F-Secure Virus Descriptions : Mimail.L
[Summary] | [Disinfection] | [Detailed Description] | [Detection]
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Mimail.L worm was found on 1st of December, 2003. It is a variant of
the Mimail worm family.
This worm sends messages which pretend to be very personal and
contain pictures. The attached file is a ZIP that contains the
worm.
The other type of message it sends will look like the recipients
credit card would be billed for buying child porn, possibly
scaring and confusing the recipients.
Manual disinfection of an Mimail.L infected computer consists of
the following steps:
1, Remove the registry value
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run\France]
2, Restart the computer
3, Delete '%WinDir%\svchost.exe' (where %WinDir% is the
Windows Directory, typically c:\windows\ or c:\winnt)
The worm spreads in UPX packed form. The unpacked worm body
is 24608 bytes in size and was written in C language.
Email Spreading
The virus sends two types of messages. One of them is sent with
an infected attachment with the following text:
Hi Greg its Wendy.
I was shocked, when I found out that it wasn't you but your
twin brother!!! That's amazing, you're as like as two
peas. No one in bed is better than you Greg. I remember, I
remember everything very well, that promised you to tell
how it was, I'll give you a call today after 9.
<explicit content removed>
I'm so thankful to you, for acquainted me to your brother.
I think we can do i t on the next Saturday all three
together? What do you think? O yes, as you wanted I've made
a few pictures check them out in archive, I hope they will
excite you, and you will dream of our new meeting...
Wendy.
Attachment: wendy.zip
The other message when sent by the virus does not contain
any attachment but the worm has reportedly been seeded with
the following text and an attachment called 'test.exe':
Good afternoon,
We are going to bill your credit card for amount of $22.95
on a weekly basis. Free pack of child porn CDs is already
on the way to your billing address. If you want to cancel
membership and your CD pack please email order and credit
card details to security@europe.spamhaus.org
Are you ready for all types of underage porn? We have the
best selection for every taste! Just click the secret
links below and have fun:
www.authorizenet.com
disney.go.com
www.spamcop.net
www.carderplanet.net
www.cardcops.com
www.register.com
www.spews.org
www.spamhaus.org
Nude boys under 16!
Nude girls under 16!
Incest, a daddy & a daughter!
We have everything you have ever dreamed for!
This message is meant to scare and confuse the recipient and probably
to hurt the reputation of the organizations mentioned in the mail.
The worm collects email addresses from files on the infected computer.
It recursively searches through the user's document folders and
looks into all the files whose extension is not on the following list
"bmp"
"jpg"
"gif"
"exe"
"dll"
"avi"
"mpg"
"mp3"
"vxd"
"ocx"
"psd"
"tif"
"zip"
"rar"
"pdf"
"cab"
"wav"
"com"
Using its own SMTP engine it sends emails with the malicious
attachment. To find the SMTP server of the target email address
the worm does an MX lookup using a predefined public DNS server.
System Infection
When started, Mimail.L first copies itself to the Windows Directory
as 'svchost.exe'. This copy is added to the registry as
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run\France]
to make sure the worm is started when Windows starts.
The worm creates several temporary files in the Windows directory:
%WinDir%\x8wui12s.tmp - worm packed into a ZIP file
%WinDir%\xu39reu.tmp - copy of the worm
%WinDir%\xu298da.tmp - list of collected email addresses
Payload
Computers infected with Mimail.L perform Distributed Denial-of-Service
attacks on the following sites:
www.authorizenet.com
disney.go.com
www.spamcop.net
www.carderplanet.net
www.cardcops.com
www.register.com
www.spews.org
www.spamhaus.org
Mimail.L also contains this text which is never shown:
*** Made in France. ***
virmakers
Detection in F-Secure Anti-Virus was published in update number:
Version=2003-12-01_03
Write-Up:
Mikko Hypponen, Katrin Tocheva, December 1st, 2003;
Technical Details:
Gergely Erdelyi, December 1st, 2003;
F-Secure Corporation
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