Analysis by: Kathleen Notario
 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 Trojan as noteworthy due to the increased potential for damage, propagation, or both, that it possesses.

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 executes downloaded files whose malicious routines are exhibited by the affected system.

  TECHNICAL DETAILS

File Size: Varies
File Type: Script
Memory Resident: No
Initial Samples Received Date: 15 Jun 2010
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

Dropping Routine

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

  • Microsoft Microsoft Windows Help and Support Center

Download Routine

After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:

  • http://php.{BLOCKED}urcecms.com/include/23.php

It saves the files it downloads using the following names:

  • %User Temp%\1.js - detected as JS_HCPDL.A

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It executes downloaded files :

    whose malicious routines are exhibited by the affected system.

    Other Details

    This Trojan connects to the following possibly malicious URL:

    • hcp://{BLOCKED}es/search?query=anything&topic=hcp://system/sysinfo/sysinfomain.htm
    • hcp://{BLOCKED}es/search?query=a&topic=hcp://system/sysinfo/sysinfomain.htm

    More information on this vulnerability can be found below:

      SOLUTION

    Minimum Scan Engine: 8.900
    FIRST VSAPI PATTERN FILE: 7.244.18
    FIRST VSAPI PATTERN DATE: 15 Jun 2010
    VSAPI OPR PATTERN File: 7.245.00
    VSAPI OPR PATTERN Date: 16 Jun 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

    Remove malware files dropped/downloaded by TROJ_HCPEXP.A

    Step 3

    Close all opened browser windows

    Step 4

    Scan your computer with your Trend Micro product to delete files detected as TROJ_HCPEXP.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.


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