Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

The sent messages contains a link where a copy of the malware may be downloaded.

  TECHNICAL DETAILS

File Size: 147,456 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 05 Nov 2010

Installation

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

  • %Windows%\winudpmgr.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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Windows UDP Control Center = winudpmgr.exe

Propagation

The sent messages contain the following link(s), where a copy of the malware may be downloaded:

  • http://{BLOCKED}l.com/33cfa5l

It sends the following messages via instant-messaging (IM) applications:

EsTa Photo So Tuos?

It sends copies of itself to target recipients using the following instant-messaging (IM) applications:

  • AIM
  • MSN
  • TIM

Backdoor Routine

This worm connects to any of the following IRC server(s):

  • {BLOCKED}i.com

It joins any of the following IRC channel(s):

  • #!NN!#

  SOLUTION

Minimum Scan Engine: 8.900

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 WORM_IRCBOT.AAK

[ 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
    • Windows UDP Control Center = winudpmgr.exe

Step 4

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