Trojan:W32/AutoIt.X silently downloads, installs and executes files on the infected system.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
The malware may also hijack the web browser by making unauthorized changes to the search and start pages. AutoIt.X is a script file converted to an executable file using AutoIt.
AutoIt.X may be distributed by malicious Java Script Trojans (detected as variants of Exploit:JS/ADODB.Stream) embedded on websites. The Script contain exploit code targeting a vulnerability in the Internet Explorer web browser allowing remote code execution in the ADODB Stream object in ActiveX control. On execution, the Script forces the targeted computer to execute AutoIt.X.
The Script may also be delivered to an unsuspecting user at through malicious links spammed in Instant Messaging (IM) chat messages from the Yahoo! Messenger application. Below is a sample message:
Any of the following message strings may be used:
AutoIt.X is able to hijack the IM chat application to send out its malicious chat message. The program constantly searches for the string title "Yahoo! Messenger" in the Windows Title Bar to determine if the application is open. When the string found, AutoIt.X will secretly and randomly input any of the above messages, every 180 seconds.
Clicking on the link in the message directs the user to malicious page containing the malicious Script. The site may be one of the following:
On execution, AutoIt.X attempts to download a copy of itself from the following site:
The downloaded file is saved with the following filename:
AutoIt.X changes the settings for the web browser's Home Page, Yahoo Buzz and Yahoo Launchcast links to the following site:
It also changes the Windows Title of Internet Explorer to the following:
To enable its automatic execution on startup, it creates the following registry launch point:
It locks the home page in Internet Explorer by modifying the following registry entry:
The value of Homepage varies between users. Homepage="0" will unlock the homepage settings.
It also disables Task Manager and Registry Editor by creating the following registry entries:
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