TROJ_ZACCESS.CQJ

August 03, 2012
 Analysis by: Roland Marco Dela Paz
 Modified by: Kathleen Notario
 ALIASES:

Troj/ZAccess-AH (Sophos); Trojan.Sirefef.BV (F-Secure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003, Windows 7

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

It is a .DLL component of the BKDR_ZACCESS malware family. It exports functions used by its mother malware.

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

5,632 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

15 Feb 2012

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be dropped by other malware.

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
{malware filename}
ImagePath = "{malware path and filename}"

NOTES:

It is a .DLL component of the BKDR_ZACCESS malware family. It exports functions used by its mother malware.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.778.04

FIRST VSAPI PATTERN DATE:

16 Feb 2012

VSAPI OPR PATTERN File:

8.779.00

VSAPI OPR PATTERN Date:

16 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 and note files detected as TROJ_ZACCESS.CQJ

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ 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.


Step 5

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