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JAVA_DLOADR.USR

February 16, 2013
 Analysis by: Jaime Benigno Reyes
 ALIASES:

Exploit:Java/CVE-2013-0422 (Microsoft), a variant of Java/Exploit.CVE-2013-0422.BF trojan (Nod32), Java.Exploit.CVE-2013-0422.B (BitDefender), Java/MBean.gen!exploit.CVE20130422 (Fortinet), Java.Exploit.CVE-2013 (Ikarus)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

It downloads a file from a certain URL then renames it before storing it in the affected system. It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

Varies

Initial Samples Received Date:

14 Feb 2013

Payload:

Downloads files

Arrival Details

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

Download Routine

This Trojan downloads files from the following URLs then renames them before storage in the affected system:

  • http://{BLOCKED}res.com.br/p.gif

It takes advantage of the following software vulnerabilities to download possibly malicious files:

It saves the files it downloads using the following names:

  • %All Users' Profile%\ph3d3r4.exe - TROJ_BUBLIK.KA

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It downloads a possibly malicious file from a certain URL. The URL where this malware downloads the said file depends on the following parameter(s) passed on to it by its components:

  • link

NOTES:

This malware accesses another URL which is determined by the parameter link, passed on to it by its component. The downloaded file is then saved as %All Users' Profile%\jupdate.{variable}, where {variable} is determined by the parameterlink.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.726.01

FIRST VSAPI PATTERN DATE:

14 Feb 2013

VSAPI OPR PATTERN File:

9.727.00

VSAPI OPR PATTERN Date:

15 Feb 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by JAVA_DLOADR.USR

    • TROJ_BUBLIK.KA

Step 3

Close all opened browser windows

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %All Users' Profile%\jupdate.{variable}

Step 5

Scan your computer with your Trend Micro product to delete files detected as JAVA_DLOADR.USR. 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 6

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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