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TROJ_ZAPCHAST.BJ

October 09, 2012
 Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan arrives as a component bundled with malware/grayware packages.

  TECHNICAL DETAILS

File Size:

8,192 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Sep 2011

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

NOTES:

This file may be a component of another malware. It accepts a process ID (integer) as parameter and does not continue with its routines until the monitored process is terminated. It creates the following registry entry to serve as counter:

HKEY_LOCAL_MACHINE\SYSTEM\Wpa
brk3 = {number}

The value in the above registry is incremented every time the file executes.

It also creates the following registry where the infection date and time is recorded:

HKEY_LOCAL_MACHINE\SYSTEM\Wpa
brkIt = brk_{date}_{time}

It restarts the machine afterwards.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.436.03

FIRST VSAPI PATTERN DATE:

18 Sep 2011

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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\Wpa
    • brk3 = {number}
  • In HKEY_LOCAL_MACHINE\SYSTEM\Wpa
    • brkIt = brk_{date}_{time}

Step 3

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