Analysis by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This malware is associated with a spammed fake Facebook friend confirmation.

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

This Trojan takes advantage of certain software vulnerabilities to download possibly malicious files.

As of this writing, it downloads and executes files which are detected TSPY_ZBOT.PEJ. As a result, malicious routines of the downloaded files are also exhibited on the affected system.

  TECHNICAL DETAILS

File Size: Varies
File Type: JAR, Java Class
Initial Samples Received Date: 25 Apr 2012
Payload: Downloads files

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://{BLOCKED}.{BLOCKED}.172.153/Edu.jar
  • http://{BLOCKED}.{BLOCKED}.229.55/Edu.jar

Download Routine

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

NOTES:

As of this writing, it downloads and executes the following files which are detected as TSPY_ZBOT.PEJ:

  • http://{BLOCKED}tec.sk/D8aoPu86/XPVqAGE.exe
  • http://{BLOCKED}erge.com/aXS0mRNT/KXj.exe
  • http://{BLOCKED}rforhire.com.au/CWWrvcPe/nxp62Wk.exe

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

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.942.03
FIRST VSAPI PATTERN DATE: 26 Apr 2012
VSAPI OPR PATTERN File: 8.943.00
VSAPI OPR PATTERN Date: 26 Apr 2012

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

Remove malware files dropped/downloaded by JAVA_AGENT.PEJ

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_AGENT.PEJ. 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 these security patches 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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