Analysis by: Rhena Inocencio
ALIASES:

a variant of Win32/Agent.PAW trojan (ESET), Trojan.Win32.Generic!BT (Sunbelt), Troj/DwnLdr-KKN (Sophos), W32/DERUSBI.AG!tr (Fortinet)

 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: 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 does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size: 57,344 bytes
Memory Resident: Yes
Initial Samples Received Date: 27 Nov 2012
Payload: Steals information, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_WISP.AE

Installation

This backdoor is injected into the following processes running in memory:

  • iexplore.exe
  • firefox.exe
  • outlook.exe

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Perform Remote Shell
  • Enumerate Drives
  • Enumerate Files
  • Start a service
  • Execute files
  • Terminate itself
  • Terminate processes
  • Enumerate Processes
  • Delete files/folders
  • Force Shutdown
  • Force Restart
  • Force Log-off
  • Force Poweroff
  • Upload files
  • Download files

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}fo.{BLOCKED}ccerclub.com:443/archive.asp?id={random number}
  • http://{BLOCKED}fo.{BLOCKED}ccerclub.com:443/tech.asp?id={random number}

Information Theft

This backdoor retrieves the following information from the affected system:

  • Computer name
  • OS Version
  • MAC Address
  • IP address
  • Video driver information

Other Details

This backdoor uploads files to the following website(s):

  • http://{BLOCKED}fo.{BLOCKED}ccerclub.com:443/item.asp?id={random number}

NOTES:

It download files from the following site:

  • http://{BLOCKED}fo.{BLOCKED}soccerclub.com:443/Upload/

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.552.06
FIRST VSAPI PATTERN DATE: 27 Nov 2012
VSAPI OPR PATTERN File: 9.553.00
VSAPI OPR PATTERN Date: 28 Nov 2012

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 the malware/grayware file that dropped/downloaded BKDR_WISP.AF

Step 3

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