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RTKT_ZACCESS.KBF

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

Windows 7 64-bit, Windows Vista 64-bit

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan the 64-bit version of ZACCESS rootkit. It attempts to bypass Windows UAC (User Account Control) by creating an instance of a legitimate explorer.exe and injecting its code into the said process. Once running, it downloads and executes its component from a randomly generated domain.

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

45,056 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Nov 2011

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan injects codes into the following process(es):

  • Explorer.exe

NOTES:

This is the 64-bit version of ZACCESS rootkit. It attempts to bypass Windows UAC (User Account Control) by creating an instance of a legitimate explorer.exe and injecting its code into the said process. Once running, it downloads and executes its component from a randomly generated domain with the following format:

  • {domain}/stat2.php?w={number}&i={string}&a=13

As a result, the routines of the downloaded component are also exhibited in the system.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.568.02

FIRST VSAPI PATTERN DATE:

12 Nov 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

Scan your computer with your Trend Micro product and note files detected as RTKT_ZACCESS.KBF

Step 3

Identify and delete files detected as RTKT_ZACCESS.KBF using the Recovery Console

[ Learn More ]

Step 4

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