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JAVA_WEBSTART.A

April 16, 2010
 Analysis by: JocelynR
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


Trend Micro has flagged this as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, it exploits the recently discovered Java Vulnerability to allow an attacker to run commands on the affected system.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may be hosted on a website and run when a user accesses the said website.

It takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

3.510 bytes

File Type:

Java Class

Memory Resident:

Yes

Initial Samples Received Date:

15 Apr 2010

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

Download Routine

This Trojan takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware to download files:

    As of this writing, the said sites are inaccessible.

    Other Details

    Based on analysis of the codes, it has the following capabilities:

    • Checks if it is running in a Microsoft Windows Operating Sytem
    • Attempts to download a file
    • Connects to http://www.{BLOCKED}ancomcareers.com/vasek where JAVA_WEBSTART.A is hosted

      SOLUTION

    Minimum Scan Engine:

    8.900

    FIRST VSAPI PATTERN FILE:

    7.105.00

    FIRST VSAPI PATTERN DATE:

    17 Apr 2010

    VSAPI OPR PATTERN File:

    7.105.00

    VSAPI OPR PATTERN Date:

    17 Apr 2010

    Step 1

    For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

    Step 2

    Close all opened browser windows

    Step 3

    Remove malware files dropped/downloaded by JAVA_WEBSTART.A

      JS_WEBSTART.A

    Step 4

    Scan your computer with your Trend Micro product to delete files detected as JAVA_WEBSTART.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

    Step 5

    Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.  


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