BKDR_XYLIGAN.Q

October 08, 2012
 Analysis by: JasperM
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

180,224 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

01 Aug 2010

Arrival Details

This backdoor may be dropped by other malware.

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

Installation

This backdoor drops the following copies of itself into the affected system:

  • %System%\tgvbgq.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This backdoor 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\
Services\rcmdsdsvc
Type = 10

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\rcmdsdsvc
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\rcmdsdsvc
ImagePath = %System%\tgvbgq.exe

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\rcmdsdsvc
DisplayName = Remote Command Service

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\rcmdsdsvc
Description = Windows Resource Kit

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.684.04

FIRST VSAPI PATTERN DATE:

10 Dec 2009

VSAPI OPR PATTERN File:

7.357.00

VSAPI OPR PATTERN Date:

02 Aug 2010

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 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.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • rcmdsdsvc

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_XYLIGAN.Q. 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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