF is written to spread vie email using Outlook Application
but it fails to send the script code as an attachment. Therefore
it sends only clean message with the following contents:
Subject: Antrax Info
si no sabes que es el antrax o cuales son sus efectos aquite
mando una foto para que veas los efectos que tiene.
Nota:la foto esta un poco fuerte.
Since the mass-mailing routine fails to send the script code as an
attachment (antraxinfo.vbs), VBSWG.AF does not spreads via email.
After this the virus adds a registry key 'Antrax' and uses it as an
infection marker so it will not try to excecute the mass-mailing
routine again on already infected machines.
However VBSWG is able to spread via mIRC and Pirch by modifying
the script.ini and events.ini respectively.
It also searches for files with extension .VBS and .VBE and
overwrite them with its code previously saved as antraxinfo.vbs
in Windows System directory.
The virus payload activates on Januarry 26th, when it shows the
following message box:
Antrax Worm By wAsEk
There are four similar variants of this virus. One of them
VBSWG.AH is trying to drop and run a file called Antrax.exe which
is an email bombber called Achis. For more information about
Achis see the description:
However because of bugs in its code VBSWG.AH does not work at
F-Secure Anti-Virus detects all these variants with the current
[Analysis: Katrin Tocheva, F-Secure; October, 2001]