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In the wild:
- Saturday, August 18, 2007
Method of propagation:
• F-Secure: Email-Worm:W32/Mytob.FP
• Grisoft: I-Worm/Mydoom.DH
Platforms / OS:
• Windows 98
• Windows 98 SE
• Windows NT
• Windows ME
• Windows 2000
• Windows XP
• Windows 2003
• Uses its own Email engine
• Registry modification
• Third party control
It copies itself to the following location:
It copies itself within an archive to the following location:
It deletes the initially executed copy of itself.
The following files are created:
– A file that is for temporary use and it might be deleted afterwards:
The following registry key is added in order to run the process after reboot:
• mzupdate =
It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:
The sender address is spoofed.
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.
– Email addresses found in specific files on the system.
– Generated addresses
One of the following:
• RE: hey, how are ya?
• RE: long time no see!
• Urgent Announcement
• Important Announcement
• RE: hey, hows it going?
• RE: Your details
• Hey, congratulations!
• RE: You have been Approved
In some cases the subject might also be empty.
Furthermore the subject line could contain random letters.
– In some cases it may be empty.
– In some cases it may contain random characters.
The body of the email is one of the lines:
• See attached document for details.
• Please see attached document for more information.
• This message could not be displayed. It has been attached to this email instead.
• Please open the attached document. It contains important information.
The filename of the attachment is constructed out of the following:
– It starts with one of the following:
%random character string%
The file extension is one of the following:
The attachment is a copy of the malware itself.
The attachment is an archive containing a copy of the malware itself.
The email may look like one of the following:
It searches the following files for email addresses:
Address generation for TO and FROM fields:
To generate addresses it uses the following strings:
• sandra; linda; julie; jimmy; jerry; helen; debby; claudia; brenda;
anna; alice; brent; adam; ted; fred; bill; stan; smith; steve; matt;
dave; dan; joe; jane; bob; robert; peter; tom; ray; mary; serg; brian;
maria; leo; jose; andrew; george; david; kevin; mike; sam; james;
john; jim; jack
It combines this with domains from the following list or from addresses found in files on the system
The domain is one of the following:
It does not send emails to addresses containing one of the following strings:
• accoun; certific; listserv; ntivi; support; icrosoft; admin; page;
the.bat; gold-certs; feste; submit; not; help; service; privacy;
somebody; soft; contact; site; rating; bugs; you; your; someone;
anyone; nothing; nobody; noone; webmaster; postmaster; samples; info;
root; mozilla; utgers.ed; tanford.e; pgp; acketst; secur; isc.o;
isi.e; ripe.; arin.; sendmail; rfc-ed; ietf; iana; usenet; fido;
linux; kernel; google; ibm.com; fsf.; gnu; mit.e; bsd; math; unix;
berkeley; foo.; .mil; gov.; .gov; ruslis; nodomai; mydomai; example;
inpris; borlan; sopho; panda; hotmail; msn.; icrosof; syma; avp; .edu;
-._!; -._!@; abuse; www
Prepend MX strings:
In order to get the IP address of the mail server it has the ability to prepend the following strings to the domain name:
• io.phat********** : 7001
Sends information about:
• Current malware status
Remote control capabilities:
• Delete file
• Download file
• Execute file
• Terminate malware
The malware program was written in MS Visual C++.
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
Description inserted by Andrei Gherman on Monday, August 20, 2007
Description updated by Andrei Gherman on Monday, August 20, 2007