Modified by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This backdoor may be dropped by other malware.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 24,064 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 10 Apr 2012
Payload: Compromises system security, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_PIDIEF.DRP

Installation

This backdoor drops the following files:

  • %Windows%\tasks\fxsst.dll - backdoor component also detected as BKDR_CHALCOL.BC
  • %User Startup%\AcroRd32.exe - autostart component also detected as BKDR_CHALCOL.BC

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

It injects itself into the following processes as part of its memory residency routine:

  • explorer.exe

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.202.198/jp/log2.asp

NOTES:

It reports successful infection to its C&C server by sending the following information via HTTP GET:

  • Host name
  • IP address
  • Malware Flag
  • Operating system
  • Proxy information
  • Virtual Machine

It is capable of executing the following commands:

  • Download and execute file(s)
  • Open an instance of cmd.exe process
  • Update itself

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.900.05
FIRST VSAPI PATTERN DATE: 10 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 BKDR_CHALCOL.BC

     TROJ_PIDIEF.DRP

Step 3

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_CHALCOL.BC. 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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