[virusinfo] W32/Mytob-AB
- From: "Mike" <mikebike@xxxxxxxxx>
- To: virusinfo@xxxxxxxxxxxxx
- Date: Tue, 12 Apr 2005 08:37:34 -0700
From; Sophos Alert System:
Name: W32/Mytob-AB
Type: Win32 worm
Date: 12 April 2005
A virus identity (IDE) file which provides protection is
available now from the Sophos website, and will be incorporated
into the June 2005 (3.94) release of Sophos Anti-Virus.
Customers using EM Library, PureMessage or any of our Sophos
small business solutions will be automatically protected at
their next scheduled update.
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.
Note: The IDE issued for W32/Mytob-AB at 04:55 GMT on 11 April
also contained detection for W32/Mytob-Y, W32/Mytob-Z,
W32/Mytob-AA and W32/Mytob-X. This IDE has now been updated to
enhance detection of W32/Mytob-Z.
Information about W32/Mytob-AB can be found at:
http://www.sophos.com/virusinfo/analyses/w32mytobab.html
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-Y (detected as W32/MyDoom-Gen)
since version 3.92.
W32/Mytob-Y is a mass-mailing worm and backdoor Trojan that targets users of
Internet Relay Chat programs.
The worm is capable of spreading itself using the LSASS (MS04-011) exploit
vulnerability.
When first run W32/Mytob-Y copies itself to the Windows system folder as
XpFirewall.exe and creates the following registry entries:
HKCU\Software\Microsoft\Ole
Windows Service XP
XpFirewall.exe
HKLM\SOFTWARE\Microsoft\Ole
Windows Service XP
XpFirewall.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Windows Service XP
XpFirewall.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Windows Service XP
XpFirewall.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Windows Service XP
XpFirewall.exe
HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Windows Service XP
XpFirewall.exe
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Windows Service XP
XpFirewall.exe
W32/Mytob-Y copies itself to the drive C root folder as:
funny_pic.scr
my_photo2005.scr
see_this!!.scr
The worm also appends the following mappings to the %SYSTEM%\DRIVERS\ETC\HOSTS
file to deny access to anti-virus and 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-Y have the following characteristics:
Subject line:
Error
Status
Server Report
Mail Transaction Failed
Mail Delivery System
hello
<random>
Message text:
Here are your banks documents.
Mail transaction failed. Partial message is available.
The message contains Unicode characters and has been sent as a binary
attachment.
The message cannot be represented in 7-bit ASCII encoding and has been sent as
a binary attachment.
The original message was included as an attachment.
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-Y harvests email addresses from files on the infected computer and
from the Windows address book.
The worm also attempts to set up an FTP server as well as act as an Internet
proxy via GET HTTP commands.
W32/Mytob-Y also drops a file C:\hellmsn.exe. This file is being detected by
Sophos as W32/Mytob-D.
This IDE file also includes detection for:
W32/Mytob-Y
http://www.sophos.com/virusinfo/analyses/w32mytoby.html
W32/Mytob-Z
http://www.sophos.com/virusinfo/analyses/w32mytobz.html
W32/Mytob-AA
http://www.sophos.com/virusinfo/analyses/w32mytobaa.html
W32/Mytob-X
http://www.sophos.com/virusinfo/analyses/w32mytobx.html
Download the IDE file from:
http://www.sophos.com/downloads/ide/mytobab.ide
Download all the IDE files available for the current version of
Sophos Anti-Virus in a single compressed file. The file is
available in two formats:
Zip file:
http://www.sophos.com/downloads/ide/ides.zip
Self-extracting file:
http://www.sophos.com/downloads/ide/ides.exe
Read about how to use IDE files at
http://www.sophos.com/downloads/ide/using.html
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