W32/Mytob-AI is a mass-mailing worm and backdoor Trojan that targets users of Internet Relay Chat programs.
W32/Mytob-AI is capable of spreading through various operating system vulnerabilities such as LSASS ( MS04-011 )
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.
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.
W32/Mytob-AI is a mass-mailing worm and backdoor Trojan that targets users of Internet Relay Chat programs.
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.