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BKDR_QUEJOB.EVL
Malware type: Backdoor
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
Encrypted: No
In the wild: Yes

Overview


This backdoor is noteworthy as it poses as an installer of Facebook messenger.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Technical Details


Ports used: TCP port 1098 (RMI Activation)
File size: 45,568 bytes
File type: EXE
Memory resident: Yes
Initial samples received date: 15 Apr 2011

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This backdoor drops the following non-malicious file:

  • %Application Data%\common.data

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
AutoStart = "{malware path and file name}.exe"

NOTES:

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • TCP Port 1098

It executes the following commands from a remote malicious user:

  • Update itself
  • Download and execute files
  • Start a process

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.216.50

Other Details

This backdoor queries if antivirus products are installed on the infected system. The result is then sent to the following SMTP server via email:

  • smtp.{BLOCKED}il.ru

It also checks the OS version used by the infected system. It then sends the gathered information to the remote server.

This backdoor poses as an installer of Facebook messenger.

Solution


Minimum scan engine: 8.900
First VSAPI Pattern File: 7.982.05
First VSAPI Pattern Release Date: 18 Apr 2011
VSAPI OPR Pattern Version: 7.983.00
VSAPI OPR Pattern Release Date: 18 Apr 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

Terminate a process file/s detected as BKDR_QUEJOB.EVL

[ Learn more ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.


Step 3

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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • AutoStart = "{malware path and file name}.exe"

Step 4

Search and delete this file

[ Learn more ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %Application Data%\common.data

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_QUEJOB.EVL. 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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Analysis By: Michael Cabel

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