Net-Worm.Win32.Aspxor

Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:

• file viruses
• boot sector viruses
• macro viruses
• script viruses

Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Net-Worm

Net-Worms propagate via computer networks. The distinguishing feature of this type of worm is that it does not require user action in order to spread. This type of worm usually searches for critical vulnerabilities in software running on networked computers. In order to infect the computers on the network, the worm sends a specially crafted network packet (called an exploit) and as a result the worm code (or part of the worm code) penetrates the victim computer and activates. Sometimes the network packet only contains the part of the worm code which will download and run a file containing the main worm module. Some network worms use several exploits simultaneously to spread, thus increasing the speed at which they find victims.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

This malware family is related to the Asprox botnet. These worms can send spam, download and run programs specified by the cybercriminal, and collect the personal data of the user of an infected computer (such as saved passwords and email and FTP credentials). Malware of this family is spread via spam. It may also propagate by searching for vulnerable websites hosted with ASP (Active Server Pages) on Microsoft IIS (Internet Information Server) servers. SQL injection is used to insert redirection code into pages on these websites (in an iframe object). When a user visits the hacked website, the inserted code redirects the user's browser to a series of low-level domains containing malicious JavaScript code. In the process of this redirection the browser ultimately opens a website containing an exploit tailored to a vulnerability in a particular browser or operating system. This code causes the browser to automatically download a copy of Net-Worm.Win32.Aspxor malware to the user's computer.

Top 10 countries with most attacked users (% of total attacks)

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Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com