TrojanDownloader:Java/Exdoer

Posted: December 16, 2011

Threat Metric

The Threat Meter is a malware assessment that SpywareRemove.com's research team is able to give every identifiable malware threat. Our Threat Meter includes several criteria based off of specific malware threats to value their severity, reach and volume. The Threat Meter is able to give you a numerical breakdown of each threat's initial Threat Level, Detection Count, Volume Count, Trend Path and Percentage Impact. The overall ranking of each threat in the Threat Meter is a basic breakdown of how all threats are ranked within our own extensive malware database. The scoring for each specific malware threat can be easily compared to other emerging threats to draw a contrast in its particular severity. The Threat Meter is a useful tool in the endeavor of seeking a solution to remove a threat or pursue additional analytical research for all types of computer users.

The following fields listed on the Threat Meter containing a specific value, are explained in detail below:

Threat Level: The threat level scale goes from 1 to 10 where 10 is the highest level of severity and 1 is the lowest level of severity. Each specific level is relative to the threat's consistent assessed behaviors collected from SpyHunter's risk assessment model.

Detection Count: The collective number of confirmed and suspected cases of a particular malware threat. The detection count is calculated from infected PCs retrieved from diagnostic and scan log reports generated by SpyHunter.

Volume Count: Similar to the detection count, the Volume Count is specifically based on the number of confirmed and suspected threats infecting systems on a daily basis. High volume counts usually represent a popular threat but may or may not have infected a large number of systems. High detection count threats could lay dormant and have a low volume count. Criteria for Volume Count is relative to a daily detection count.

Trend Path: The Trend Path, utilizing an up arrow, down arrow or equal symbol, represents the level of recent movement of a particular threat. Up arrows represent an increase, down arrows represent a decline and the equal symbol represent no change to a threat's recent movement.

% Impact (Last 7 Days): This demonstrates a 7-day period change in the frequency of a malware threat infecting PCs. The percentage impact correlates directly to the current Trend Path to determine a rise or decline in the percentage.

Threat Level:	9/10
Infected PCs:	7

First Seen:	December 16, 2011
Last Seen:	March 6, 2024
OS(es) Affected:	Windows

SpywareRemove.com security analysts have diagnosed the computer security threat TrojanDownloader:Java/Exdoer, as a Trojan reportedly related to a dropper infection that was specifically designed to target and attack the Java vulnerability outlined in CVE-201-0840.

Outlining the Basics of a TrojanDownloader:Java/Exdoer Infection

The Trojan has also been discovered functioning under several other aliases, a few of which have been reported as:

- Exploit-CVE2010-0840 [Kaspersky Labs]
- Troj/JavaDI-BR [Sophos]
- JAVA/Exdoer.BE.2 [Avira]
- Java.Downloader.224 [Dr. Webb]
- Java/Agent.DQ [Norman]

Regardless of the exact identified name or alias that TrojanDownloader:Java/Exdoer may be working under, on any given system, this malicious threat poses a severe security risk that is able to drop all kinds of corrupt data onto the computers.

Whenever TrojanDownloader:Java/Exdoer is able to exploit the Java vulnerability and infect a computer successfully, there is a very good chance that this Trojan will be able to allow for all kinds of remote code execution.

This particular corrupt activity can be witnessed whenever a user is utilizing a compromised system with a vulnerable version of Sun Java and visits a website that maintains the class. When this happens, security checks can be easily bypassed, which allows TrojanDownloader:Java/Exdoer to execute a remote, arbitrary code successfully.

Categorized as a dangerous security violation, this Trojan needs to be completely removed from all infected systems, as soon as TrojanDownloader:Java/Exdoer's presence has been discovered lurking on them. SpywareRemove.com security analysts have strongly advised to take any needed steps to make sure that this Trojan is deleted from their vulnerable machines immediately.

Other Important Notes on TrojanDownloader:Java/Exdoer

In sum, TrojanDownloader:Java/Exdoer can be described as a corrupt Java class that works to exploit this particular vulnerability in the Java runtime environment. Additionally, it is important to note that the patch associated with this Java vulnerability is known to be maliciously utilized by other, additional malware products.

As a Trojan downloader, TrojanDownloader:Java/Exdoer is skilled in dropping malicious products, files and processes onto machines. Once TrojanDownloader:Java/Exdoer has successfully injected a malicious object onto an infected computer, the dropped data is stored in a temporary (i.e. TENP) file location and is provided with a seemingly random label/name of a some executable or another.

To remove this Trojan from any computer successfully, both the threat and its corresponding vulnerability need to be completely removed from the affected system in order to annihilate this Trojan from the system effectively. Both Trojan and vulnerability need to be deleted to ensure that no other security threats will be allowed to exploit the vulnerability.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:

%TEMP%\.exe

File name: %TEMP%\.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\..\..{Subkeys}HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System "DisableTaskMgr" = '1'