[virusinfo] W32/Mytob-AO
- From: "Mike" <mikebike@xxxxxxxxx>
- To: virusinfo@xxxxxxxxxxxxx
- Date: Tue, 07 Jun 2005 23:41:34 -0700
From; Sophos Alert System:
Name: W32/Mytob-AO
Aliases: WORM_MYTOB.EY, Net-Worm.Win32.Mytob.t
Type: Win32 worm
Date: 8 June 2005
Sophos has issued protection for W32/Mytob-AO.
At the time of writing, Sophos has received no reports from
users affected by this worm. However, we have issued this
advisory following enquiries to our support department from
customers.
Customers using EM Library, Enterprise Console, PureMessage or
any of our Sophos small business solutions will be automatically
protected at their next scheduled update.
Information about W32/Mytob-AO can be found at:
http://www.sophos.com/virusinfo/analyses/w32mytobao.html
W32/Mytob-AO is a mass-mailing worm and backdoor Trojan that targets users of
Internet Relay Chat programs.
W32/Mytob-AO is capable of spreading through various operating system
vulnerabilities such as LSASS (MS04-011).
The patch for this vulnerability can be obtained from the Microsoft website:
MS04-011
When first run, W32/Mytob-AO copies itself to the Windows system folder as
taskgm.exe and creates the following registry entries:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
WINTASK
taskgm.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
WINTASK
taskgm.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
WINTASK
taskgm.exe
HKCU\Software\Microsoft\OLE
WINTASK
taskgm.exe
HKLM\SOFTWARE\Microsoft\Ole
WINTASK
taskgm.exe
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
WINTASK
taskgm.exe
HKCU\SYSTEM\CurrentControlSet\Control\Lsa
WINTASK
taskgm.exe
W32/Mytob-AO copies itself to the root folder as:
funny_pic.scr
my_photo2005.scr
see_this!!.scr
W32/Mytob-AO will create another file in the root folder named hellmsn.exe.
This file is detected by Sophos as W32/Mytob-D.
W32/Mytob-AO also appends the following to the HOSTS file to deny access to
security-related websites:
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 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 www.microsoft.com
127.0.0.1 www.trendmicro.com
Emails sent by W32/Mytob-AO have the following characteristics:
Subject line:
Error
Status
Server Report
Mail Transaction Failed
Mail Delivery System
hello
thanks!
read it immediately
Good day
<blank>
<random characters>
Message text:
Here are your banks documents.
The original message was included as an attachment.
The message cannot be represented in 7-bit ASCII encoding and has been sent as
a binary attachment.
The message contains Unicode characters and has been sent as a binary
attachment.
Mail transaction failed. Partial message is available.
The attached file consists of a base name followed by the extentions BAT, CMD,
PIF, SCR, EXE or ZIP. The worm may optionally create double extensions where
the first extension is DOC, TXT or HTM and the final extension is PIF, SCR, EXE
or ZIP.
W32/Mytob-AO harvests email addresses from files on the infected computer and
from the Windows address book.
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/Mytob-AO (detected as W32/Mytob-Fam)
since version 3.92.
The W32/Mytob-AO virus identity file (IDE) includes detection for:
W32/Mytob-V
http://www.sophos.com/virusinfo/analyses/w32mytobv.html
Troj/Singu-J
http://www.sophos.com/virusinfo/analyses/trojsinguj.html
Troj/LegMir-AES
http://www.sophos.com/virusinfo/analyses/trojlegmiraes.html
Troj/FTeen-C
http://www.sophos.com/virusinfo/analyses/trojfteenc.html
Troj/Dropper-AZ
http://www.sophos.com/virusinfo/analyses/trojdropperaz.html
Customers with 3.xx or lower versions of Sophos Anti-Virus,
who are not running EM Library, can manually download the IDE
for W32/Mytob-AO from:
http://www.sophos.com/downloads/ide/mytobao.ide
Read about how to use IDE files at
http://www.sophos.com/support/knowledgebase/article/363.html
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