Threat Description

Mimail.E

Details

Aliases: Mimail.E, W32/Mimail.E@mm, I-Worm.Mimail.e
Category: Malware
Type: Email-Worm
Platform: W32

Summary


Mimail.E worm was found on 1st of November, 2003. It is a close variant of Mimail.C worm. The description of Mimail.C worm variant can be found here:

https://www.europe.f-secure.com/v-descs/mimail_c.shtml



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


The Mimail.E worm is a minor variant of Mimail.C worm.

The differences between these 2 versions are as follows:

1. The Mimail.E worm's file is 10784 bytes long, compressed with UPX file compressor, the unpacked file's size is 23072 bytes.

2. The worm installs itself to Windows folder as CNFRM.EXE file and creates a startup key in the Registry:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]  "Cnfrm32" = "%windir\cnfrm.exe"   

where %windir% is a Windows directory name.

3. The worm performs a DoS (Denial of Service) attack on the following sites:

spews.org  spamhaus.org  spamcop.net  www.spews.org  www.spamhaus.org  www.spamcop.net   

4. The worm spreads itself in the following message:

From:   john@[domain of the recipient]   Subject:   don't be late!     [some random characters]     Body:   Will meet tonight as we agreed, because on Wednesday I don't think I'll make it,   so don't be late. And yes, by the way here is the file you asked for.  It's all written there. See you.   [some random characters]   Attachment: readnow.zip     

The attachment is a ZIP archive that contains the worm's executable file with READNOW.DOC.SCR name.

5. The .E worm variant doesn't have the spying functionality that was present in the .C worm variant.



Detection


Detection in F-Secure Anti-Virus was published on November 1st, 2003 in the following updates:

Detection Type: PC
Database: 2003-11-01_02



Technical Details:Alexey Podrezov, November 3rd, 2003


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