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WORM_IRCBOT.BEC

October 08, 2012
 Analysis by: jont
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This worm arrives by connecting affected removable drives to a system.

It drops copies of itself into all the removable drives connected to an affected system. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size:

271,872 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

01 Dec 2010

Payload:

Drops files

Arrival Details

This worm arrives by connecting affected removable drives to a system.

Installation

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

  • %Windows%\Sysdiag64.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
sysdiag64.exe = "%Windows%\sysdiag64.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
MicrosoftCorp = "%Windows%\sysdiag64.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
MicrosoftNAPC = "%Windows%\sysdiag64.exe"

Propagation

This worm creates the following folders in all removable drives:

  • cold\hott

It drops copies of itself into all the removable drives connected to an affected system.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

autorun]
[autorun[
[autorun]
open=cold\hott\sysdiag64.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Openáfolderátoáview files
UseAuTOPLAY=1
shell\open\command=cold\hott\sysdiag64.exe
shell\Explore\Command=cold\hott\sysdiag64.exe

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.666.01

VSAPI PATTERN Date:

01 Dec 2010

VSAPI PATTERN Date:

12/1/2010 12:00:00 AM

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

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • sysdiag64.exe = %Windows%\sysdiag64.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • MicrosoftCorp = %Windows%\sysdiag64.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • MicrosoftNAPC = %Windows%\sysdiag64.exe

Step 4

Search and delete AUTORUN.INF files created by WORM_IRCBOT.BEC that contain these strings

[ Learn More ]
 autorun]
[autorun[
[autorun]
open=cold\hott\sysdiag64.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Openáfolderátoáview files
UseAuTOPLAY=1
shell\open\command=cold\hott\sysdiag64.exe
shell\Explore\Command=cold\hott\sysdiag64.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_IRCBOT.BEC. 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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