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TROJ_AGENT.BNOY

October 08, 2012
 Analysis by: JasperM
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan arrives as a file that exports the functions of other malware/grayware. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, due to errors in its code, it fails to perform its intended routine.

  TECHNICAL DETAILS

File Size:

75,776 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

01 Sep 2010

Arrival Details

This Trojan arrives as a file that exports the functions of other malware/grayware.

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

Other Details

Based on analysis of the codes, it has the following capabilities:

  • This malware is automatically executed by a scheduled task that may be created by other malware.
  • The scheduled task runs this malware by executing an export function named 'zhsmpexi'. However, this malware does not have this export function preventing it to perform its routines.
  • This file has an encrypted executable file which it decrypts. This file may be used in its routines but the embedded file does not have malicious routines by itself.

However, due to errors in its code, it fails to perform its intended routine.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.429.80

VSAPI PATTERN Date:

01 Sep 2010

VSAPI PATTERN Date:

9/1/2010 12:00:00 AM

Step 1

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.BNOY. 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 2

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.


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