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The Computer Guys Miami to Fort Lauderdale Since 1994 - Thank You!
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Top 10 malware reported to Sophos in July 2007
This section is for technical experts who want to know more.
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W32/Mytob-AI is capable of spreading through various operating system
vulnerabilities such as LSASS ( MS04-011 )
When first run, W32/Mytob-AI copies itself to the Windows system folder as
svchost32.exe and creates the following registry entries:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
WINRUN
svchost32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
WINRUN
svchost32.exe
HKCU\SYSTEM\CurrentControlSet\Control\Lsa
WINRUN
svchost32.exe
HKCU\Software\Microsoft\OLE
WINRUN
svchost32.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
WINRUN
svchost32.exe
HKLM\SOFTWARE\Microsoft\Ole
WINRUN
svchost32.exe
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
WINRUN
svchost32.exe
W32/Mytob-AI copies itself to the root folder as:
funny_pic.scr
my_photo2005.scr
see_this!!.scr
W32/Mytob-AI will create another file in the root folder named hellmsn.exe.
This file is detected by Sophos as W32/Mytob-D.
W32/Mytob-AI 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-AI have the following characteristics:
Subject line:
Error
Status
Server Report
Mail Transaction Failed
Mail Delivery System
hello
thanks!
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 extensions 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-AI 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-AI (detected as W32/MyDoom-Gen)
since version 3.92.
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