Threat Description

Mimail.K

Details

Aliases:Mimail.K, W32/Mimail.K@mm, I-Worm.Mimail.k, I-Worm.Mimail.gen
Category:Malware
Type:Email-Worm
Platform:W32

Summary



Mimail.K worm was found on 26th of November, 2003. It is a minor variant of Mimail.E worm. The description of Mimail.E worm variant can be found here:

http://www.europe.f-secure.com/v-descs/mimail_e.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

You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



The Mimail.K worm is a minor variant of Mimail.E worm. The differences between these 2 versions are as follows:

1. The worm installs itself to Windows folder as SYSLOAD32.EXE file and creates a startup key in the Registry:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
 "SystemLoad32" = "%windir\sysload32.exe"
 

where %windir% is a Windows directory name.

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

darkprofits.cc
 darkprofits.ws
 www.darkprofits.cc
 www.darkprofits.ws
 

Like Mimail.E, this worm variant spreads itself in the messages that look like that:

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.

F-Secure Anti-Virus already detects this worm generically as 'I-Worm.Mimail.gen'.





Technical Details: Alexey Podrezov, November 26th, 2003


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