Posted: January 11, 2013
Threat Metric
Threat Level: 7/10
Infected PCs 62

Mal/JavaJar-B Description

Mal/JavaJar-B is a Java archive that uses a recently-identified Java exploit to attack vulnerable computers and, in most cases, install malicious software. Although Mal/JavaJar-B is a very new PC threat, Mal/JavaJar-B already has been incorporated into several exploit kits, including the Cool EK and the NuclearPack Exploit Kit. Attacks by Mal/JavaJar-B are likely to show no symptoms and will launch after unprotected exposure to malicious or compromised websites. malware researchers can recommend no better course of action than to keep anti-malware security aboard to block Mal/JavaJar-B-related attacks as they appear and, if necessary, to remove Mal/JavaJar-B's payload from your PC. However, for sufficiently paranoid PC users, Java-eschewing security options also may be on the table – at least until a patch has been issued to correct Mal/JavaJar-B's vulnerability.

Mal/JavaJar-B: the Invisible Security Problem with Your Friendly Web Content

Java, JavaScript and other website-friendly content platforms often are abused for the sake of drive-by-downloads and related browser attacks, and Mal/JavaJar-B is just one of the most recent examples of how such PC threats take forms that can't be thwarted just by patching your software. Using a zero-day vulnerability that has been identified but not corrected by Java's coding team, Mal/JavaJar-B will attack any vulnerable PC that allows Java to run automatically on their web browser.

Disabling or even deleting Java can be used as a definitive means of protecting your PC from Mal/JavaJar-B. In cases where this isn't practical (due to Mal/JavaJar-B's widespread use as a content delivery platform), malware experts suggest that you use strong anti-malware and browser-based security features that can, hopefully, detect and block activity that's related to Mal/JavaJar-B.

In normal scenarios, Mal/JavaJar-B is just one of several potential exploits that are loaded by a website-hosted exploit kit package that attempts to detect the software vulnerabilities of your PC. Visiting a hostile or hacked site with an unprotected computer is all that's necessary to be targeted by Mal/JavaJar-B and related attacks, which usually will install malicious software (via drive-by-download attacks) without any obvious symptoms of the action.

All major browsers and versions of Windows can be considered in danger from such attacks. However, malware researchers also have seen a minority of similar PC threats that target alternative systems (like Linux and Mac).

The Risks that You Play with When You Allow Mal/JavaJar-B Into Your PC

Like similar software vulnerabilities, Mal/JavaJar-B doesn't have any hard limits on the type of malware that Mal/JavaJar-B can be used to install. However, malware researchers have taken note of some of the most likely PC threats to benefit from Mal/JavaJar-B, according to the recent attack patterns from the latest malware-distributing campaigns:

  • Ransomware Trojans that alter their fake pop-up alerts to conform to the details of your IP address's associated country, block you from using other programs and request that you pay an (illegal) online or voucher-based fine.
  • Banking Trojans and similar spyware-based Trojans that use concealed attacks to steal personal information. Bank account credentials and other account-based login data are favored targets.
  • Trojans with adverse effects on your computer's security, such as disabling security features, blocking security-related programs or redirecting you away from PC security websites.

In all cases, malware experts recommend that you scan your PC with suitable anti-malware products as soon as possible after any suspected contact with Mal/JavaJar-B.

Use SpyHunter to Detect and Remove PC Threats

If you are concerned that malware or PC threats similar to Mal/JavaJar-B may have infected your computer, we recommend you start an in-depth system scan with SpyHunter. SpyHunter is an advanced malware protection and remediation application that offers subscribers a comprehensive method for protecting PCs from malware, in addition to providing one-on-one technical support service.

Download SpyHunter's Malware Scanner

Note: SpyHunter's free version is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware tool to remove the malware threats. Learn more on SpyHunter. If you would like to uninstall SpyHunter for any reason, please follow these uninstall instructions. To learn more about our policies and practices, visit our EULA, Privacy Policy and Threat Assessment Criteria.

Why can't I open any program including SpyHunter? You may have a malware file running in memory that kills any programs that you try to launch on your PC. Tip: Download SpyHunter from a clean computer, copy it to a USB thumb drive, DVD or CD, then install it on the infected PC and run SpyHunter's malware scanner.

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:

1ace845d-3e2a5bcc File name: 1ace845d-3e2a5bcc
Size: 3.51 KB (3511 bytes)
MD5: f94dbab99eaabb8a70806322c1eca656
Detection count: 49
Group: Malware file
Last Updated: January 15, 2013
jimmdemy.jar File name: jimmdemy.jar
Size: 9.46 KB (9465 bytes)
MD5: be2bcd6c3f2aee6432358e1fb37a8dc2
Detection count: 48
Mime Type: unknown/jar
Group: Malware file
Last Updated: January 15, 2013
jar_cache53600.tmp File name: jar_cache53600.tmp
Size: 9.29 KB (9290 bytes)
MD5: 69cbc609f3f2f2828a9cfb3d0c02f0b2
Detection count: 41
File type: Temporary File
Mime Type: unknown/tmp
Group: Malware file
Last Updated: January 15, 2013
Home Malware Programs Malware Mal/JavaJar-B

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