W32/Zotob-H

Please follow the instructions for removing worms.

Please read the instructions for removing W32/Zotob-H.

W32/Zotob-H is a email worm, network worm, and IRC backdoor Trojan for the
Windows platform.

W32/Zotob-H spreads to other network computers by exploiting common buffer
overflow vulnerabilites, including: UPnP (MS05-039) and LSASS (MS04-011).

W32/Zotob-H may also spread via email, sending emails to any addresses it finds
on an infected computer. The worm will be sent as a zipped attachment, and the
emails will have the following characteristics:

Subject:

"Your password has been updated"
"Your password has been successfully updated"
"You have successfully updated your password"
"Your new account password is approved"

"Your Account is Suspended"
"*DETECTED* Online User Violation"
"Your Account is Suspended For Security Reasons"
"Warning Message: Your services near to be closed."
"Important Notification"
"Members Support"
"Security measures"
"Email Account Suspension"
"Notice of account limitation"

Message:

"Dear <name> Member,

You have successfully updated the password of your <name> acccount.

If you did not authorize this change or if you need assistance with your
account, please contact <name> customer service

Please also visit our irc server irc.unixirc.net 6667 #ccpower

Thank you for using <name>!

The <name> Support Team

+++ Attachment: No Virus (Clean)

+++ %s Antivirus - www.<name>"

"Dear user <name>,

It has come to our attention that your <name> User Profile ( x ) records are
out of date. For further details see the attached document.

Please also visit our irc server irc.unixirc.net 6667 #ccpower

Thank you for using <name>.

The <name> Support Team

+++ Attachment: No Virus (Clean)

+++ %s Antivirus - www.<t;name>"

"Dear <name> Member,

We have temporarily suspended your email account <name>.

This might be due to either of the following reasons:

1. A recent change in your personal information (i.e. change of address).

2. Submiting invalid information during the initial sign up process.

3. An innability to accurately verify your selected option of subscription due
to an internal error within our processors.

Please also visit our irc server irc.unixirc.net 6667 #ccpower

Sincerely,The <name> Support Team

+++ Attachment: No Virus (Clean)

+++ %s Antivirus - www.<name>"

"Dear <name> Member,

Your e-mail account was used to send a huge amount of unsolicited spam
messages during the recent week. If you could please take 5-10 minutes out of your
online experience and confirm the attached document so you will not run into any
future problems with the online service.

If you choose to ignore our request, you leave us no choice but to cancel your
membership.

Please also visit our irc server irc.unixirc.net 6667 #ccpower

Virtually yours,

The <name> Support Team

+++ Attachment: No Virus (Clean)

+++ %s Antivirus - www.<name>"

Attachment name:

updated-password
email-password
new-password
password
approved-password
account-password
accepted-password

important-details
account-details
email-details
account-info
document
readme
account-report

The attachments have a document related file extension, followed by many spaces, then one of the following so that the file will be executed when opened:

pif
scr
exe
cmd
bat

W32/Zotob-H runs continuously in the background, providing a backdoor server
which allows a remote intruder to gain access and control over the computer via
IRC channels.

When first run W32/Zotob-H copies itself to <System>\fuck.exe.

The following registry entries are created to run fuck.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
WINDOWS FUCK BY CLASIC
fuck.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
WINDOWS FUCK BY CLASIC
fuck.exe

W32/Zotob-H sets the following registry entries, disabling the automatic startup
of other software:

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

W32/Zotob-H modifies an infected computer's Hosts file as follows, denying
access to those websites specified:

127.0.0.1 www.symantec.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 symantec.com
127.0.0.1 www.sophos.com
127.0.0.1 sophos.com
127.0.0.1 www.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 liveupdate.symantecliveupdate.com
127.0.0.1 www.viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 f-secure.com
127.0.0.1 www.f-secure.com
127.0.0.1 kaspersky.com
127.0.0.1 kaspersky-labs.com
127.0.0.1 www.avp.com
127.0.0.1 www.kaspersky.com
127.0.0.1 avp.com
127.0.0.1 www.networkassociates.com
127.0.0.1 networkassociates.com
127.0.0.1 www.ca.com
127.0.0.1 ca.com
127.0.0.1 mast.mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 www.my-etrust.com
127.0.0.1 download.mcafee.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 nai.com
127.0.0.1 www.nai.com
127.0.0.1 update.symantec.com
127.0.0.1 updates.symantec.com
127.0.0.1 us.mcafee.com
127.0.0.1 liveupdate.symantec.com
127.0.0.1 customer.symantec.com
127.0.0.1 rads.mcafee.com
127.0.0.1 trendmicro.com
127.0.0.1 pandasoftware.com
127.0.0.1 www.pandasoftware.com
127.0.0.1 www.trendmicro.com
127.0.0.1 www.grisoft.com
127.0.0.1 www.microsoft.com
127.0.0.1 microsoft.com
127.0.0.1 www.virustotal.com
127.0.0.1 virustotal.com
127.0.0.1 www.amazon.com
127.0.0.1 www.amazon.co.uk
127.0.0.1 www.amazon.ca
127.0.0.1 www.amazon.fr
127.0.0.1 www.paypal.com
127.0.0.1 paypal.com
127.0.0.1 moneybookers.com
127.0.0.1 www.moneybookers.com
127.0.0.1 www.ebay.com
127.0.0.1 ebay.com

Sophos's anti-virus products include Genotype™ detection technology, which can proactively protect against new threats without requiring an update. Sophos customers have been protected against W32/Zotob-H (detected as W32/Mytob-Fam) since version 3.96.