Analysis by: Christopher Daniel So
 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

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

It does not have any downloading capability.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: 11,776 bytes
File Type: SYS
Memory Resident: Yes
Initial Samples Received Date: 06 Mar 2009

Arrival Details

This Trojan may be dropped by other malware.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

NOTES:

This is the Trend Micro detection for drivers, which hook certain Native API functions to hide files and processes.

It hooks the Native API functions ZwOpenProcess, ZwQueryDirectoryFile and ZwQuerySystemInformation to hide processes and files with a specific file name. The processes and file name to hide come from processes that use this driver.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 9.121.00
VSAPI OPR PATTERN Date: 19 May 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 RTKT_DELF.JXZ

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as RTKT_DELF.JXZ

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

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