Analysis by: Michael Cabel
 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

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It logs a user's keystrokes to steal information.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 43,320 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 22 Feb 2012

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor drops the following copies of itself into the affected system:

  • %System%\winbs2.dll
  • %System%\addon.dat

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Process Termination

This backdoor terminates the following processes if found running in the affected system's memory:

  • ETHEREAL
  • WIRESHARK
  • CPORT
  • ICESWORD
  • TCPVIEW

Information Theft

This backdoor logs a user's keystrokes to steal information.

Other Details

This backdoor requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.794.02
FIRST VSAPI PATTERN DATE: 22 Feb 2012
VSAPI OPR PATTERN File: 8.795.00
VSAPI OPR PATTERN Date: 23 Feb 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

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