Trojan.Maljava is a harmful Trojan that will force itself inside your computer. Aside from anti-virus protection, it is also important that you must avoid other sources of this Trojan as described on this page.

Trojan.Maljava is a detection method developed to identify harmful Java files. The Trojan will attempt to infect a computer by exploiting one or more software and system weaknesses. This Trojan is effective on invading a target computer in various ways. Through JavaScript files that reside on every malicious web site, it will attack defenseless visitors. Other means to spread Trojan.Maljava is via spam email messages, instant messenger applications and peer-to-peer connections.

Damage Level: High

Systems Affected: Windows 9x, 2000, XP, Vista, Windows 7

Once user executes a copy of Trojan.Maljava, it will drop several files. Defending on the variant, the infection may lead to different computer abnormalities that ranges from mild to severe. Some of the most common defect it can do to a system is explained as follows.

  • Internet browser redirection to explicit web sites
  • Disabled security applications particularly antivirus and firewall applications
  • Mass sending of spam email messages utilizing the compromised system as SMTP server
  • Clogged network and Internet traffic due to Trojan activities
  • Constant pop-up of advertisements when computer is online
  • Search results are redirected to unknown web pages

The most harmful type of this Trojan is the variant that contains a backdoor function. This kind of threat will open a doorway on infected computer to allow remote attacker to gain full access. With this line open, the attacker may perform several harmful actions including the following.

  • Download more threat on the compromised PC
  • Steal sensitive information such as user name and password
  • Monitor Internet activities
  • Log key presses and save the data to a text file
  • Connect to a remote host and update the configuration file of the Trojan
  • Gather essential data like computer name, operating system version, network setup, and hardware/software details

Trojan.Maljava refers to a family of threats with a range of functionalities. They use differ in method of propagation. Some variants intend to use spam email messages to persuade users to open the attached script. Most of these emails are associated with fake notice about airline tickets and holiday greetings.

Some part of the Trojan utilizes unsecure file downloads. Peer-to-peer network connections are among the top favorite den of Trojan.Maljava. It uses this distribution method to target victims that are casually looking for free software download. The Trojan may disguise as popular software, program updates or program patches.

How to Protect Computer From Trojan.Maljava

Use security programs:
– Install a legitimate anti-virus program and make sure that it has the most recent updates.
– Use a firewall to block all unwanted incoming Internet traffic.
– Anti-malware program that don’t have conflict with installed AV program is advisable to be installed with real-time protection.

Updated antivirus program can detect and contain Trojan.Maljava. In the image below, you can see that Symantec Antivirus was able to quarantine the Trojan. It is placed in a safe location where it cannot be executed anymore.


Communication Precautions:
– Be cautious in opening e-mail attachments. Spam messages that pretend to be from a known source may contain infected attached files.
– Never click on a suspicious link sent through instant messaging programs.

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