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.
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.
We may as well run SAS as with all that was found ,ley's leave nothing.
Please download and scan with SUPERAntiSpyware Free
- Double-click SUPERAntiSypware.exe and use the default settings for installation.
- An icon will be created on your desktop. Double-click that icon to launch the program.
- If it will not start, go to Start > All Prgrams > SUPERAntiSpyware and click on Alternate Start.
- If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download them from here. Double-click on the hyperlink for Download Installer and save SASDEFINITIONS.EXE to your desktop. Then double-click on SASDEFINITIONS.EXE to install the definitions.)
- In the Main Menu, click the Preferences... button.
- Click the "General and Startup" tab, and under Start-up Options, make sure "Start SUPERAntiSpyware when Windows starts" box is unchecked.
- Click the "Scanning Control" tab, and under Scanner Options, make sure the following are checked (leave all others unchecked):[list]
- Close browsers before scanning.
- Scan for tracking cookies.
- Terminate memory threats before quarantining.
- Click the "Close" button to leave the control center screen and exit the program.
- Do not run a scan just yet.
Reboot your computer in "Safe Mode
" using the F8
method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".Scan with SUPERAntiSpyware as follows:
- Launch the program and back on the main screen, under "Scan for Harmful Software" click Scan your computer.
- On the left, make sure you check C:\Fixed Drive.
- On the right, under "Complete Scan", choose Perform Complete Scan and click "Next".
- After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click "OK".
- Make sure everything has a checkmark next to it and click "Next".
- A notification will appear that "Quarantine and Removal is Complete". Click "OK" and then click the "Finish" button to return to the main menu.
- If asked if you want to reboot, click "Yes" and reboot normally.
- To retrieve the removal information after reboot, launch SUPERAntispyware again.
- Click Preferences, then click the Statistics/Logs tab.
- Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
- If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
- Please copy and paste the Scan Log results in your next reply.
- Click Close to exit the program.
If you have a problem downloading, installing or getting SAS to run, try downloading and using the SUPERAntiSpyware Portable Scanner
instead. Save the randomly named file (i.e. SAS_1710895.COM) to a usb drive or CD and transfer to the infected computer. Then double-click on it to launch and scan. The file is randomly named to help keep malware from blocking the scanner.