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MSE found TrojanDownloader.Java/OpenConnection


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#1 Stan fz6

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Posted 28 December 2011 - 02:16 AM

Hi, to bring you up to speed I was using GMail yesterday and Google warned me about an attempt to access my email from an Ip address in Russia.

After discovering the warning was legitimate i ran Microsoft Security Essentials(among other things) and it found TrojanDownloader.Java/OpenConnection.

MSE proceeded to quarantine and *fix* the problem but I know better. i would appreciate some help in finding out if my computer still has something on or infecting it.

Cheers, Stan

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#2 quietman7

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Posted 28 December 2011 - 10:59 AM

TrojanDownloader:Java/OpenConnection is a detection for an obfuscated Java applet that attempts to download and execute arbitrary files from a remote host.


When a browser runs an applet, the Java Runtime Environment (JRE) stores the downloaded files into its cache folder for quick execution later and better performance. Both legitimate and malicious applets, malicious Java class files are stored in the Java cache directory and your anti-virus may detect them as threats. The detection can indicate the presence of malicious code which could attempt to exploit a vulnerability in the JRE. For more specific information about Java exploits, please refer to Virus found in the Java cache directory.

Notification of these files as a threat does not always mean that a machine has been infected; it indicates that a program included the viral class file but this does not mean that it used the malicious functionality. As a precaution, I recommend clearing the entire cache manually to ensure everything is cleaned out:If you want to perform a more thorough browser clean up, please refer to:
Also be aware that older versions of Java have vulnerabilities that malicious sites can use to exploit and infect your system. That's why it is important to always use the most current Java Version and remove outdated Java components.You can verify (test) your JAVA Software Installation & Version here.

When done with the above, please download Malwarebytes Anti-Malware and save it to your desktop.
  • Important!! When you save the mbam-setup file, rename it to something random (such as 123abc.exe) before beginning the download.
  • Double-click on the renamed file to install, then follow these instructions for doing a Quick Scan in normal mode.
  • Don't forget to check for database definition updates through the program's interface (preferable method) before scanning.
Malwarebytes may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you. Temporarily disable such programs or permit them to allow the changes.
  • After completing the scan, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab .
  • Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows the database version and your operating system.
  • Exit Malwarebytes when done.
If Malwarebytes encounters a file that is difficult to remove, you will be asked to reboot your computer so it can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally will prevent Malwarebytes from removing all the malware.

Note: A 14-day trial of Malwarebytes Anti-Malware PRO is available as an option when first installing the free version so all users can test the real-time protection component for a period of two weeks. When the limited time period expires those features will be deactivated and locked. Enabling the Protection Module feature again requires registration and purchase of a license key that includes free lifetime upgrades and support. If you continue to use the free version, there is no requirement to buy a license...you can just use it as a stand-alone scanner.
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#3 Stan fz6

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Posted 28 December 2011 - 05:00 PM

Thanks you for taking the time to help me I really appreciate it. After clearing my cache on java and Firefox
I reinstalled MBam(already had it) to desktop as requested. here is the log from the Quick Scan
**just making sure it was a quick scan and not full**

Thanks again, Stan.

Malwarebytes Anti-Malware 1.60.0.1800
www.malwarebytes.org

Database version: v2011.12.28.05

Windows Vista Service Pack 2 x64 NTFS
Internet Explorer 8.0.6001.19170
Andy :: ANDY-PC [administrator]

12/28/2011 3:43:29 PM
mbam-log-2011-12-28 (15-43-29).txt

Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 176969
Time elapsed: 4 minute(s), 18 second(s)

Memory Processes Detected: 0
(No malicious items detected)

Memory Modules Detected: 0
(No malicious items detected)

Registry Keys Detected: 0
(No malicious items detected)

Registry Values Detected: 0
(No malicious items detected)

Registry Data Items Detected: 0
(No malicious items detected)

Folders Detected: 0
(No malicious items detected)

Files Detected: 0
(No malicious items detected)

(end)

#4 quietman7

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Posted 28 December 2011 - 05:07 PM

The log looks good. Any more warnings about TrojanDownloader.Java/OpenConnection from MSE?
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#5 Stan fz6

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Posted 28 December 2011 - 05:16 PM

MSE has not found anything else after one full and one quick scan

#6 quietman7

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Posted 28 December 2011 - 05:50 PM

If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been backed up, renamed and saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Posted Image > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Posted Image > Run... and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista and Windows 7 users can refer to these links:
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#7 Stan fz6

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Posted 28 December 2011 - 06:10 PM

I have cleared using restore and now have one restore point, is there anything else you would suggest?

Thanks, Stan

#8 quietman7

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Posted 28 December 2011 - 06:19 PM

You're welcome.

:thumbup2: Tips to protect yourself against malware and reduce the potential for re-infection:

Keep Windows and Internet Explorer current with all security updates from Microsoft which will patch many of the security holes through which attackers can gain access to your computer. When necessary, Microsoft releases security updates on the second Tuesday of each month and publishes Security update bulletins to announce and describe the update. If you're not sure how to install updates, please refer to Updating your computer. Microsoft also recommends Internet 6 and 7 users to upgrade their browsers due to security vulnerabilities which can be exploited by hackers.

Avoid gaming sites, porn sites, pirated software (warez), cracking tools, and keygens. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. In some instances an infection may cause so much damage to your system that recovery is not possible and the only option is to wipe your drive, reformat and reinstall the OS.

Avoid peer-to-peer (P2P) file sharing programs (i.e. Limewire, eMule, Kontiki, BitTorrent, BitComet, uTorrent, BitLord, BearShare). They too are a security risk which can make your computer susceptible to malware infections. File sharing networks are thoroughly infected and infested with malware according to Senior Virus Analyst, Norman ASA. Malicious worms, backdoor Trojans IRCBots, and rootkits spread across P2P file sharing networks, gaming, porn and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and malicious Flash ads that install viruses, Trojans, and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications.
Beware of Rogue Security software as they are one of the most common sources of malware infection. They infect machines by using social engineering and scams to trick a user into spending money to buy a an application which claims to remove malware. For more specific information on how these types of rogue programs install themselves and spread infections, read How Malware Spreads - How did I get infected.

Keeping Autorun enabled on flash drives has become a significant security risk as they are one of the most common infection vectors for malware which can transfer the infection to your computer. One in every eight malware attacks occurs via a USB device. Many security experts recommend you disable Autorun as a method of prevention. Microsoft recommends doing the same.Note: If using Windows 7, be aware that in order to help prevent malware from spreading, the Windows 7 engineering team made important changes and improvements to AutoPlay so that it will no longer support the AutoRun functionality for non-optical removable media.

Always update vulnerable software like browsers, Adobe Reader, Adobe Flash Player and Java Runtime Environment (JRE) with the latest security patches. Older versions of these programs have vulnerabilities that malicious sites can use to exploit and infect your system and vendors regularly issue Security bulletins and advisories.
Use strong passwords and change them anytime you encounter a malware infection, especially if the computer was used for online banking, paying bills, has credit card information or other sensitive data on it. This would include any used for taxes, email, eBay, paypal and other online activities. You should consider them to be compromised and change all passwords immediately as a precaution in case an attacker was able to steal your information when the computer was infected. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control before connecting again.

Don't disable UAC in Vista or Windows 7 and use Limited User Accounts in Windows XP.

• Don't forget to Back up your important data and files on a regular basis. Some infections may render your computer unbootable during or before the disinfection process. Even if you're computer is not infected, backing up is part of best practices in the event of hardware or system failure related to other causes.

• Finally, use common sense, safe computing and safe surfing habits. No amount of security software is going to defend against today's sophisticated malware writers for those who do not practice these principles and stay informed. Knowledge and the ability to use it is the best defensive tool anyone could have.

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