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OSX/exploit.smid.c.trojan


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#1 Xerces

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Posted 18 October 2010 - 06:38 PM

AVG found this trojan a few days ago, i deleted it from my laptop but now firefox is taking ages to load pages and my pc is using more resorces even when nothing is running. Please help me check and remove anything left.

Im using windows 7 home edition

Thanks

Edited by Xerces, 18 October 2010 - 06:49 PM.


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#2 quietman7

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Posted 18 October 2010 - 09:42 PM

Exploit.OSX.Smid.c is the name given by Kaspersky for Java.ByteVerify which is a method to exploit a security vulnerability in the Microsoft Virtual Machine that is stored in the java cache as a java-applet. The vulnerability arises as the ByteCode verifier in the Microsoft VM does not correctly check for the presence of certain malformed code when a java-applet is loaded. Attackers can exploit the vulnerability by creating malicious Java applets and inserting them into web pages that could be hosted on a web site or sent to users as an attachment. Trojan Exploit ByteVerify indicates that a Java applet - a malicious Java archive file (JAR) - was found on your system containing the exploit code.

When a browser runs an applet, the Java Runtime Environment (JRE) stores the downloaded files into its cache folder (C:\Documents and Settings\username\Application Data\Sun\Java\Deployment\cache) for quick execution later and better performance. Malicious applets are also stored in the Java cache directory and your anti-virus may detect them and provide alerts. 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.

These malicious applets are designed to exploit vulnerabilities in the Microsoft VM (Microsoft Security Bulletin MS03-011). If you are using the Sun JVM as your default virtual machine, these malicious applets cannot cause any harm to your computer. See: here.

A number of anti-virus programs (AVG, avast, CA, Kaspersky, Symantec) and scanners will detect Java/ByteVerify (Exploit.OSX.Smid.c, Java:Djewers) but they cannot remove the applets. If you have the Java-Plugin installed, then deleting them from the Java cache should eliminate the problem. The Java Plug-In in the Control Panel is only present if you are using Sun's Java. If you don't have the Java-Plugin installed then just delete the files manually. The Microsoft Virtual machine stores the applets in the Temporary Internet Files.

Recommended Solution:Alternatively, you can download and use TFC (Temp File Cleaner) by Old Timer.
alternate download link
  • Save any unsaved work. TFC will close ALL open programs including your browser!
  • Double-click on TFC.exe to run it. Vista/Windows 7 users right-click and select Run As Administrator.
  • Click the Start button to begin the cleaning process and let it run uninterrupted to completion.
  • TFC will clear out all temp folders (temp, IE temp, Java, FF, Opera, Chrome, Safari) for all user accounts, including Administrator, All Users, LocalService, NetworkService, and any other accounts in the user folder.
  • Important! If TFC prompts you to reboot, please do so immediately. If not prompted, manually reboot the machine anyway to ensure a complete clean. Note: It is normal for the computer to be slow to boot after running TFC cleaner the first time.
Then perform a scan with Malwarebytes Anti-Malware and follow these instructions for doing a Quick Scan in normal mode.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply and exit MBAM.
-- If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware. MBAM 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.

-- Some types of malware will target Malwarebytes Anti-Malware and other security tools to keep them from running properly. If that's the case, please refer to the suggestions provided in For those having trouble running Malwarebytes Anti-Malware as you may need to rename it or use RKill by Grinler.

Edited by quietman7, 18 October 2010 - 09:48 PM.

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#3 Xerces

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Posted 20 October 2010 - 11:12 AM

Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Database version: 4883

Windows 6.1.7600
Internet Explorer 8.0.7600.16385

19/10/2010 22:21:21
mbam-log-2010-10-19 (22-21-21).txt

Scan type: Full scan (C:\|F:\|)
Objects scanned: 274844
Time elapsed: 43 minute(s), 31 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)
Ok, i done those things you suggested, here is my mbam log:


Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

Firefox seems to be working again now, so I think that issue is solved, but let me know if theres is anything else to do

Thanks for you time :thumbsup:

#4 quietman7

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Posted 20 October 2010 - 11:22 AM

You're welcome.

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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#5 Xerces

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Posted 20 October 2010 - 12:01 PM

Hi, there is no option to create a new restore point, only to go back to a previous one- either recommended by windows or pick myself, and theres no option to crate a new restore point there either. Im running windows 7 home so is there another way of crating a restore point?

#6 quietman7

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Posted 20 October 2010 - 12:13 PM

Are these instructions incorrect?
Create a Restore Point for Windows 7 or Vista’s System Restore

Also see How to Create a System Restore Point in Windows 7
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#7 Xerces

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Posted 20 October 2010 - 12:23 PM

That worked, thanks again for your help :thumbsup:

#8 quietman7

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Posted 20 October 2010 - 12:38 PM

You're welcome.

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

Keep Windows and Internet Explorer current with all critical updates from Microsoft which will patch many of the security holes through which attackers can gain access to your computer. If you're not sure how to do this, see Microsoft Update helps keep your computer current.

Avoid gaming sites, porn sites, pirated software, cracking tools, keygens, and peer-to-peer (P2P) file sharing programs (i.e. Limewire, eMule, uTorrent). 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. 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. Porn sites can lead to the Trojan.Mebroot MBR rootkit and other dangerous malware. 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 USB (pen, thumb, jump) and other removable 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. To learn more about this risk, please read:Many security experts recommend you disable Autorun as a method of prevention. Microsoft recommends doing the same.

...Disabling Autorun functionality can help protect customers from attack vectors that involve the execution of arbitrary code by Autorun when inserting a CD-ROM device, USB device, network shares, or other media containing a file system with an Autorun.inf file...

Microsoft Security Advisory (967940): Update for Windows Autorun
How to Maximize the Malware Protection of Your Removable Drives

Change all passwords: Anytime you encounter a malware infection on your computer, especially if that computer was used for online banking, has credit card information or other sensitive data on it, all passwords should be changed immediately to include those used for banking, email, eBay, paypal and any online activities which require a username and password. You should consider them to be compromised and change passwords 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.

Security Resources from Microsoft:Other Security Resources:Browser Security Resources:Finally, if you need to replace your anti-virus, firewall or need a reliable anti-malware scanner please refer to:

Edited by quietman7, 20 October 2010 - 12:40 PM.

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