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

Additional 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.

Detection

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

Technical Details: Alexey Podrezov, November 26th, 2003;