Mimail is an internet worm spreading via infected emails. The worm uses a built in SMTP engine.
Infected messages has the following fields:
From: admin@%fake email address% where %fake email address% is different every time.
Subject: your account %rnd str% where %rnd str% is different every time.
Hello there, I would like to inform you about important information regarding your email address. This email address will be expiring.
Please read attachment for details.
Best regards, Administrator
Attach: message.zip with "message.html" file.
This HTML file drops the FOO.EXE file (worm copy) into the "Downloaded Program Files" directory and runs it.
(To do this action the worm exploits a vulnerability in Internet Explorer: allows a Java script in the HTML file to get access to disk files without any prompts.)
Worm copies itself to the Windows directory under the name "videodrv.exe" and registers this file in the system registry autorun key:
VideoDriver = %WinDir%\videodrv.exe
The worm also creates the following files in the Windows directory:
exe.tmp - worm in HTML file
zip.tmp - worm's HTML file in ZIP archive (method "stored" - no compression).
eml.tmp - list of emails found on infected machine
(The worm uses its own ZIP file format supporting routine.)
Use antivirus (also check How To Remove section)Startup Optimizer to remove it from startup.
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